原本今天打算继续写ASP.NET MVC第四天的。但是由于里面涉及到asp.net运行机制的原理，如果不分析一下这里，mvc想说清楚还是挺困难的。既然要提到asp.net运行机制，所以打算还是说详细一点的好。记录mvc第一天的时候就说过，asp.net mvc也是基于asp.net运行机制的（也就是原理）。网上也有很多讲解asp.net运行机制的，我在这里说一下自己的认识，我们开始吧。
我们从web程序的入口开始。那就要先说到iis了，大家都知道，这是web服务软件。将web程序部署到iis过的人都知道，如果不做任何处理，我们写的webform是不能运行的。为什么非要执行aspnet_regiis才可以呢？我们看一下电脑路径C:\Windows\Microsoft.NET\Framework\v4.0.30319，aspnet_regiis.exe就在这里路径下。我们简单说一下原因，看下iis的历史，在百度上没有查到iis软件发布的年限，但至少iis在windows 2000的时候就存在了，而我们的.net framework在2002-02-13的时候才发布1.0版本，是啊，我们都知道微软很厉害，但就是在厉害他也不会强大到可以预测几年后的软件运行机制吧。也就是说iis对.net framework还说就是个“古董”,他不可能会知道.net framewrok运行机制，更不可能知道asp.net的运行机制。早起的iis也只能处理静态页面，也就类似于html，js，图片之类的东西。但现在如果我们想将asp.net 程序部署到iis上怎么办呢？对，扩展，使用扩展程序，我们运行aspnet_regiis.exe也就是将扩展程序（aspnet_isapi）注入到iis中，这样iis就可以处理了？---------哈哈，iis还是处理处理不了asp.net程序，但是后注入的程序可以告诉iis，我扩展程序可以处理什么样的程序，你如果处理不了，可以尝试交给我处理。
看一下上面说到的路经下面有个aspnet_isapi.dll，我们只是简单的说一下这里，这个dll是使用c/c++写的，并不是c#写的，所以我们无法反编译成c#代码。这是个承上启下的动态库，因为c/c++并不是我们考虑的范围内，我们直接认为这个程序将请求交给我们“在乎”的程序，下面我们开始反编译我们“在乎”程序。反编译工具中查找ISAPIRuntime这个类，下面是我反编译出来的结果这个类是system.web程序集下的类
1 public sealed class ISAPIRuntime : MarshalByRefObject, IISAPIRuntime, IISAPIRuntime2, IRegisteredObject 2 { 3 // Fields 4 private static int _isThisAppDomainRemovedFromUnmanagedTable; 5 private const int WORKER_REQUEST_TYPE_IN_PROC = 0; 6 private const int WORKER_REQUEST_TYPE_IN_PROC_VERSION_2 = 2; 7 private const int WORKER_REQUEST_TYPE_OOP = 1; 8 9 // Methods 10 [SecurityPermission(SecurityAction.Demand, Unrestricted=true)] 11 public ISAPIRuntime(); 12 [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)] 13 public void DoGCCollect(); 14 public override object InitializeLifetimeService(); 15 [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)] 16 public int ProcessRequest(IntPtr ecb, int iWRType); 17 internal static void RemoveThisAppDomainFromUnmanagedTable(); 18 [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)] 19 public void StartProcessing(); 20 [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)] 21 public void StopProcessing(); 22 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 23 void IISAPIRuntime2.DoGCCollect(); 24 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 25 int IISAPIRuntime2.ProcessRequest(IntPtr ecb, int iWRType); 26 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 27 void IISAPIRuntime2.StartProcessing(); 28 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 29 void IISAPIRuntime2.StopProcessing(); 30 void IRegisteredObject.Stop(bool immediate); 31 } 32 33 34 Expand Methods 35
其实我贴出代码没有别的意思，就是想用事实说话，过多的内容我们不看，我们只看里面的public int ProcessRequest(IntPtr ecb, int iWRType)处理请求方法。我们先看一下参数类型吧，IntPtr？有调c/c++动态库的人会知道这是c/c++里面指针类型，我们不用过多的考虑。我自己分析的，不知道对不对，正因为这是IntPtr，所以该类应该是调用了c/c++相关的动态库了，不然这里也没有必要用到。这样流程就出来了，IIS——》aspnet_isapi（c/c++相关动态库）——》ISAPIRuntime类；需要提到一点的是，IntPtr是个指针，指针会指向一块内存区域，可能很大，也可能很小。我认为请求的内容放在了这块区域中，从这里面可以获取到浏览器请求头的内容下面是ProcessRequest方法的内容
1 [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)] 2 public int ProcessRequest(IntPtr ecb, int iWRType) 3 { 4 IntPtr zero = IntPtr.Zero; 5 if (iWRType == 2) 6 { 7 zero = ecb; 8 ecb = UnsafeNativeMethods.GetEcb(zero); 9 } 10 ISAPIWorkerRequest wr = null; 11 try 12 { 13 bool useOOP = iWRType == 1; 14 wr = ISAPIWorkerRequest.CreateWorkerRequest(ecb, useOOP); 15 wr.Initialize(); 16 string appPathTranslated = wr.GetAppPathTranslated(); 17 string appDomainAppPathInternal = HttpRuntime.AppDomainAppPathInternal; 18 if ((appDomainAppPathInternal == null) || StringUtil.EqualsIgnoreCase(appPathTranslated, appDomainAppPathInternal)) 19 { 20 HttpRuntime.ProcessRequestNoDemand(wr); 21 return 0; 22 } 23 HttpRuntime.ShutdownAppDomain(ApplicationShutdownReason.PhysicalApplicationPathChanged, SR.GetString("Hosting_Phys_Path_Changed", new object[] { appDomainAppPathInternal, appPathTranslated })); 24 return 1; 25 } 26 catch (Exception exception) 27 { 28 try 29 { 30 WebBaseEvent.RaiseRuntimeError(exception, this); 31 } 32 catch 33 { 34 } 35 if ((wr == null) || !(wr.Ecb == IntPtr.Zero)) 36 { 37 throw; 38 } 39 if (zero != IntPtr.Zero) 40 { 41 UnsafeNativeMethods.SetDoneWithSessionCalled(zero); 42 } 43 if (exception is ThreadAbortException) 44 { 45 Thread.ResetAbort(); 46 } 47 return 0; 48 } 49 } 50 51 52 53
下面我们来分析一下这里面的代码，我们只分析重要的部分。
这里新建了一个 ISAPIWorkerRequest wr = null;类，进行创建封装该对象，wr = ISAPIWorkerRequest.CreateWorkerRequest(ecb, useOOP);上面说了ecb是个指针，里面可以存储很多请求内容的。紧接着对wr进行初始化wr.Initialize();我们着重看HttpRuntime.ProcessRequestNoDemand(wr);注意这里使用的是HttpRuntime，一会我们还会分析该类，现在我们进入ProcessRequestNoDemand方法里面看看。这里面应该是关于多线程模型了
1 internal static void ProcessRequestNoDemand(HttpWorkerRequest wr) 2 { 3 RequestQueue queue = _theRuntime._requestQueue; 4 wr.UpdateInitialCounters(); 5 if (queue != null) 6 { 7 wr = queue.GetRequestToExecute(wr); 8 } 9 if (wr != null) 10 { 11 CalculateWaitTimeAndUpdatePerfCounter(wr); 12 wr.ResetStartTime(); 13 ProcessRequestNow(wr); 14 } 15 } 16 17 18 19
这时ISAPIRuntime已经将请求交给HttpRuntime类了，HttpRuntime类调用RequestQueue queue = _theRuntime._requestQueue;该类试图获取请求处理队列，我们可以简单的认为服务器在求情一个线程来处理该次浏览器的请求。wr = queue.GetRequestToExecute(wr);我们进入到GetRequestToExecute方法，
1 internal HttpWorkerRequest GetRequestToExecute(HttpWorkerRequest wr) 2 { 3 int num; 4 int num2; 5 int num3; 6 ThreadPool.GetAvailableThreads(out num, out num2); 7 if (this._iis6) 8 { 9 num3 = num; 10 } 11 else 12 { 13 num3 = (num2 > num) ? num : num2; 14 } 15 if ((num3 < this._minExternFreeThreads) || (this._count != 0)) 16 { 17 bool isLocal = IsLocal(wr); 18 if ((isLocal && (num3 >= this._minLocalFreeThreads)) && (this._count == 0)) 19 { 20 return wr; 21 } 22 if (this._count >= this._queueLimit) 23 { 24 HttpRuntime.RejectRequestNow(wr, false); 25 return null; 26 } 27 this.QueueRequest(wr, isLocal); 28 if (num3 >= this._minExternFreeThreads) 29 { 30 wr = this.DequeueRequest(false); 31 return wr; 32 } 33 if (num3 >= this._minLocalFreeThreads) 34 { 35 wr = this.DequeueRequest(true); 36 return wr; 37 } 38 wr = null; 39 this.ScheduleMoreWorkIfNeeded(); 40 } 41 return wr; 42 } 43 44 45 46
当然服务器不可能只有一个求情，如果同时有多个用户请求，这时队列中就可能没有线程可响应此次请求，在这里面就会调用this.ScheduleMoreWorkIfNeeded();从线程池中拿出一个来处理请求。下面我们返回ProcessRequestNoDemand（）方法，该方法调用了ProcessRequestNow(wr);处理请求。
1 internal static void ProcessRequestNow(HttpWorkerRequest wr) 2 { 3 _theRuntime.ProcessRequestInternal(wr); 4 } 5 6
我们只看ProcessRequestNow（）方法
这个方法又调用了HttpRuntime的ProcessRequestInternal方法，接下来我们开始分析HttpRuntme类，
