最近项目遇到需要读取RedisSessionStateProvider配置文件applicationName节点，如：
读取的方法有很多：
1直接读取web.config文件，
void test1()
{
SessionStateSection config = (SessionStateSection)WebConfigurationManager.GetSection("system.web/sessionState");
string providerName = config.CustomProvider;
ProviderSettings ps = config.Providers[providerName];
string str = ps.Parameters["applicationName"];
}
2通过SessionStateStoreProviderBase来访问对象属性， 可惜的是对应的属性及类都是内部的，所以我们需要用到反射。
所以编码为如下：
void test2()
{
var type = typeof(RedisSessionStateProvider);
//获取RedisSessionStateProvider的静态configuration字段
var configField = type.GetField("configuration", BindingFlags.Static | BindingFlags.NonPublic);
var configValue = configField.GetValue(new RedisSessionStateProvider());
type = configField.FieldType;
//获取configuration的ApplicationName属性
var prop = type.GetProperty("ApplicationName");
var obj = prop.GetValue(configValue).ToString();
} T GetSessionStateStoreProviderBase<T>() where T : SessionStateStoreProviderBase, new()
{
SessionStateSection config = (SessionStateSection)WebConfigurationManager.GetSection("system.web/sessionState");
string providerName = config.CustomProvider;
ProviderSettings ps = config.Providers[providerName];
ProviderBase provide = ProvidersHelper.InstantiateProvider(ps, typeof(T));
return (provide as T);
}
3 次方法和方法2一样好，直接放问实例或对象的属性，ProviderConfiguration和configuration属性都是内部的，我们可以不通过修改源码（或者用mono ceil 来修改dll文件）使ProviderConfiguration类和configuration属性成为public。 那么code就很简单了
string applicationName1 = RedisSessionStateProvider.configuration.ApplicationName;
4 用mono ceil 来修改dll文件，方法3是找到源码直接修改，这里方法4是没有源码，用monon修改的。我们新建一个控制台应用程序，添加
<package id="Mono.Cecil" version="0.9.6.0" targetFramework="net46" />
using System;
using System.IO;
using System.Linq;
using Mono.Cecil;
class Program
{
static void Main(string[] args)
{
string filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Microsoft.Web.RedisSessionStateProvider.dll");
AssemblyDefinition asm = AssemblyDefinition.ReadAssembly(filePath);
TypeDefinition[] types = asm.MainModule.Types.ToArray(); //修改ProviderConfiguration为public
TypeDefinition typeConfiguration = types.FirstOrDefault(x => x.Name == "ProviderConfiguration");
typeConfiguration.IsPublic = true; //修改ProviderConfiguration的字段为public
TypeDefinition typeRedisProvide = types.FirstOrDefault(x => x.Name == "RedisSessionStateProvider");
FieldDefinition filedConfiguration = typeRedisProvide.Fields.ToArray().FirstOrDefault(x => x.Name == "configuration");
filedConfiguration.IsPublic = true; //修改程序集的签名
foreach (ModuleDefinition item in asm.Modules)
{
var assemblyName = item.Assembly.Name;
assemblyName.PublicKey = GetPublicKey();
assemblyName.PublicKeyToken = GetPubliKeyToken();
}
//保存dll文件
filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Microsoft.Web.RedisSessionStateProvider2.dll");
asm.Write(filePath); //Console.ReadLine();
}
private static byte[] GetPublicKey()
{
string s = @"00240000048000009400000006020000002400005253413100040000010001005b0b4a219a91bee970338aadc8890eb73db3a87500c9b82cf605bebdb64f74769a213fbdf0476641c728281ffb5bb700c7f0a55f5407bfe984eb4abfd947ddbc6476c8ea4c5207421750dc2385fd99163cbb12df87190793552334614985258c830b8d960b5e21c5a0cc6be0941b3d1777c8a09d22db62ed59e5540822c6289b";
return StrToHexBytes(s);
}
private static byte[] GetPubliKeyToken()
{
string s = "f68305d2ab29aee8";
return StrToHexBytes(s);
}
private static byte[] StrToHexBytes(string hexString)
{
hexString = hexString.Replace(" ", "");
if ((hexString.Length % ) != )
hexString += " ";
byte[] returnBytes = new byte[hexString.Length / ];
for (int i = ; i < returnBytes.Length; i++)
returnBytes[i] = Convert.ToByte(hexString.Substring(i * , ), );
return returnBytes;
}
}
GetPublicKey 和GetPubliKeyToken 字符串来源于
先修改Microsoft.Web.RedisSessionStateProvider.dll 文件 另存为Microsoft.Web.RedisSessionStateProvider2.dll，在放到特定目录下 改为Microsoft.Web.RedisSessionStateProvider.dll 对其修改签名。
代用方式和方法3一样 就一行code string applicationName1 = RedisSessionStateProvider.configuration.ApplicationName;
http://blog.csdn.NET/ma_jiang/article/details/7936235
整个项目需要用nuget 来安装Microsoft.Web.RedisSessionStateProvider。至于用mono ceil 来修改dll文件， 网上有你很多， 一定给要记住修改签名哦哦。
当然偶尔也有写入Config的需求：比如我想把redis 连接串放到一个单独的config文件里面如：
<appSettings>
<add key="RedisConnectionString" value="127.0.0.1:6379,abortConnect=false,connectRetry=3,connectTimeout=3000,defaultDatabase=2,syncTimeout=3000,version=3.2.1,responseTimeout=3000"/>
</appSettings>
那么什么时候可以把它覆盖到我们配置对象中了：
protected void Application_Start(object sender, EventArgs e)
{
SessionStateSection config = (SessionStateSection)WebConfigurationManager.GetSection("system.web/sessionState");
string providerName = config.CustomProvider;
ProviderSettings ps = config.Providers[providerName];
// string str = ps.Parameters["applicationName"];
string connStr = ConfigurationManager.AppSettings["RedisConnectionString"];
ps.Parameters["connectionString"] = connStr;
}
读取有几种方式那么 写入也就有对应的几种方式。