Mvc动态注册HttpModule详解

[SecuritySafeCritical]
public static void RegisterModule(Type moduleType)
{
  if (DynamicModuleReflectionUtil.Fx45RegisterModuleDelegate != null)
  {
DynamicModuleReflectionUtil.Fx45RegisterModuleDelegate(moduleType);
    return;
  }DynamicModuleUtility.LegacyModuleRegistrar.RegisterModule(moduleType);
}

[assembly: WebActivatorEx.PreApplicationStartMethod(typeof(RoutingCore.PreApplicationStartRegist), "PreStart")]
namespace RoutingCore
{
  public class PreApplicationStartRegist
  {
    private static bool hasLoaded;
    public static void PreStart()
    {
      if (!hasLoaded)
      {
        hasLoaded = true;
        DynamicModuleUtility.RegisterModule(typeof(RoutingModule));
      }
    }
  }
}

public class RoutingModule : IHttpModule
  {
    public void Init(HttpApplication context)
    {
      context.BeginRequest += new EventHandler(context_BeginRequest);
      context.Error += new EventHandler(context_ErrorRequest);
    }
    void context_BeginRequest(object sender, EventArgs e)
    {
    }
    void context_ErrorRequest(object sender, EventArgs e)
    {
      HttpApplication ap = sender as HttpApplication;
      var error = ap.Server.GetLastError();
      var code = (error is HttpException) ? (error as HttpException).GetHttpCode() : 500;
      if (code != 404)
      {
      }
      // 写入本地文件，队列或数据库 
      // ...          
      ap.Server.ClearError();
      ap.Response.Write(error.Message);
      ap.Response.End();
    }
    public void Dispose() { }
  }