向背景工作者发送参数？

Question

假设我想将int参数发送给后台工作者，这如何完成？

private void worker_DoWork(object sender, DoWorkEventArgs e) {

}

我知道什么时候是worker.RunWorkerAsync（）;，我不明白如何在worker_DoWork中定义它应该采用int参数。

Answer 1

您可以这样启动：int value = 123;bgw1.RunWorkerAsync(argument: value);  // the int will be boxed接着private void worker_DoWork(object sender, DoWorkEventArgs e) {   int value = (int) e.Argument;   // the 'argument' parameter resurfaces here   ...   // and to transport a result back to the main thread   double result = 0.1 * value;   e.Result = result;}// the Completed handler should follow this pattern // for Error and (optionally) Cancellation handlingprivate void worker_Completed(object sender, RunWorkerCompletedEventArgs e) {  // check error, check cancel, then use result  if (e.Error != null)  {     // handle the error  }  else if (e.Cancelled)  {     // handle cancellation  }  else  {                double result = (double) e.Result;      // use it on the UI thread  }  // general cleanup code, runs when there was an error or not.}

Answer 2

尽管这是一个已经回答的问题，但我还是会提出另一个选择，即IMO更容易阅读：BackgroundWorker worker = new BackgroundWorker();worker.DoWork += (obj, e) => WorkerDoWork(value, text);worker.RunWorkerAsync();并在处理程序方法上：private void WorkerDoWork(int value, string text) {    ...}

Answer 3

您可以像这样传递多个参数。List<object> arguments = new List<object>();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; arguments.Add(argument 1);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; arguments.Add(argument 1);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; arguments.Add(argument n);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; backgroundWorker2.RunWorkerAsync(arguments);private void worker_DoWork(object sender, DoWorkEventArgs e) {&nbsp; List<object> genericlist = e.Argument as List<object>;&nbsp; extract your multiple arguments from this list and cast them and use them.&nbsp;}