1 public sealed class HttpRuntime 2 { 3 // Fields 4 private int _activeRequestCount; 5 private bool _apartmentThreading; 6 private string _appDomainAppId; 7 private string _appDomainAppPath; 8 private VirtualPath _appDomainAppVPath; 9 private string _appDomainId; 10 private Timer _appDomainShutdownTimer; 11 private WaitCallback _appDomainUnloadallback; 12 private byte[] _appOfflineMessage; 13 private HttpWorkerRequest.EndOfSendNotification _asyncEndOfSendCallback; 14 private bool _beforeFirstRequest; 15 private CacheInternal _cacheInternal; 16 private Cache _cachePublic; 17 private string _clientScriptPhysicalPath; 18 private string _clientScriptVirtualPath; 19 private string _codegenDir; 20 private bool _configInited; 21 private bool _debuggingEnabled; 22 private static string _DefaultPhysicalPathOnMapPathFailure; 23 private bool _disableProcessRequestInApplicationTrust; 24 private volatile bool _disposingHttpRuntime; 25 private bool _enableHeaderChecking; 26 private static bool _enablePrefetchOptimization; 27 private FileChangesMonitor _fcm; 28 private bool _firstRequestCompleted; 29 private DateTime _firstRequestStartTime; 30 private bool _fusionInited; 31 private AsyncCallback _handlerCompletionCallback; 32 private bool _hostingInitFailed; 33 private string _hostSecurityPolicyResolverType; 34 private static Version _iisVersion; 35 private Exception _initializationError; 36 private bool _isLegacyCas; 37 private bool _isOnUNCShare; 38 private DateTime _lastShutdownAttemptTime; 39 private NamedPermissionSet _namedPermissionSet; 40 private PolicyLevel _policyLevel; 41 private bool _processRequestInApplicationTrust; 42 private Profiler _profiler; 43 private AsyncCallback _requestNotificationCompletionCallback; 44 private RequestQueue _requestQueue; 45 private bool _shutdownInProgress; 46 private string _shutDownMessage; 47 private ApplicationShutdownReason _shutdownReason; 48 private string _shutDownStack; 49 private bool _shutdownWebEventRaised; 50 private string _tempDir; 51 private static HttpRuntime _theRuntime; 52 private RequestTimeoutManager _timeoutManager; 53 private string _trustLevel; 54 private static bool _useIntegratedPipeline; 55 private bool _userForcedShutdown; 56 private string _wpUserId; 57 private static BuildManagerHostUnloadEventHandler AppDomainShutdown; 58 private const string AppOfflineFileName = "App_Offline.htm"; 59 private const string AspNetClientFilesParentVirtualPath = "/aspnet_client/system_web/"; 60 private const string AspNetClientFilesSubDirectory = "asp.netclientfiles"; 61 internal const string BinDirectoryName = "bin"; 62 internal const string BrowsersDirectoryName = "App_Browsers"; 63 internal const string CodeDirectoryName = "App_Code"; 64 internal const string codegenDirName = "Temporary ASP.NET Files"; 65 internal const string DataDirectoryName = "App_Data"; 66 private static string DirectorySeparatorString; 67 private static string DoubleDirectorySeparatorString; 68 internal const string GlobalThemesDirectoryName = "Themes"; 69 internal const string LocalResourcesDirectoryName = "App_LocalResources"; 70 private const long MaxAppOfflineFileLength = 0x100000L; 71 internal const string profileFileName = "profileoptimization.prof"; 72 internal const string ResourcesDirectoryName = "App_GlobalResources"; 73 internal static byte[] s_autogenKeys; 74 private static Hashtable s_factoryCache; 75 private static FactoryGenerator s_factoryGenerator; 76 private static object s_factoryLock; 77 private static bool s_initialized; 78 private static bool s_initializedFactory; 79 private static string s_installDirectory; 80 private static char[] s_InvalidPhysicalPathChars; 81 private static bool s_isEngineLoaded; 82 internal const string ThemesDirectoryName = "App_Themes"; 83 internal const string WebRefDirectoryName = "App_WebReferences"; 84 85 // Events 86 internal static event BuildManagerHostUnloadEventHandler AppDomainShutdown; 87 88 // Methods 89 static HttpRuntime(); 90 [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)] 91 public HttpRuntime(); 92 internal static void AddAppDomainTraceMessage(string message); 93 private void AppDomainShutdownTimerCallback(object state); 94 private static void CalculateWaitTimeAndUpdatePerfCounter(HttpWorkerRequest wr); 95 [FileIOPermission(SecurityAction.Assert, Unrestricted=true)] 96 private void CheckAccessToTempDirectory(); 97 internal static void CheckApplicationEnabled(); 98 internal static void CheckAspNetHostingPermission(AspNetHostingPermissionLevel level, string errorMessageId); 99 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 100 internal static void CheckFilePermission(string path); 101 internal static void CheckFilePermission(string path, bool writePermissions); 102 internal static void CheckVirtualFilePermission(string virtualPath); 103 [SecurityPermission(SecurityAction.Demand, Unrestricted=true)] 104 public static void Close(); 105 internal static void CoalesceNotifications(); 106 private void CreateCache(); 107 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 108 internal static object CreateNonPublicInstance(Type type); 109 [PermissionSet(SecurityAction.Assert, Unrestricted=true)] 110 internal static object CreateNonPublicInstance(Type type, object[] args); 111 private static PolicyLevel CreatePolicyLevel(string configFile, string appDir, string binDir, string strOriginUrl, out bool foundGacToken); 112 internal static object CreatePublicInstance(Type type); 113 internal static object CreatePublicInstance(Type type, object[] args); 114 internal static void DecrementActivePipelineCount(); 115 private void Dispose(); 116 private void DisposeAppDomainShutdownTimer(); 117 private void EndOfSendCallback(HttpWorkerRequest wr, object arg); 118 private void EnsureAccessToApplicationDirectory(); 119 private void EnsureFirstRequestInit(HttpContext context); 120 internal static void FailIfNoAPTCABit(Type t, XmlNode node); 121 internal static void FailIfNoAPTCABit(Type t, ElementInformation elemInfo, string propertyName); 122 internal static object FastCreatePublicInstance(Type type); 123 internal static void FinishPipelineRequest(HttpContext context); 124 private void FinishRequest(HttpWorkerRequest wr, HttpContext context, Exception e); 125 private void FinishRequestNotification(IIS7WorkerRequest wr, HttpContext context, ref RequestNotificationStatus status); 126 private void FirstRequestInit(HttpContext context); 127 internal static void ForceStaticInit(); 128 private static string GetAppDomainString(string key); 129 internal static CacheInternal GetCacheInternal(bool createIfDoesNotExist); 130 private static string GetCurrentUserName(); 131 internal static string GetGacLocation(); 132 private void GetInitConfigSections(out CacheSection cacheSection, out TrustSection trustSection, out SecurityPolicySection securityPolicySection, out CompilationSection compilationSection, out HostingEnvironmentSection hostingEnvironmentSection, out Exception initException); 133 [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Unrestricted)] 134 public static NamedPermissionSet GetNamedPermissionSet(); 135 internal static string GetRelaxedMapPathResult(string originalResult); 136 internal static string GetSafePath(string path); 137 internal static bool HasAppPathDiscoveryPermission(); 138 private static bool HasAPTCABit(Assembly assembly); 139 internal static bool