取消e.result中的后台工作程序异常 [英] cancel background worker exception in e.result

问题描述

我的后台工作者遇到了严重的问题.如果任务正常结束，则代码工作正常.当我取消后台任务时，在e.Result的RunWorkerCompleted函数中得到了system.invalidoperationexception.怎么了?谢谢.

i have a serious problem with background worker. code is working if task is ending regular. when i cancel the background task i get an system.invalidoperationexception in the RunWorkerCompleted function for e.Result. what is wrong? thank you.

这是我的鳕鱼:

private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
  if (backgroundWorker.CancellationPending == true)
    e.Cancel = true;
  e.Result = resultList;
}


private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
  if (e.Error != null)
    List<Object> resultList = (List<Object>)e.Result;
} 

推荐答案

这是设计使然，当取消取消DoWork或引发异常时，将抛出Result属性getter.只需检查一下即可:

This is by design, the Result property getter will throw when DoWork was cancelled or threw an exception. Simply check for that:

private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    if (!e.Cancelled && e.Error == null) {
       List<Object> resultList = (List<Object>)e.Result;
       // etc..
    }
} 

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