AsyncAutoResetEvent在WCF异步方法中不起作用

Question

我使用Visual Studio 2017社区版本（使用TAP）创建了WCF服务。我使用了Microsoft.VisualStudio.Threading参考中的AsyncAutoResetEvent，但似乎在调用Set函数后没有收到此等待句柄的信号。该服务托管在控制台应用程序中。但是，由NonBlockingConsole.WriteLine生成的跟踪可以正确显示。

服务器：

AsyncAutoResetEvent aare = new AsyncAutoResetEvent(false);
public async Task<string> TestfuncAsync()
{
    string strRet = "finished";
    NonBlockingConsole.WriteLine("before autoresetevent");
    await aare.WaitAsync();
    NonBlockingConsole.WriteLine("after autoresetevent");  //is not traced even if asyncautoresetevent is set
    return strRet;
}

void SetEvent()
{
    aare.Set();
    NonBlockingConsole.WriteLine("auto reset event set");
}

客户端界面：

private async void button1_Click(object sender, EventArgs e)
{
    string value = await client.TestfuncAsync();
    ...
}

private void button2_Click(object sender, EventArgs e)
{
    client.SetEvent();
}

NonBlockingConsole类：（从 Does Console.WriteLine block? 重用）

public static class NonBlockingConsole
{
    private static BlockingCollection<string> m_Queue = new BlockingCollection<string>();
    static NonBlockingConsole()
    {
        var thread = new Thread(
            () =>
            {
                while (true) Console.WriteLine(m_Queue.Take());
            }
            );
        thread.IsBackground = true;
        thread.Start();
    }
    public static void WriteLine(string value)
    {
        value = DateTime.Now.ToString("<HH:mm:ss.fff>") + " " + value + " <ThreadID>: " + Thread.CurrentThread.ManagedThreadId.ToString();
        m_Queue.Add(value);
    }
}