HasAspNetHostingPermission(AspNetHostingPermissionLevel level); 140 internal static bool HasDbPermission(DbProviderFactory factory); 141 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 142 internal static bool HasFilePermission(string path); 143 internal static bool HasFilePermission(string path, bool writePermissions); 144 internal static bool HasPathDiscoveryPermission(string path); 145 internal static bool HasUnmanagedPermission(); 146 internal static bool HasWebPermission(Uri uri); 147 private void HostingInit(HostingEnvironmentFlags hostingFlags, PolicyLevel policyLevel, Exception appDomainCreationException); 148 internal static void IncrementActivePipelineCount(); 149 private void Init(); 150 private void InitApartmentThreading(); 151 private void InitDebuggingSupport(); 152 private void InitFusion(HostingEnvironmentSection hostingEnvironmentSection); 153 private void InitHeaderEncoding(); 154 private static void InitHttpConfiguration(); 155 private void InitializeHealthMonitoring(); 156 internal static void InitializeHostingFeatures(HostingEnvironmentFlags hostingFlags, PolicyLevel policyLevel, Exception appDomainCreationException); 157 private bool InitiateShutdownOnce(); 158 private void InitRequestQueue(); 159 private void InitTrace(HttpContext context); 160 internal static bool IsPathWithinAppRoot(string path); 161 internal static bool IsTypeAccessibleFromPartialTrust(Type t); 162 internal static bool IsTypeAllowedInConfig(Type t); 163 internal static string MakeFileUrl(string path); 164 internal static void OnAppDomainShutdown(BuildManagerHostUnloadEventArgs e); 165 private void OnAppOfflineFileChange(object sender, FileChangeEvent e); 166 internal static void OnConfigChange(string message); 167 private void OnCriticalDirectoryChange(object sender, FileChangeEvent e); 168 private void OnHandlerCompletion(IAsyncResult ar); 169 private void OnRequestNotificationCompletion(IAsyncResult ar); 170 private void OnRequestNotificationCompletionHelper(IAsyncResult ar); 171 private void OnSecurityPolicyFileChange(object sender, FileChangeEvent e); 172 internal static void PopulateIISVersionInformation(); 173 [PermissionSet(SecurityAction.Assert, Unrestricted=true)] 174 private void PreloadAssembliesFromBin(); 175 private void PreloadAssembliesFromBinRecursive(DirectoryInfo dirInfo); 176 [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Medium)] 177 public static void ProcessRequest(HttpWorkerRequest wr); 178 private void ProcessRequestInternal(HttpWorkerRequest wr); 179 internal static void ProcessRequestNoDemand(HttpWorkerRequest wr); 180 internal static RequestNotificationStatus ProcessRequestNotification(IIS7WorkerRequest wr, HttpContext context); 181 private RequestNotificationStatus ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context); 182 internal static void ProcessRequestNow(HttpWorkerRequest wr); 183 private void RaiseShutdownWebEventOnce(); 184 internal static void RecoverFromUnexceptedAppDomainUnload(); 185 private void RejectRequestInternal(HttpWorkerRequest wr, bool silent); 186 internal static void RejectRequestNow(HttpWorkerRequest wr, bool silent); 187 private void RelaxMapPathIfRequired(); 188 [PermissionSet(SecurityAction.Assert, Unrestricted=true)] 189 private void ReleaseResourcesAndUnloadAppDomain(object state); 190 internal static void ReportAppOfflineErrorMessage(HttpResponse response, byte[] appOfflineMessage); 191 internal static void RestrictIISFolders(HttpContext context); 192 private void SetAutoConfigLimits(ProcessModelSection pmConfig); 193 private static void SetAutogenKeys(); 194 [SecurityPermission(SecurityAction.Assert, ControlThread=true)] 195 internal static void SetCurrentThreadCultureWithAssert(CultureInfo cultureInfo); 196 private static void SetExecutionTimePerformanceCounter(HttpContext context); 197 internal static void SetShutdownMessage(string message); 198 internal static void SetShutdownReason(ApplicationShutdownReason reason, string message); 199 private void SetThreadPoolLimits(); 200 private void SetTrustLevel(TrustSection trustSection, SecurityPolicySection securityPolicySection); 201 private void SetTrustParameters(TrustSection trustSection, SecurityPolicySection securityPolicySection, PolicyLevel policyLevel); 202 private void SetUpCodegenDirectory(CompilationSection compilationSection); 203 private void SetUpDataDirectory(); 204 internal static void SetUserForcedShutdown(); 205 private static bool ShutdownAppDomain(string stackTrace); 206 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 207 internal static bool ShutdownAppDomain(ApplicationShutdownReason reason, string message); 208 internal static bool ShutdownAppDomainWithStackTrace(ApplicationShutdownReason reason, string message, string stackTrace); 209 private void StartAppDomainShutdownTimer(); 210 internal static void StartListeningToLocalResourcesDirectory(VirtualPath virtualDir); 211 private void StartMonitoringDirectoryRenamesAndBinDirectory(); 212 private static void StaticInit(); 213 public static void UnloadAppDomain(); 214 private static void UpdatePerfCounters(int statusCode); 215 private void WaitForRequestsToFinish(int waitTimeoutMs); 216 217 // Properties 218 internal static bool ApartmentThreading { get; } 219 public static string AppDomainAppId { get; } 220 public static string AppDomainAppPath { get; } 221 internal static string AppDomainAppPathInternal { get; } 222 public static string AppDomainAppVirtualPath { get; } 223 internal static VirtualPath AppDomainAppVirtualPathObject { get; } 224 internal static string AppDomainAppVirtualPathString { get; } 225 public static string AppDomainId { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries"), AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.High)] get; } 226 internal static string AppDomainIdInternal { get; } 227 internal static byte[] AppOfflineMessage { get; } 228 public static string AspClientScriptPhysicalPath { get; } 229 internal static string AspClientScriptPhysicalPathInternal { get; } 230 public static string AspClientScriptVirtualPath { get; } 231 public static string AspInstallDirectory { get; } 232 internal static string AspInstallDirectoryInternal { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 233 public static string BinDirectory { get; } 234 internal static string BinDirectoryInternal { get; } 235 public static Cache Cache { get; } 236 internal static CacheInternal CacheInternal { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 237 public static string ClrInstallDirectory { get; } 238 internal static string ClrInstallDirectoryInternal { get; } 239 internal static VirtualPath CodeDirectoryVirtualPath { get; } 240 public static string CodegenDir { get; } 241 internal static string CodegenDirInternal { get; } 242 internal static bool ConfigInited { get; } 243 internal static bool DebuggingEnabled { get; } 244 