System.Web.HttpContext.Current 跟踪分析

public static HttpContext Current

    {

      get

      {

        return ContextBase.Current as HttpContext;

      }

      set

      {

        ContextBase.Current = (object) value;

      }

    }

 

 internal class ContextBase

  {

    internal static object Current

    {

      get

      {

        return CallContext.HostContext;

      }

      [SecurityPermission(SecurityAction.Demand, Unrestricted = true)] set

      {

        CallContext.HostContext = value;

      }

    }



    [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]

    public ContextBase()

    {

    }



    internal static object SwitchContext(object newContext)

    {

      object hostContext = CallContext.HostContext;

      if (hostContext != newContext)

        CallContext.HostContext = newContext;

      return hostContext;

    }

  }

 

 public static Object HostContext 

        {

            [System.Security.SecurityCritical]  // auto-generated

            get

            { 

                Object hC;

                IllogicalCallContext ilcc = Thread.CurrentThread.GetIllogicalCallContext(); 

                hC = ilcc.HostContext; 

                if (hC == null)

                { 

                    LogicalCallContext lcc = GetLogicalCallContext();

                    hC = lcc.HostContext;

                }

                return hC; 

            }

            [System.Security.SecurityCritical]  // auto-generated_required 

            set 

            {

                if (value is ILogicalThreadAffinative) 

                {

                    IllogicalCallContext ilcc = Thread.CurrentThread.GetIllogicalCallContext();

                    ilcc.HostContext = null;

                    LogicalCallContext lcc = GetLogicalCallContext(); 

                    lcc.HostContext = value;

                } 

                else 

                {

                    LogicalCallContext lcc = GetLogicalCallContext(); 

                    lcc.HostContext = null;

                    IllogicalCallContext ilcc = Thread.CurrentThread.GetIllogicalCallContext();

                    ilcc.HostContext = value;

                } 

            }

        } 

 

        internal IllogicalCallContext GetIllogicalCallContext() 

        { 

            return ExecutionContext.IllogicalCallContext;

        }