工作流基础多个跟踪参与者工作不一致

在win7下运行的wf4.5和c# v4.0.30319中，我有自定义工作流基础跟踪参与者的麻烦。单个跟踪参与者似乎工作可靠，但一旦我使用第二个跟踪参与者，活动是否被跟踪就变成了一种运气游戏。我已经检查了每一个可能的堆栈溢出的答案，可能每一个可用的谷歌结果。

我已经创建了一个简单的应用程序来演示这种行为。我有一个简单的代码活动:

using System;
using System.Activities;
namespace WorkflowTrackingTestApp
{
    public sealed class CodeActivity1 : CodeActivity
    {
        public InArgument<string> Text { get; set; }
        protected override void Execute( CodeActivityContext context )
        {
            Console.WriteLine( "executing code activity " + typeof( string ).Assembly.ImageRuntimeVersion );
        }
    }
}

它只打印"执行代码活动和c#版本"。

那么我有两个自定义跟踪参与者。请注意，它们都有一个跟踪配置文件，并且配置文件有不同的名称，因为在另一个线程中建议这可能是问题所在。

namespace ActivityLibrary
{
    using System;
    using System.Activities.Tracking;
    public class EventTrackingParticipant0 : TrackingParticipant
    {
        public EventTrackingParticipant0()
        {
            this.TrackingProfile = new TrackingProfile
            {
                Name = "CustomTrackingProfile0",
                Queries =
                {
                    new WorkflowInstanceQuery
                    {
                        // Limit workflow instance tracking records for started and
                        // completed workflow states.
                        States = {WorkflowInstanceStates.Started, WorkflowInstanceStates.Completed},
                    }
                }
            };
        }
        public Action<TrackingRecord> Received { get; set; }
        protected override void Track( TrackingRecord record, TimeSpan timeout )
        {
            if( Received != null )
            {
                Received.BeginInvoke( record, BeginInvokeCallback, Received );
            }
        }
        private void BeginInvokeCallback( IAsyncResult ar )
        {
            ((Action<TrackingRecord>)ar.AsyncState).EndInvoke( ar );
        }
    }
    public class EventTrackingParticipant1 : TrackingParticipant
    {
        public EventTrackingParticipant1()
        {
            this.TrackingProfile = new TrackingProfile
            {
                Name = "CustomTrackingProfile1",
                Queries =
                {
                    new WorkflowInstanceQuery
                    {
                        // Limit workflow instance tracking records for started and
                        // completed workflow states.
                        States = {WorkflowInstanceStates.Started, WorkflowInstanceStates.Completed},
                    }
                }
            };
        }
        public Action<TrackingRecord> Received { get; set; }
        protected override void Track( TrackingRecord record, TimeSpan timeout )
        {
            if( Received != null )
            {
                Received.BeginInvoke( record, BeginInvokeCallback, Received );
            }
        }
        private void BeginInvokeCallback( IAsyncResult ar )
        {
            ((Action<TrackingRecord>)ar.AsyncState).EndInvoke( ar );
        }
    }
}

对于两个配置文件，代码基本上是相同的。

现在进入主程序:

namespace WorkflowTrackingTestApp
{
    using System;
    using System.Activities;
    using ActivityLibrary;
    class Program
    {
        static void Main( string[] args )
        {
            EventTrackingParticipant0 tp0 = new EventTrackingParticipant0();
            tp0.Received = tr => Console.WriteLine( "tracker0 tracking " + tr.EventTime.ToString( CultureInfo.InvariantCulture ) + " " + tr.RecordNumber);
            EventTrackingParticipant1 tp1 = new EventTrackingParticipant1();
            tp1.Received = tr => Console.WriteLine( "tracker1 tracking " + tr.EventTime.ToString( CultureInfo.InvariantCulture ) + " " + tr.RecordNumber );
            Activity workflow1 = new CodeActivity1();
            WorkflowInvoker wfInvoker = new WorkflowInvoker( workflow1 );
            //add tracking participants
            wfInvoker.Extensions.Add( tp0 );
            wfInvoker.Extensions.Add( tp1 );
            wfInvoker.Invoke( );
        }
    }
}

它添加两个跟踪参与者并执行代码活动。以下是一些可能的结果:

executing code activity v4.0.30319
tracker0 tracking 08/26/2015 09:18:50 0
tracker1 tracking 08/26/2015 09:18:50 0
Press any key to continue . . .
executing code activity v4.0.30319
tracker0 tracking 08/26/2015 09:29:41 0
tracker0 tracking 08/26/2015 09:29:41 4
tracker1 tracking 08/26/2015 09:29:41 0
tracker1 tracking 08/26/2015 09:29:41 4
Press any key to continue . . .
executing code activity v4.0.30319
tracker0 tracking 08/26/2015 09:30:08 0
tracker1 tracking 08/26/2015 09:30:08 0
tracker0 tracking 08/26/2015 09:30:08 4
tracker1 tracking 08/26/2015 09:30:08 4
Press any key to continue . . .
executing code activity v4.0.30319
tracker0 tracking 08/26/2015 09:30:25 0
tracker1 tracking 08/26/2015 09:30:25 0
tracker1 tracking 08/26/2015 09:30:25 4
Press any key to continue . . .

有谁知道这种行为的原因是什么吗?

  if( Received != null )
  {
      Received.BeginInvoke( record, BeginInvokeCallback, Received );
  }

  if (Received != null)
      Received(record);