internal static bool DisableProcessRequestInApplicationTrust { get; } 245 internal static bool EnableHeaderChecking { get; } 246 internal static bool EnablePrefetchOptimization { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 247 internal static FileChangesMonitor FileChangesMonitor { get; } 248 internal static bool FusionInited { get; } 249 internal static bool HostingInitFailed { get; } 250 internal static string HostSecurityPolicyResolverType { get; } 251 public static Version IISVersion { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 252 internal static Exception InitializationException { get; set; } 253 internal static bool IsAspNetAppDomain { get; } 254 internal static bool IsEngineLoaded { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 255 internal static bool IsFullTrust { get; } 256 internal static bool IsLegacyCas { get; } 257 internal static bool IsMapPathRelaxed { get; } 258 public static bool IsOnUNCShare { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries"), AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Low)] get; } 259 internal static bool IsOnUNCShareInternal { get; } 260 internal static bool IsTrustLevelInitialized { get; } 261 private DateTime LastShutdownAttemptTime { get; set; } 262 public static string MachineConfigurationDirectory { get; } 263 internal static string MachineConfigurationDirectoryInternal { get; } 264 internal static NamedPermissionSet NamedPermissionSet { get; } 265 internal static PolicyLevel PolicyLevel { get; } 266 internal static bool ProcessRequestInApplicationTrust { get; } 267 internal static Profiler Profile { get; } 268 internal static RequestTimeoutManager RequestTimeoutManager { get; } 269 internal static VirtualPath ResourcesDirectoryVirtualPath { get; } 270 internal static bool ShutdownInProgress { get; } 271 internal static ApplicationShutdownReason ShutdownReason { get; } 272 public static Version TargetFramework { get; } 273 internal static string TempDirInternal { get; } 274 internal static string TrustLevel { get; } 275 internal static bool UseIntegratedPipeline { [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] get; } 276 public static bool UsingIntegratedPipeline { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 277 internal static VirtualPath WebRefDirectoryVirtualPath { get; } 278 internal static string WpUserId { get; } 279 } 280 281 282 Expand Methods 283
看ProcessRequestInternal（）方法
1 private void ProcessRequestInternal(HttpWorkerRequest wr) 2 { 3 Interlocked.Increment(ref this._activeRequestCount); 4 if (this._disposingHttpRuntime) 5 { 6 try 7 { 8 wr.SendStatus(0x1f7, "Server Too Busy"); 9 wr.SendKnownResponseHeader(12, "text/html; charset=utf-8"); 10 byte[] bytes = Encoding.ASCII.GetBytes("<html><body>Server Too Busy</body></html>"); 11 wr.SendResponseFromMemory(bytes, bytes.Length); 12 wr.FlushResponse(true); 13 wr.EndOfRequest(); 14 } 15 finally 16 { 17 Interlocked.Decrement(ref this._activeRequestCount); 18 } 19 } 20 else 21 { 22 HttpContext context; 23 try 24 { 25 context = new HttpContext(wr, false); 26 } 27 catch 28 { 29 try 30 { 31 wr.SendStatus(400, "Bad Request"); 32 wr.SendKnownResponseHeader(12, "text/html; charset=utf-8"); 33 byte[] data = Encoding.ASCII.GetBytes("<html><body>Bad Request</body></html>"); 34 wr.SendResponseFromMemory(data, data.Length); 35 wr.FlushResponse(true); 36 wr.EndOfRequest(); 37 return; 38 } 39 finally 40 { 41 Interlocked.Decrement(ref this._activeRequestCount); 42 } 43 } 44 wr.SetEndOfSendNotification(this._asyncEndOfSendCallback, context); 45 HostingEnvironment.IncrementBusyCount(); 46 try 47 { 48 try 49 { 50 this.EnsureFirstRequestInit(context); 51 } 52 catch 53 { 54 if (!context.Request.IsDebuggingRequest) 55 { 56 throw; 57 } 58 } 59 context.Response.InitResponseWriter(); 60 IHttpHandler applicationInstance = HttpApplicationFactory.GetApplicationInstance(context); 61 if (applicationInstance == null) 62 { 63 throw new HttpException(SR.GetString("Unable_create_app_object")); 64 } 65 if (EtwTrace.IsTraceEnabled(5, 1)) 66 { 67 EtwTrace.Trace(EtwTraceType.ETW_TYPE_START_HANDLER, context.WorkerRequest, applicationInstance.GetType().FullName, "Start"); 68 } 69 if (applicationInstance is IHttpAsyncHandler) 70 { 71 IHttpAsyncHandler handler2 = (IHttpAsyncHandler) applicationInstance; 72 context.AsyncAppHandler = handler2; 73 handler2.BeginProcessRequest(context, this._handlerCompletionCallback, context); 74 } 75 else 76 { 77 applicationInstance.ProcessRequest(context); 78 this.FinishRequest(context.WorkerRequest, context, null); 79 } 80 } 81 catch (Exception exception) 82 { 83 context.Response.InitResponseWriter(); 84 this.FinishRequest(wr, context, exception); 85 } 86 } 87 } 88 89 90 91
在这里创建了上下文 HttpContext context;对象，使用wr（wr中封装了请求信息）对象创建了上下文对象 context = new HttpContext(wr, false);
IHttpHandler applicationInstance = HttpApplicationFactory.GetApplicationInstance(context);使用HttpApplicationFactory创建HttpApplication对象，applicationInstance.ProcessRequest(context);在这个方法中会调用近20几个是事件，该对象在后面的事件中通过反射创建请求页面类的对象在第7个事件和第8个事件中间通过反射创建前台页面类对象，后续的事件之间又调用页面类对象的ProcessRequest方法，这就是我们写的asp.net程序后台类为什么有ProcessRequest方法了，我们应该知道前台页面类继承后台页面类，我在这里再贴一下HttpApplication类的代码
1 [ToolboxItem(false)] 2 public class HttpApplication : IComponent, IDisposable, IHttpAsyncHandler, IHttpHandler, IRequestCompletedNotifier, ISyncContext 3 { 4 // Fields 5 private EventArgs _appEvent; 6 private bool _appLevelAutoCulture; 7 private bool _appLevelAutoUICulture; 8 private CultureInfo _appLevelCulture; 9 private CultureInfo _appLevelUICulture; 10 private RequestNotification _appPostNotifications; 11 private RequestNotification _appRequestNotifications; 12 private HttpAsyncResult _ar; 13 private AsyncAppEventHandlersTable _asyncEvents; 14 private HttpContext _context; 15 private string _currentModuleCollectionKey; 16 private static readonly DynamicModuleRegistry _dynamicModuleRegistry; 17 private byte[] _entityBuffer; 18 private EventHandlerList _events; 19 private Hashtable _handlerFactories; 20 private ArrayList _handlerRecycleList; 21 private bool _hideRequestResponse; 22 private HttpContext _initContext; 23 private bool _initInternalCompleted; 24 private static bool _initSpecialCompleted; 25 private Exception _lastError; 26 private HttpModuleCollection _moduleCollection; 27 private static List<ModuleConfigurationInfo> _moduleConfigInfo; 28 private PipelineModuleStepContainer[] _moduleContainers; 29 private static Hashtable _moduleIndexMap; 30 private Dictionary<string, RequestNotification> _pipelineEventMasks; 31 private WaitCallback _resumeStepsWaitCallback; 32 private CultureInfo _savedAppLevelCulture; 33 private CultureInfo _savedAppLevelUICulture; 34 private HttpSessionState _session; 35 private ISite _site; 36 private HttpApplicationState _state; 37 private StepManager _stepManager; 38 private bool _timeoutManagerInitialized; 39 internal