1.配置支持AnyCpu编译模式
2.使用Http代理服务
3.Cookie隔离,每个IWebBrowser实例的数据不共享
4.使用IResponseFilter获取响应数据
1.配置支持AnyCpu编译模式
CefSharp从51版本以后开始支持AnyCpu编译模式，首先需要在当前项目的csproj文件的PropertyGroup节点下第一行增加一个配置项
<CefSharpAnyCpuSupport>true</CefSharpAnyCpuSupport>
然后在程序的启动入口配置动态加载目标平台x86/x64的程序集：
[STAThread] static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); AppDomain.CurrentDomain.AssemblyResolve += Resolver; Application.Run(new Form1()); } private static Assembly Resolver(object sender, ResolveEventArgs args) { if (args.Name.StartsWith("CefSharp")) { string assemblyName = args.Name.Split(new[] { ‘,‘ }, 2)[0] + ".dll"; string archSpecificPath = Path.Combine(AppDomain.CurrentDomain.SetupInformation.ApplicationBase, Environment.Is64BitProcess ? "x64" : "x86", assemblyName); return File.Exists(archSpecificPath) ? Assembly.LoadFile(archSpecificPath) : null; } return null; }
这种方法是根据运行的目标平台动态去加载对应的程序集，如果我们能明确运行平台则可以不用加上面的代码逻辑，在当前项目App.config文件的根节点下加入以下配置即可：
<runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <probing privatePath="x64"/><!--如果是32位系统,则换成x86--> </assemblyBinding> </runtime>
2.使用Http代理服务
网上一些文章介绍的通过添加命令行参数CefCommandLineArgs的方式，我试了一下不管用，通过 CefSharpSettings.Proxy = new ProxyOptions("ipadress", "prot", "username", "password"); 这句是可以配置成功的，但这个是全局配置，不能满足独立我要控制每个browser实例各自使用自己的代理服务器。通过在初始化ChromiumWebBrowser的地方加入以下代码可实现动态设置代理。
var browser = new ChromiumWebBrowser("url", context);
browser.RequestHandler = new DefaultRequestHandler();
Cef.UIThreadTaskFactory.StartNew(delegate
{
var rc = browser.GetBrowser().GetHost().RequestContext;
rc.GetAllPreferences(true);
var dict = new Dictionary<string, object>();
dict.Add("mode", "fixed_servers");
dict.Add("server", "ipaddress:prot"); //此处替换成实际 ip地址：端口
string error;
bool success = rc.SetPreference("proxy", dict, out error);
if (!success)
{
Console.WriteLine("something happen with the prerence set up" + error);
}
});
如果代理服务有用户名密码的话，则需要在DefaultRequestHandler类里重写GetAuthCredentials方法，如下：
protected override bool GetAuthCredentials(IWebBrowser chromiumWebBrowser, IBrowser browser, string originUrl, bool isProxy, string host, int port, string realm, string scheme, IAuthCallback callback) { if (isProxy) { callback.Continue("username", "passwrod"); return true; } return false; }
这样就可以实现每个ChromiumWebBrowser运行实例独立连接自己的代理服务器了。
3.Cookie隔离,每个IWebBrowser实例的数据不共享
要保证多个browser实例之间cookie不共享，就不要在全局设置CefSettings中设置CachePath值，应该在实例的RequestContextSettings中设置，可以设置成每个browser拥有独立的缓存目录。在RequestContext内添加的cookie只有当前browser才能访问，从而实现cookie隔离。
var setting = new RequestContextSettings() { CachePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "CefSharp\\Cache_" + name), PersistSessionCookies = true, PersistUserPreferences = true }; var context = new RequestContext(setting); var cookieManager = context.GetCookieManager(null); //这样设置的cookie不是全局的，只有当前browser才能访问 cookieManager.SetCookie("domain", new Cookie { Name = "cookiename", Value = "cookievalue", Path = "/" }); var browser = new ChromiumWebBrowser("url", context);
4.使用IResponseFilter获取响应数据
要获取ChromiumWebBrowser中每个请求的响应body内容并不是那么方便，拿到Frame的html内容倒是很简单，使用IFrame的GetSourceAsync()方法就行，但有时候我们需要单个请求的响应结果，这就需要自定义实现IResponseFilter接口来实现响应数据的拦截。
//DefaultResourceHandler的构造可以放在IRequestHandler的实现类的GetResourceRequestHandler方法内
class DefaultResourceHandler : ResourceRequestHandler { protected override IResponseFilter GetResourceResponseFilter(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response) { if (response.MimeType.Equals("application/json", StringComparison.OrdinalIgnoreCase)) { return JsonResponseFilter.CreateFilter(request.Identifier.ToString()); } return null; } protected override void OnResourceLoadComplete(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response, UrlRequestStatus status, long receivedContentLength) { var filter = JsonResponseFilter.GetFileter(request.Identifier.ToString()) as JsonResponseFilter; if (filter != null) { var encode = !string.IsNullOrEmpty(response.Charset) ? Encoding.GetEncoding(response.Charset) : Encoding.UTF8; using (var read = new StreamReader(filter.GetStream(), encode)) { var text = read.ReadToEnd(); Debug.WriteLine(text); } } } } public class JsonResponseFilter : IResponseFilter { private MemoryStream Stream; public JsonResponseFilter() { Stream = new MemoryStream(); } public FilterStatus Filter(System.IO.Stream dataIn, out long dataInRead, System.IO.Stream dataOut, out long dataOutWritten) { try { if (dataIn == null || dataIn.Length == 0) { dataInRead = 0; dataOutWritten = 0; return FilterStatus.Done; } dataInRead = dataIn.Length; dataOutWritten = Math.Min(dataInRead, dataOut.Length); dataIn.CopyTo(dataOut); dataIn.Seek(0, SeekOrigin.Begin); byte[] bs = new byte[dataIn.Length]; dataIn.Read(bs, 0, bs.Length); Stream.Write(bs, 0, bs.Length); dataInRead = dataIn.Length; dataOutWritten = dataIn.Length; return FilterStatus.NeedMoreData; } catch (Exception ex) { dataInRead = dataIn.Length; dataOutWritten = dataIn.Length; return FilterStatus.Done; } } public bool InitFilter() { return true; } public Stream GetStream() { Stream.Seek(0, SeekOrigin.Begin); return Stream; } public void Dispose() { } private static Dictionary<string, IResponseFilter> _dictionary = new Dictionary<string, IResponseFilter>(); public static IResponseFilter CreateFilter(string id) { var filter = new JsonResponseFilter(); _dictionary[id] = filter; return filter; } public static IResponseFilter GetFileter(string id) { if (_dictionary.ContainsKey(id)) { var filter = _dictionary[id]; _dictionary.Remove(id); return filter; } return null; } }
为了截获响应数据绕了这么一大圈有点费劲，不过人家这种设计也是为了方便外部扩展，可以针对不同响应类型的response来实现IResponseFilter过滤器。