如何使BackgroundWorker的返回一个对象

问题描述

我需要让的RunWorkerAsync（）返回列表与LT; FileInfo的＆GT; 。我怎样才能从后台工作返回一个对象？

I need to make RunWorkerAsync() return a List<FileInfo>. How can I return an object from a background worker?

推荐答案

在对的BackgroundWorker 的DoWork 事件处理程序>（这是工作背景发生）有一种说法 DoWorkEventArgs 。这个对象有一个公共财产的对象结果。当你的工人已经产生的结果（在你的情况下，列表＆LT; FileInfo的＆GT; ），设置 e.Result 来这和回报。

In your DoWork event handler for the BackgroundWorker (which is where the background work takes place) there is an argument DoWorkEventArgs. This object has a public property object Result. When your worker has generated its result (in your case, a List<FileInfo>), set e.Result to that, and return.

现在，你的BackgroundWorker已经完成了它的任务，它触发 RunWorkerCompleted 事件，其中有一个 RunWorkerCompletedEventArgs 对象一个参数。 RunWorkerCompletedEventArgs.Result 将包含从结果你的的BackgroundWorker 。

Now that your BackgroundWorker has completed its task, it triggers the RunWorkerCompleted event, which has a RunWorkerCompletedEventArgs object as an argument. RunWorkerCompletedEventArgs.Result will contain the result from your BackgroundWorker.

例如：

private void bgw_DoWork(object sender, DoWorkEventArgs e)
{
    int result = 2+2;
    e.Result = result;
}

private void bgw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    int result = (int)e.Result;
    MessageBox.Show("Result received: " + result.ToString());
}

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