CountdownTask ApplicationInstanceConsumersCounter; 40 internal static readonly string AutoCulture; 41 private static readonly object EventAcquireRequestState; 42 private static readonly object EventAuthenticateRequest; 43 private static readonly object EventAuthorizeRequest; 44 private static readonly object EventBeginRequest; 45 private static readonly object EventDefaultAuthentication; 46 private static readonly object EventDisposed; 47 private static readonly object EventEndRequest; 48 private static readonly object EventErrorRecorded; 49 private static readonly object EventLogRequest; 50 private static readonly object EventMapRequestHandler; 51 private static readonly object EventPostAcquireRequestState; 52 private static readonly object EventPostAuthenticateRequest; 53 private static readonly object EventPostAuthorizeRequest; 54 private static readonly object EventPostLogRequest; 55 private static readonly object EventPostMapRequestHandler; 56 private static readonly object EventPostReleaseRequestState; 57 private static readonly object EventPostRequestHandlerExecute; 58 private static readonly object EventPostResolveRequestCache; 59 private static readonly object EventPostUpdateRequestCache; 60 private static readonly object EventPreRequestHandlerExecute; 61 private static readonly object EventPreSendRequestContent; 62 private static readonly object EventPreSendRequestHeaders; 63 private static readonly object EventReleaseRequestState; 64 private static readonly object EventRequestCompleted; 65 private static readonly object EventResolveRequestCache; 66 private static readonly object EventUpdateRequestCache; 67 internal const string IMPLICIT_FILTER_MODULE = "AspNetFilterModule"; 68 internal const string IMPLICIT_HANDLER = "ManagedPipelineHandler"; 69 internal const string MANAGED_PRECONDITION = "managedHandler"; 70 71 // Events 72 public event EventHandler AcquireRequestState; 73 public event EventHandler AuthenticateRequest; 74 public event EventHandler AuthorizeRequest; 75 public event EventHandler BeginRequest; 76 internal event EventHandler DefaultAuthentication; 77 public event EventHandler Disposed; 78 public event EventHandler EndRequest; 79 public event EventHandler Error; 80 public event EventHandler LogRequest; 81 public event EventHandler MapRequestHandler; 82 public event EventHandler PostAcquireRequestState; 83 public event EventHandler PostAuthenticateRequest; 84 public event EventHandler PostAuthorizeRequest; 85 public event EventHandler PostLogRequest; 86 public event EventHandler PostMapRequestHandler; 87 public event EventHandler PostReleaseRequestState; 88 public event EventHandler PostRequestHandlerExecute; 89 public event EventHandler PostResolveRequestCache; 90 public event EventHandler PostUpdateRequestCache; 91 public event EventHandler PreRequestHandlerExecute; 92 public event EventHandler PreSendRequestContent; 93 public event EventHandler PreSendRequestHeaders; 94 public event EventHandler ReleaseRequestState; 95 public event EventHandler RequestCompleted; 96 public event EventHandler ResolveRequestCache; 97 public event EventHandler UpdateRequestCache; 98 99 // Methods 100 static HttpApplication(); 101 public HttpApplication(); 102 internal void AcquireNotifcationContextLock(ref bool locked); 103 private void AddEventMapping(string moduleName, RequestNotification requestNotification, bool isPostNotification, IExecutionStep step); 104 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 105 public void AddOnAcquireRequestStateAsync(BeginEventHandler bh, EndEventHandler eh); 106 public void AddOnAcquireRequestStateAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 107 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 108 public void AddOnAuthenticateRequestAsync(BeginEventHandler bh, EndEventHandler eh); 109 public void AddOnAuthenticateRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 110 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 111 public void AddOnAuthorizeRequestAsync(BeginEventHandler bh, EndEventHandler eh); 112 public void AddOnAuthorizeRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 113 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 114 public void AddOnBeginRequestAsync(BeginEventHandler bh, EndEventHandler eh); 115 public void AddOnBeginRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 116 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 117 public void AddOnEndRequestAsync(BeginEventHandler bh, EndEventHandler eh); 118 public void AddOnEndRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 119 public void AddOnLogRequestAsync(BeginEventHandler bh, EndEventHandler eh); 120 public void AddOnLogRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 121 public void AddOnMapRequestHandlerAsync(BeginEventHandler bh, EndEventHandler eh); 122 public void AddOnMapRequestHandlerAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 123 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 124 public void AddOnPostAcquireRequestStateAsync(BeginEventHandler bh, EndEventHandler eh); 125 public void AddOnPostAcquireRequestStateAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 126 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 127 public void AddOnPostAuthenticateRequestAsync(BeginEventHandler bh, EndEventHandler eh); 128 public void AddOnPostAuthenticateRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 129 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 130 public void AddOnPostAuthorizeRequestAsync(BeginEventHandler bh, EndEventHandler eh); 131 public void AddOnPostAuthorizeRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 132 public void AddOnPostLogRequestAsync(BeginEventHandler bh, EndEventHandler eh); 133 public void AddOnPostLogRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 134 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 135 public void AddOnPostMapRequestHandlerAsync(BeginEventHandler bh, EndEventHandler eh); 136 public void AddOnPostMapRequestHandlerAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 137 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 138 public void AddOnPostReleaseRequestStateAsync(BeginEventHandler bh, EndEventHandler eh); 139 public void AddOnPostReleaseRequestStateAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 140 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 141 public void AddOnPostRequestHandlerExecuteAsync(BeginEventHandler bh, EndEventHandler eh); 142 public void AddOnPostRequestHandlerExecuteAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 143 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 144 public void AddOnPostResolveRequestCacheAsync(BeginEventHandler bh, EndEventHandler eh); 145 public void AddOnPostResolveRequestCacheAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 146 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 147 