AsyncResult.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Runtime / Remoting / AsyncResult.cs / 1 / AsyncResult.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Interface: AsyncResult 
**
** Purpose: Object to encapsulate the results of an async 
**          operation
**
===========================================================*/
namespace System.Runtime.Remoting.Messaging { 
    using System.Threading;
    using System.Runtime.Remoting; 
    using System; 
    using System.Security.Permissions;
 
[System.Runtime.InteropServices.ComVisible(true)]
    public class AsyncResult : IAsyncResult, IMessageSink
    {
 
        internal AsyncResult(Message m)
        { 
            m.GetAsyncBeginInfo(out _acbd, out _asyncState); 
            _asyncDelegate = (Delegate) m.GetThisPtr();
        } 


        // True if the asynchronous operation has been completed.
        public virtual bool IsCompleted 
        {
            get 
            { 
               return _isCompleted;
            } 
        }
        // The delegate object on which the async call was invoked.
        public virtual Object AsyncDelegate
        { 
            get
            { 
                return _asyncDelegate; 
            }
 
        }

        // The state object passed in via BeginInvoke.
        public virtual Object AsyncState 
        {
            get 
            { 
                return _asyncState;
            } 

        }

        public virtual bool CompletedSynchronously 
        {
            get 
            { 
                return false;
            } 
        }

        public bool EndInvokeCalled
        { 
            get
            { 
                return _endInvokeCalled; 
            }
            set 
            {
                BCLDebug.Assert(!_endInvokeCalled && value,
                                "EndInvoke prevents multiple calls");
 
                _endInvokeCalled = value;
            } 
        } 

        private void FaultInWaitHandle() 
        {
            lock(this) {
                if (_AsyncWaitHandle == null)
                { 
                    _AsyncWaitHandle = new ManualResetEvent(false);
                } 
            } 
        }
 
        public virtual WaitHandle AsyncWaitHandle
        {
            get
            { 
                FaultInWaitHandle();
                return _AsyncWaitHandle; 
            } 
        }
 
        public virtual void SetMessageCtrl(IMessageCtrl mc)
        {
            _mc = mc;
        } 

        [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] 
        public virtual IMessage     SyncProcessMessage(IMessage msg) 
        {
            if (msg == null) 
            {
                _replyMsg = new ReturnMessage(new RemotingException(Environment.GetResourceString("Remoting_NullMessage")), new ErrorMessage());
            }
            else if (!(msg is IMethodReturnMessage)) 
            {
                _replyMsg = new ReturnMessage(new RemotingException(Environment.GetResourceString("Remoting_Message_BadType")), new ErrorMessage()); 
            } 
            else
            { 
                _replyMsg = msg;
            }

            _isCompleted = true; 
            FaultInWaitHandle();
 
            _AsyncWaitHandle.Set(); 
            if (_acbd != null)
            { 
                // NOTE: We are invoking user code here!
                // Catch and Ignore exceptions thrown from async callback user code.
                    _acbd(this);
            } 
            return null;
        } 
 
        [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)]
        public virtual IMessageCtrl AsyncProcessMessage(IMessage msg, IMessageSink replySink) 
        {
            throw new NotSupportedException(
                Environment.GetResourceString("NotSupported_Method"));
        } 

        public IMessageSink NextSink 
        { 
            [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)]
            get 
            {
                return null;
            }
        } 

        public virtual IMessage GetReplyMessage()      {return _replyMsg;} 
 
        private IMessageCtrl          _mc;
        private AsyncCallback         _acbd; 
        private IMessage              _replyMsg;
        private bool                  _isCompleted;
        private bool                  _endInvokeCalled;
        private ManualResetEvent      _AsyncWaitHandle; 
        private Delegate              _asyncDelegate;
        private Object                _asyncState; 
    } 
}

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