讨论地址:

结论是IsCompleted的设置被忽略，看代码里注释

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace DelayAndThreadWorkflow{    public class myAsyncResult : IAsyncResult    {        public object AsyncState        {             get;  set;        }        public System.Threading.WaitHandle AsyncWaitHandle        {             get;  set;        }        public bool CompletedSynchronously        {            get;            set;        }        public bool IsCompleted        {            get;            set;        }        public myAsyncResult()        {            IsCompleted = false;            CompletedSynchronously = false;        }    }    public class threadMethod    {        AsyncCallback callback;        IAsyncResult asyncResult;        int n;        int result;        public void myCall(int n)        {            for (int i = 1; i <= n; i++)            {                result = result + i;            }            System.Console.WriteLine("myCall,result:{0}", result);        }        #region        /*          1。如果myAsyncResult.CompletedSynchronously=true指示是同步完成的方法         * 那么WFRuntime就没必要判断myAsyncResult.IsCompleted,会在完成BeginmyCall后马上掉用         * EndmyCall方法          2。如果myAsyncResult.CompletedSynchronously=fasle         * 那么WFRuntime只会根据会在activity回调callback时调用EndmyCall,同样忽略IsCompleted的设置         */        #endregion        public IAsyncResult BeginmyCall(int n, AsyncCallback callback, object asyncState)        {            System.Console.WriteLine("BeginmyCall,n:{0}", n);            this.n = n;            this.callback = callback;            this.asyncResult = new myAsyncResult() { AsyncState = asyncState,IsCompleted=false };            System.Threading.Thread thread = new System.Threading.Thread(new System.Threading.ThreadStart(myProcessThread));            thread.Start();                        return this.asyncResult;        }        public void EndmyCall(IAsyncResult r)        {            Console.WriteLine("EndmyCall,result:{0}", result);        }        public void myProcessThread()        {            Console.WriteLine("myProcessThread");            for (int i = 1; i <= n; i++)            {                result = result + i;                System.Console.WriteLine(i);                System.Threading.Thread.Sleep(500);            }            //(asyncResult as myAsyncResult).IsCompleted = true;            callback(asyncResult);        }    }}