public void AddOnPostUpdateRequestCacheAsync(BeginEventHandler bh, EndEventHandler eh); 148 public void AddOnPostUpdateRequestCacheAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 149 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 150 public void AddOnPreRequestHandlerExecuteAsync(BeginEventHandler bh, EndEventHandler eh); 151 public void AddOnPreRequestHandlerExecuteAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 152 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 153 public void AddOnReleaseRequestStateAsync(BeginEventHandler bh, EndEventHandler eh); 154 public void AddOnReleaseRequestStateAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 155 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 156 public void AddOnResolveRequestCacheAsync(BeginEventHandler bh, EndEventHandler eh); 157 public void AddOnResolveRequestCacheAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 158 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 159 public void AddOnUpdateRequestCacheAsync(BeginEventHandler bh, EndEventHandler eh); 160 public void AddOnUpdateRequestCacheAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 161 private void AddSendResponseEventHookup(object key, Delegate handler); 162 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 163 internal void AddSyncEventHookup(object key, Delegate handler, RequestNotification notification); 164 private void AddSyncEventHookup(object key, Delegate handler, RequestNotification notification, bool isPostNotification); 165 internal void AssignContext(HttpContext context); 166 internal IAsyncResult BeginProcessRequestNotification(HttpContext context, AsyncCallback cb); 167 private void BuildEventMaskDictionary(Dictionary<string, RequestNotification> eventMask); 168 private HttpModuleCollection BuildIntegratedModuleCollection(List<ModuleConfigurationInfo> moduleList); 169 internal void ClearError(); 170 public void CompleteRequest(); 171 private HttpModuleCollection CreateDynamicModules(); 172 private void CreateEventExecutionSteps(object eventIndex, ArrayList steps); 173 internal IExecutionStep CreateImplicitAsyncPreloadExecutionStep(); 174 public virtual void Dispose(); 175 internal void DisposeInternal(); 176 internal RequestNotificationStatus EndProcessRequestNotification(IAsyncResult result); 177 internal void EnsureReleaseState(); 178 internal Exception ExecuteStep(IExecutionStep step, ref bool completedSynchronously); 179 private IEnumerable<ModuleConfigurationInfo> GetConfigInfoForDynamicModules(); 180 [SecurityPermission(SecurityAction.Assert, ControlPrincipal=true)] 181 internal static WindowsIdentity GetCurrentWindowsIdentityWithAssert(); 182 private IHttpHandlerFactory GetFactory(string type); 183 private IHttpHandlerFactory GetFactory(HttpHandlerAction mapping); 184 internal static string GetFallbackCulture(string culture); 185 private HttpHandlerAction GetHandlerMapping(HttpContext context, string requestType, VirtualPath path, bool useAppConfig); 186 private HttpModuleCollection GetModuleCollection(IntPtr appContext); 187 private PipelineModuleStepContainer GetModuleContainer(string moduleName); 188 public virtual string GetOutputCacheProviderName(HttpContext context); 189 public virtual string GetVaryByCustomString(HttpContext context, string custom); 190 private bool HasEventSubscription(object eventIndex); 191 private void HookupEventHandlersForApplicationAndModules(MethodInfo[] handlers); 192 public virtual void Init(); 193 private void InitAppLevelCulture(); 194 private void InitIntegratedModules(); 195 internal void InitInternal(HttpContext context, HttpApplicationState state, MethodInfo[] handlers); 196 private void InitModules(); 197 private void InitModulesCommon(); 198 internal void InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context); 199 [ReflectionPermission(SecurityAction.Assert, Flags=ReflectionPermissionFlag.RestrictedMemberAccess)] 200 private void InvokeMethodWithAssert(MethodInfo method, int paramCount, object eventSource, EventArgs eventArgs); 201 internal IHttpHandler MapHttpHandler(HttpContext context, string requestType, VirtualPath path, string pathTranslated, bool useAppConfig); 202 internal IHttpHandler MapIntegratedHttpHandler(HttpContext context, string requestType, VirtualPath path, string pathTranslated, bool useAppConfig, bool convertNativeStaticFileModule); 203 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 204 internal ThreadContext OnThreadEnter(); 205 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 206 internal ThreadContext OnThreadEnter(bool setImpersonationContext); 207 private ThreadContext OnThreadEnterPrivate(bool setImpersonationContext); 208 private void ProcessEventSubscriptions(out RequestNotification requestNotifications, out RequestNotification postRequestNotifications); 209 internal void ProcessSpecialRequest(HttpContext context, MethodInfo method, int paramCount, object eventSource, EventArgs eventArgs, HttpSessionState session); 210 internal void RaiseErrorWithoutContext(Exception error); 211 private void RaiseOnError(); 212 internal void RaiseOnPreSendRequestContent(); 213 internal void RaiseOnPreSendRequestHeaders(); 214 private void RaiseOnRequestCompleted(); 215 private void RecordError(Exception error); 216 private void RecycleHandlers(); 217 private void RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers); 218 private void RegisterIntegratedEvent(IntPtr appContext, string moduleName, RequestNotification requestNotifications, RequestNotification postRequestNotifications, string moduleType, string modulePrecondition, bool useHighPriority); 219 public static void RegisterModule(Type moduleType); 220 internal static void RegisterModuleInternal(Type moduleType); 221 internal void ReleaseAppInstance(); 222 internal void ReleaseNotifcationContextLock(); 223 private void RemoveSendResponseEventHookup(object key, Delegate handler); 224 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 225 internal void RemoveSyncEventHookup(object key, Delegate handler, RequestNotification notification); 226 internal void RemoveSyncEventHookup(object key, Delegate handler, RequestNotification notification, bool isPostNotification); 227 private void RestoreAppLevelCulture(); 228 private void ResumeSteps(Exception error); 229 private void ResumeStepsFromThreadPoolThread(Exception error); 230 private void ResumeStepsWaitCallback(object error); 231 private void SetAppLevelCulture(); 232 [SecurityPermission(SecurityAction.Assert, ControlPrincipal=true)] 233 internal static void SetCurrentPrincipalWithAssert(IPrincipal user); 234 IAsyncResult IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData); 235 void IHttpAsyncHandler.EndProcessRequest(IAsyncResult result); 236 void IHttpHandler.ProcessRequest(HttpContext context); 237 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 238 