c# - 如何从当前执行的方法中获取 BackgroundWorker 的实例？

Question

我正在使用可以有 n 个实例的后台 worker 。问题是 DoWork 方法(具有“发件人”参数，即 BackgroundWorker)调用产生回调的其他代码 - 因此我没有发件人。

如何确定当前代码运行的 BackgroundWorker？

例如:

private void SetupThread()
{
BackgroundWorker bw = new BackgroundWorker();
bw.DoWork += new DoWorkEventHandler(DoTheWork);
}


private void DoTheWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{

    // I know that sender here can be converted, but thats no good for me
    MyClass.DoSomething(); // This will produce a callback(event) from MyClass
}

private void MethodCalledFromEventCallback()
{
   // Here is where the actual work is being done.  I need to determine which
   // instance of the Backgroundworker is calling it so that i can use the         
   // UpdateProgress method

  // I cannot do this :-(  (BackgroundWorker)System.Threading.Thread.CurrentThread;

}

我可能只是忽略了一些东西(除非线程池是有序的 :-( )

我确信这可以通过 BackgroundWorker 轻松实现……有什么想法吗？

---

编辑

我的描述造成了一些困惑，这里有一些更多的事实:-)1.) 我已经调用了 bw.RunWorkerAsync()2.) 调用事件 MethodCalledFromEventCallback 的类不知道后台线程3.) 我不能(由于设计要求)将 Backgroundworker 作为参数包含在内

谢谢:-)

Answer 1

据我所知，使用后台 worker 最好的方法可能是(假设你到目前为止提到的限制条件):

private void SetupThread()
{
    BackgroundWorker bw = new BackgroundWorker();
    // Assuming you need sender and e. If not, you can just send bw
    bw.DoWork += new DoWorkEventHandler(DoTheWork);
}

private void DoTheWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
    MyClass.Callback = () => 
        {
            ((BackgroundWorker)bw).UpdateProgress(/*send your update here*/);
            MethodCalledFromEventCallback();
        };

    MyClass.DoSomething(); // This will produce a callback(event) from MyClass
}

private void MethodCalledFromEventCallback() 
{ 
    // You've already sent an update by this point, so no background parameter required
}