c# - 过期异步调用操作

Question

我有一个经典的异步消息调度问题。本质上，我需要异步发送消息，然后在发送完成时捕获消息响应。问题是，我似乎无法弄清楚如何使任何一个请求周期自行过期和短路。

这是我目前正在使用的模式示例:

为调用定义委托(delegate)

private delegate IResponse MessageDispatchDelegate(IRequest request);

通过回调发送消息

var dispatcher = new MessageDispatchDelegate(DispatchMessage);
dispatcher.BeginInvoke(requestMessage, DispatchMessageCallback, null);

发送消息

private IResponse DispatchMessage(IRequest request)
{
  //Dispatch the message and throw exception if it times out
}

将调度结果作为响应或异常获取

private void DispatchMessageCallback(IAsyncResult ar)
{
  //Get result from EndInvoke(r) which could be IResponse or a Timeout Exception
}

我想不通的是如何在 DispatchMessage 方法中干净地实现超时/短路过程。任何想法将不胜感激

Answer 1

        var dispatcher = new MessageDispatchDelegate(DispatchMessage);

        var asyncResult = dispatcher.BeginInvoke(requestMessage, DispatchMessageCallback, null);
        if (!asyncResult.AsyncWaitHandle.WaitOne(1000, false))
        {
             /*Timeout action*/
        }
        else
        {
            response = dispatcher.EndInvoke(asyncResult);
        }