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问题描述

我的Visual Studio 2012和异步测试,需要一个同步上下文。结果
但MSTest的默认同步上下文为空。结果
我想测试作为具有同步上下文WPF-或WinForms的UI线程运行。结果
什么是最好的方法,以一个SynchronizationContext的添加到测试线程?

  [TestMethod的]
    公共异步任务MyTest的()
    {
        Assert.IsNotNull(SynchronizationContext.Current);
        等待MyTestAsync();
        DoSomethingOnTheSameThread();
    }


解决方案

使用从帕纳约蒂斯Kanavos和斯蒂芬·克利里的信息,我可以写我的testmethods是这样的:

  [TestMethod的]
    公共无效MyTest的()
    {
      Helper.RunInWpfSyncContext(异步()=>
      {
        Assert.IsNotNull(SynchronizationContext.Current);
        等待MyTestAsync();
        DoSomethingOnTheSameThread();
      });
    }

内code现在运行在一个WPF同步上下文并处理与用于MSTest的所有异常。
辅助方法是从斯蒂芬Toub:

 使用System.Windows.Threading程序; //调度WPF程序集WindowsBase公共静态无效RunInWpfSyncContext(Func键<任务>功能)
{
  如果(函数== NULL)抛出新的ArgumentNullException(功能);
  VAR prevCtx = SynchronizationContext.Current;
  尝试
  {
    VAR syncCtx =新DispatcherSynchronizationContext();
    SynchronizationContext.SetSynchronizationContext(syncCtx);    VAR任务=()的函数;
    如果(任务== NULL)抛出新的InvalidOperationException异常();    VAR帧=新DispatcherFrame();
    VAR T2 = task.ContinueWith(X => {frame.Continue = FALSE;},TaskScheduler.Default);
    Dispatcher.PushFrame(架); //执行所有任务,直到frame.Continue ==假    task.GetAwaiter()调用getResult()。 //当任务失败重新抛出异常
  }
  最后
  {
    SynchronizationContext.SetSynchronizationContext(prevCtx);
  }
}

I have Visual Studio 2012 and an asynchronous test that needs a synchronization context.
But the default synchronization context of MSTest is null.
I would like to test as running on a WPF- or WinForms-UI thread that has a synchronization context.
What's the best method to add a SynchronizationContext to the test thread ?

    [TestMethod]
    public async Task MyTest()
    {
        Assert.IsNotNull( SynchronizationContext.Current );
        await MyTestAsync();
        DoSomethingOnTheSameThread();
    }
解决方案

Using the informations from Panagiotis Kanavos and Stephen Cleary, I can write my testmethods like this:

    [TestMethod]
    public void MyTest()
    {
      Helper.RunInWpfSyncContext( async () =>
      {
        Assert.IsNotNull( SynchronizationContext.Current );
        await MyTestAsync();
        DoSomethingOnTheSameThread();
      });
    }

The inner code now runs in a WPF synchronization context and handles all exceptions as used for MSTest.The Helper method is from Stephen Toub:

using System.Windows.Threading; // WPF Dispatcher from assembly 'WindowsBase'

public static void RunInWpfSyncContext( Func<Task> function )
{
  if (function == null) throw new ArgumentNullException("function");
  var prevCtx = SynchronizationContext.Current;
  try
  {
    var syncCtx = new DispatcherSynchronizationContext();
    SynchronizationContext.SetSynchronizationContext(syncCtx);

    var task = function();
    if (task == null) throw new InvalidOperationException();

    var frame = new DispatcherFrame();
    var t2 = task.ContinueWith(x=>{frame.Continue = false;}, TaskScheduler.Default);
    Dispatcher.PushFrame(frame);   // execute all tasks until frame.Continue == false

    task.GetAwaiter().GetResult(); // rethrow exception when task has failed 
  }
  finally
  { 
    SynchronizationContext.SetSynchronizationContext(prevCtx);
  }
}

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10-11 20:15