WPF：如何使用BackgroundWorker处理错误 [英] WPF: How to handle errors with a BackgroundWorker

问题描述

对于Windows客户端编程，我有点新手。我有一个后台工作者有一个DoWork事件和一个RunCompleted事件连线。如果在DoWork中抛出异常，我想更改我的UI，但是我不能因为它在一个不同的线程。我可以将错误传达给RunCompleted，但这并不能帮助我。

解决方案

调用Dispatcher.BeginInvoke。基本上，你需要这样的代码：

  void UpdateState（WhatEverType someObject）
 {
 if（！ Dispatcher.CheckAccess（））
 {
 Dispatcher.BeginInvoke（DispatcherPriority.Normal，new Action（（）=> UpdateState（someObject））; 
} 
 else 
 {
 //使UI改变在这里
} 
} 
  

I am a bit of a newbie when it comes to windows client programming. I have a background worker that has a DoWork event and a RunCompleted event wired up. If an exception gets thrown in DoWork, I want to make changes to my UI, however, I cant because it is in a different thread. I can communicate the error to RunCompleted, but that doesn't help me either.

解决方案

call Dispatcher.BeginInvoke. Basically, you want code like this:

void UpdateState(WhatEverType someObject)
{
    if (! Dispatcher.CheckAccess())
    {
        Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(()=>UpdateState(someObject));
    }
    else
    {
        //make the UI changes here.
    }
}

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