ISyncContextLock ISyncContext.Enter(); 239 private void ThrowIfEventBindingDisallowed(); 240 241 // Properties 242 internal EventArgs AppEvent { get; set; } 243 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 244 public HttpApplicationState Application { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 245 private AsyncAppEventHandlersTable AsyncEvents { get; } 246 internal HttpAsyncResult AsyncResult { get; set; } 247 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 248 public HttpContext Context { get; } 249 internal string CurrentModuleCollectionKey { get; } 250 private PipelineModuleStepContainer CurrentModuleContainer { get; } 251 internal byte[] EntityBuffer { get; } 252 protected EventHandlerList Events { get; } 253 internal static List<ModuleConfigurationInfo> IntegratedModuleList { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 254 private bool IsContainerInitalizationAllowed { get; } 255 internal bool IsRequestCompleted { get; } 256 internal Exception LastError { get; } 257 private PipelineModuleStepContainer[] ModuleContainers { get; } 258 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 259 public HttpModuleCollection Modules { [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.High)] get; } 260 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 261 public HttpRequest Request { get; } 262 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 263 public HttpResponse Response { get; } 264 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 265 public HttpServerUtility Server { get; } 266 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 267 public HttpSessionState Session { get; } 268 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 269 public ISite Site { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] set; } 270 bool IHttpHandler.IsReusable { get; } 271 bool IRequestCompletedNotifier.IsRequestCompleted { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 272 HttpContext ISyncContext.HttpContext { get; } 273 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 274 public IPrincipal User { get; } 275 276 // Nested Types 277 internal class ApplicationStepManager : HttpApplication.StepManager 278 { 279 // Fields 280 private int _currentStepIndex; 281 private int _endRequestStepIndex; 282 private HttpApplication.IExecutionStep[] _execSteps; 283 private int _numStepCalls; 284 private int _numSyncStepCalls; 285 private WaitCallback _resumeStepsWaitCallback; 286 287 // Methods 288 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 289 internal ApplicationStepManager(HttpApplication app); 290 internal override void BuildSteps(WaitCallback stepCallback); 291 internal override void InitRequest(); 292 [DebuggerStepperBoundary] 293 internal override void ResumeSteps(Exception error); 294 } 295 296 internal class AsyncAppEventHandler 297 { 298 // Fields 299 private ArrayList _beginHandlers; 300 private int _count; 301 private ArrayList _endHandlers; 302 private ArrayList _stateObjects; 303 304 // Methods 305 internal AsyncAppEventHandler(); 306 internal void Add(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 307 internal void CreateExecutionSteps(HttpApplication app, ArrayList steps); 308 internal void Reset(); 309 310 // Properties 311 internal int Count { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 312 } 313 314 internal class AsyncAppEventHandlersTable 315 { 316 // Fields 317 private Hashtable _table; 318 319 // Methods 320 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 321 public AsyncAppEventHandlersTable(); 322 internal void AddHandler(object eventId, BeginEventHandler beginHandler, EndEventHandler endHandler, object state, RequestNotification requestNotification, bool isPost, HttpApplication app); 323 324 // Properties 325 internal HttpApplication.AsyncAppEventHandler this[object eventId] { get; } 326 } 327 328 internal class AsyncEventExecutionStep : HttpApplication.IExecutionStep 329 { 330 // Fields 331 private HttpApplication _application; 332 private HttpApplication.AsyncStepCompletionInfo _asyncStepCompletionInfo; 333 private BeginEventHandler _beginHandler; 334 private AsyncCallback _completionCallback; 335 private EndEventHandler _endHandler; 336 private object _state; 337 private bool _sync; 338 private string _targetTypeStr; 339 340 // Methods 341 internal AsyncEventExecutionStep(HttpApplication app, BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 342 internal AsyncEventExecutionStep(HttpApplication app, BeginEventHandler beginHandler, EndEventHandler endHandler, object state, bool useIntegratedPipeline); 343 private void OnAsyncEventCompletion(IAsyncResult ar); 344 private void ResumeSteps(Exception error); 345 [PermissionSet(SecurityAction.Assert, Unrestricted=true)] 346 private void ResumeStepsWithAssert(Exception error); 347 void HttpApplication.IExecutionStep.Execute(); 348 349 // Properties 350 bool HttpApplication.IExecutionStep.CompletedSynchronously { get; } 351 bool HttpApplication.IExecutionStep.IsCancellable { get; } 352 } 353 354 [StructLayout(LayoutKind.Sequential)] 355 private struct AsyncStepCompletionInfo 356 { 357 private volatile int _asyncState; 358 private ExceptionDispatchInfo _error; 359 private const int ASYNC_STATE_NONE = 0; 360 private const int ASYNC_STATE_BEGIN_UNWOUND = 1; 361 private const int ASYNC_STATE_CALLBACK_COMPLETED = 2; 362 public bool RegisterAsyncCompletion(Exception error); 363 public void RegisterBeginUnwound(IAsyncResult asyncResult, out bool operationCompleted, out bool mustCallEndHandler); 364 public void ReportError(); 365 public void Reset(); 366 } 367 368 internal class CallFilterExecutionStep : HttpApplication.IExecutionStep 369 { 370 // Fields 371 private HttpApplication _application; 372 373 // Methods 374 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 375 internal CallFilterExecutionStep(HttpApplication app); 376 void HttpApplication.IExecutionStep.Execute(); 377 378 // Properties 379 bool HttpApplication.IExecutionStep.CompletedSynchronously { get; } 380 bool HttpApplication.IExecutionStep.IsCancellable { get; } 381 } 382 383 internal class CallHandlerExecutionStep : HttpApplication.IExecutionStep 384 { 385 // Fields 386 private HttpApplication _application; 387 private HttpApplication.AsyncStepCompletionInfo _asyncStepCompletionInfo; 388 private AsyncCallback _completionCallback; 389 private IHttpAsyncHandler _handler; 390 private bool _sync; 391 392 // Methods 393 internal CallHandlerExecutionStep(HttpApplication app); 394 private void OnAsyncHandlerCompletion(IAsyncResult ar); 395 private void ResumeSteps(Exception error); 396 [PermissionSet(SecurityAction.Assert, Unrestricted=true)] 397 private void ResumeStepsWithAssert(Exception error); 398 private static void SuppressPostEndRequestIfNecessary(HttpContext context); 399 void HttpApplication.IExecutionStep.Execute(); 400 401 // Properties 402 bool HttpApplication.IExecutionStep.CompletedSynchronously { get; } 403 bool HttpApplication.IExecutionStep.IsCancellable { get; } 404 } 405 406 internal class CancelModuleException 407 { 408 // Fields 409 private bool _timeout; 410 411 // Methods 412 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 413 internal CancelModuleException(bool timeout); 414 415 // Properties 416 internal bool Timeout { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 417 } 418 419 internal interface IExecutionStep 420 { 421 // Methods 422 void Execute(); 423 424 // Properties 425 bool CompletedSynchronously { get; } 426 bool IsCancellable { get; } 427 } 428 429 internal class MapHandlerExecutionStep : HttpApplication.IExecutionStep 430 { 431 // Fields 432 private HttpApplication _application; 433 434 // Methods 435 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 436 internal MapHandlerExecutionStep(HttpApplication app); 437 void HttpApplication.IExecutionStep.Execute(); 438 439 // Properties 440 bool HttpApplication.IExecutionStep.CompletedSynchronously { get; } 441 bool HttpApplication.IExecutionStep.IsCancellable { get; } 442 } 443 444 internal class MaterializeHandlerExecutionStep : HttpApplication.IExecutionStep 445 { 446 // Fields 447 private HttpApplication _application; 448 449 // Methods 450 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 451 internal MaterializeHandlerExecutionStep(HttpApplication app); 452 void HttpApplication.IExecutionStep.Execute(); 453 454 // Properties 455 bool HttpApplication.IExecutionStep.CompletedSynchronously { get; } 456 bool HttpApplication.IExecutionStep.IsCancellable { get; } 457 } 458 459 internal class NoopExecutionStep : HttpApplication.IExecutionStep 460 { 461 // Methods 462 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 463 internal NoopExecutionStep(); 464 void HttpApplication.IExecutionStep.Execute(); 465 466 // Properties 467 bool HttpApplication.IExecutionStep.CompletedSynchronously { get; } 468 bool HttpApplication.IExecutionStep.IsCancellable { get; } 469 } 470 471 internal class PipelineStepManager : HttpApplication.StepManager 472 { 473 // Fields 474 private WaitCallback _resumeStepsWaitCallback; 475 private bool _validateInputCalled; 476 private bool _validatePathCalled; 477 478 // Methods 479 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 480 internal PipelineStepManager(HttpApplication app); 481 internal override void BuildSteps(WaitCallback stepCallback); 482 internal override void InitRequest(); 483 [DebuggerStepperBoundary] 484 internal override void ResumeSteps(Exception error); 485 private Exception ValidateHelper(HttpContext context); 486 } 487 488 internal class SendResponseExecutionStep : HttpApplication.IExecutionStep 489 { 490 // Fields 491 private HttpApplication _application; 492 private EventHandler _handler; 493 private bool _isHeaders; 494 495 // Methods 496 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 497 internal SendResponseExecutionStep(HttpApplication app, EventHandler handler, bool isHeaders); 498 void HttpApplication.IExecutionStep.Execute(); 499 500 // Properties 501 bool HttpApplication.IExecutionStep.CompletedSynchronously { get; } 502 bool HttpApplication.IExecutionStep.IsCancellable { get; } 503 } 504 505 internal abstract class StepManager 506 { 507 // Fields 508 protected HttpApplication _application; 509 protected bool _requestCompleted; 510 511 // Methods 512 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 513 internal StepManager(HttpApplication application); 514 internal abstract void BuildSteps(WaitCallback stepCallback); 515 internal void CompleteRequest(); 516 internal abstract void InitRequest(); 517 internal abstract void ResumeSteps(Exception error); 518 519 // Properties 520 internal bool IsCompleted { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 521 } 522 523 internal class SyncEventExecutionStep : HttpApplication.IExecutionStep 524 { 525 // Fields 526 private HttpApplication _application; 527 private EventHandler _handler; 528 529 // Methods 530 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 531 internal SyncEventExecutionStep(HttpApplication app, EventHandler handler); 532 void HttpApplication.IExecutionStep.Execute(); 533 534 // Properties 535 internal EventHandler Handler { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 536 bool HttpApplication.IExecutionStep.CompletedSynchronously { [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] get; } 537 bool HttpApplication.IExecutionStep.IsCancellable { [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] get; } 538 } 539 540 internal class TransitionToWebSocketsExecutionStep : HttpApplication.IExecutionStep 541 { 542 // Fields 543 private readonly HttpApplication _application; 544 545 // Methods 546 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 547 internal TransitionToWebSocketsExecutionStep(HttpApplication app); 548 void HttpApplication.IExecutionStep.Execute(); 549 550 // Properties 551 public bool CompletedSynchronously { [CompilerGenerated, TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [CompilerGenerated] private set; } 552 public bool IsCancellable { get; } 553 } 554 555 internal class UrlMappingsExecutionStep : HttpApplication.IExecutionStep 556 { 557 // Fields 558 private HttpApplication _application; 559 560 // Methods 561 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 562 internal UrlMappingsExecutionStep(HttpApplication app); 563 void HttpApplication.IExecutionStep.Execute(); 564 565 // Properties 566 bool HttpApplication.IExecutionStep.CompletedSynchronously { get; } 567 bool HttpApplication.IExecutionStep.IsCancellable { get; } 568 } 569 570 internal class ValidatePathExecutionStep : HttpApplication.IExecutionStep 571 { 572 // Fields 573 private HttpApplication _application; 574 575 // Methods 576 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 577 internal ValidatePathExecutionStep(HttpApplication app); 578 void HttpApplication.IExecutionStep.Execute(); 579 580 // Properties 581 bool HttpApplication.IExecutionStep.CompletedSynchronously { get; } 582 bool HttpApplication.IExecutionStep.IsCancellable { get; } 583 } 584 585 internal class ValidateRequestExecutionStep : HttpApplication.IExecutionStep 586 { 587 // Fields 588 private HttpApplication _application; 589 590 // Methods 591 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 592 internal ValidateRequestExecutionStep(HttpApplication app); 593 void HttpApplication.IExecutionStep.Execute(); 594 595 // Properties 596 bool HttpApplication.IExecutionStep.CompletedSynchronously { get; } 597 bool HttpApplication.IExecutionStep.IsCancellable { get; } 598 } 599 } 600 601 602 Expand Methods 603
感兴趣的可以看一下这里面的属性，事件（事件执行顺序并不是写的那个顺序）；下面我画张图，简单描述一下过程
剩下就是页面类执行ProcessRequest的方法了，今天先不说了，太晚了。接下来我们继续mvc也可以了，我们mvc并没有页面类的ProcessRequest方法，以后有时间在说这里吧。