c# - 寻找自定义 SynchronizationContext 的示例(单元测试需要)

Question

我需要定制SynchronizationContext那:

• 拥有一个运行“Posts”和“Sends”委托(delegate)的线程
• 是否按照发送顺序发送
• 不需要其他方法

我需要这个，这样我就可以对一些线程代码进行单元测试，这些代码将在实际应用程序中与 WinForm 对话。

在我自己写之前，我希望有人能给我指出一个简单(和小)的实现。

Answer 1

这个是我前段时间写的，没有版权问题，也没有保证(系统没有上线):

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Windows.Threading;

namespace ManagedHelpers.Threads
{
    public class STASynchronizationContext : SynchronizationContext, IDisposable
    {
        private readonly Dispatcher dispatcher;
        private object dispObj;
        private readonly Thread mainThread;

        public STASynchronizationContext()
        {
            mainThread = new Thread(MainThread) { Name = "STASynchronizationContextMainThread", IsBackground = false };
            mainThread.SetApartmentState(ApartmentState.STA);
            mainThread.Start();

            //wait to get the main thread's dispatcher
            while (Thread.VolatileRead(ref dispObj) == null)
                Thread.Yield();

            dispatcher = dispObj as Dispatcher;
        }

        public override void Post(SendOrPostCallback d, object state)
        {
            dispatcher.BeginInvoke(d, new object[] { state });
        }

        public override void Send(SendOrPostCallback d, object state)
        {
            dispatcher.Invoke(d, new object[] { state });
        }

        private void MainThread(object param)
        {
            Thread.VolatileWrite(ref dispObj, Dispatcher.CurrentDispatcher);
            Console.WriteLine("Main Thread is setup ! Id = {0}", Thread.CurrentThread.ManagedThreadId);
            Dispatcher.Run();
        }

        public void Dispose()
        {
            if (!dispatcher.HasShutdownStarted && !dispatcher.HasShutdownFinished)
                dispatcher.BeginInvokeShutdown(DispatcherPriority.Normal);

            GC.SuppressFinalize(this);
        }

        ~STASynchronizationContext()
        {
            Dispose();
        }
    }
}