如何给回调函数的Dispatcher.BeginInvoke [英] how to give callback function to the Dispatcher.BeginInvoke

问题描述

我需要使用回调函数做一些后期处理。第任务时的功能开始与Dispatcher.BeginInvoke完成。但是我无法找到任何Dispatcher.BeginInvoke参数接受一个回调。是否有可能得到一个回调函数来Dispatcher.BeginInvoke？

I need to use callback function to do some post procesing tasks when the function started with the Dispatcher.BeginInvoke finishes. However i could not find any parameter in Dispatcher.BeginInvoke to accept a callback. Is it possible to give a callback function to Dispatcher.BeginInvoke?

推荐答案

按的BeginInvoke返回的的DispatcherOperation 对象有一个已完成就可以了事件。订阅该完成时执行操作：

The DispatcherOperation object returned by BeginInvoke has a Completed event on it. Subscribe to that to perform operations upon completion:

var dispatcherOp = Dispatcher.BeginInvoke( /* your method here */);
dispatcherOp.Completed += (s, e) => { /* callback code here */ };

有机会操作将完成您申请之前，这样你就可以测试状态属性结束后还有：

There's a chance the operation will complete before you subscribe, so you can test the Status property for completion after as well:

if (dispatcherOp.Status == DispatcherOperationStatus.Completed) { ... }

这是可能的操作被放弃为好，这样处理/测试中止也可能是合适的。

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