asp.net 读取RedisSessionStateProvider配置

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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

    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 % 2) != 0)                hexString += " ";            byte[] returnBytes = new byte[hexString.Length / 2];            for (int i = 0; i < returnBytes.Length; i++)                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);            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：

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。

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