C# 异步逻辑到同步调用

Question

我有这个

public Result SomeMethod()
{
    Popup popup = new Popup();

    popup.Closed += PopupClosedHandler;
    popup.ShowPopup();


    // have to return the result from handler.

}

void PopupClosedHandler(EventArgs<PopupEventArgs> args)
{
    Result result = args.Result;
}

我必须阻止 SomeMethod() 调用，直到调用弹出窗口并从处理程序中的 args 返回 Result 。我不知道该怎么做，甚至不知道如何寻找它。谁能引导我走向正确的方向？谢谢

Answer 1

您想使用 EventWaitHandle .

public Result SomeMethod()
{
    _doneHandler = new EventWaitHandle(false, EventResetMode.ManualReset);

    Popup popup = new Popup();

    popup.Closed += PopupClosedHandler;
    popup.ShowPopup();


    // This will wait until it is SET.  You can pass a TimeSpan 
    // so that you do not wait forever.
    _doneHandler.WaitOne();

   // Other stuff after the 'block'

}

private EventWaitHandle _doneHandler;

void PopupClosedHandler(EventArgs<PopupEventArgs> args)
{
    Result result = args.Result;

    _doneHandler.Set();
}