我需要一个自定义的SynchronizationContext:
我需要这样做,这样我就可以单元测试一些线程代码,这些代码将在实际应用程序中与WinForm对话。
在我写自己的代码之前,我希望有人能给我一个简单的(和小的)实现。
发布于 2012-06-18 21:49:40
这是我前段时间写的,没有版权问题,也没有保证(系统没有投入生产):
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();
}
}
}
发布于 2009-12-11 16:18:24
idesign.net (在页面上搜索自定义同步上下文)有一个SynchronizationContext,它将完成这项工作,但我需要它们更复杂。
发布于 2015-07-30 10:12:25
我有一个类似的需求-单元测试服务器组件,以确认它的回调委托调用被编组到适当的SynchronizationContext上,并提出了以下代码(基于Stephen Toub的博客文章http://blogs.msdn.com/b/pfxteam/archive/2012/01/20/10259049.aspx),我认为它更简单、更通用,因为它使用自己的内部线程来服务Post()
/Send()
请求,而不是依赖于WPF/Winforms/..执行调度。
// A simple SynchronizationContext that encapsulates it's own dedicated task queue and processing
// thread for servicing Send() & Post() calls.
// Based upon http://blogs.msdn.com/b/pfxteam/archive/2012/01/20/10259049.aspx but uses it's own thread
// rather than running on the thread that it's instanciated on
public sealed class DedicatedThreadSynchronisationContext : SynchronizationContext, IDisposable
{
public DedicatedThreadSynchronisationContext()
{
m_thread = new Thread(ThreadWorkerDelegate);
m_thread.Start(this);
}
public void Dispose()
{
m_queue.CompleteAdding();
}
/// <summary>Dispatches an asynchronous message to the synchronization context.</summary>
/// <param name="d">The System.Threading.SendOrPostCallback delegate to call.</param>
/// <param name="state">The object passed to the delegate.</param>
public override void Post(SendOrPostCallback d, object state)
{
if (d == null) throw new ArgumentNullException("d");
m_queue.Add(new KeyValuePair<SendOrPostCallback, object>(d, state));
}
/// <summary> As
public override void Send(SendOrPostCallback d, object state)
{
using (var handledEvent = new ManualResetEvent(false))
{
Post(SendOrPostCallback_BlockingWrapper, Tuple.Create(d, state, handledEvent));
handledEvent.WaitOne();
}
}
public int WorkerThreadId { get { return m_thread.ManagedThreadId; } }
//=========================================================================================
private static void SendOrPostCallback_BlockingWrapper(object state)
{
var innerCallback = (state as Tuple<SendOrPostCallback, object, ManualResetEvent>);
try
{
innerCallback.Item1(innerCallback.Item2);
}
finally
{
innerCallback.Item3.Set();
}
}
/// <summary>The queue of work items.</summary>
private readonly BlockingCollection<KeyValuePair<SendOrPostCallback, object>> m_queue =
new BlockingCollection<KeyValuePair<SendOrPostCallback, object>>();
private readonly Thread m_thread = null;
/// <summary>Runs an loop to process all queued work items.</summary>
private void ThreadWorkerDelegate(object obj)
{
SynchronizationContext.SetSynchronizationContext(obj as SynchronizationContext);
try
{
foreach (var workItem in m_queue.GetConsumingEnumerable())
workItem.Key(workItem.Value);
}
catch (ObjectDisposedException) { }
}
}
https://stackoverflow.com/questions/1882417
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