Question

我在按钮单击事件上触发CancelAsync方法，以停止我的Windows窗体代码中的后台工作器。以下是示例代码，

// Windows Form

private: System::Void startButton_Click(System::Object^  sender, System::EventArgs^  e) {
        testBgWorker->RunWorkerAsync();
        }

private: System::Void testBgWorker_DoWork(System::Object^  sender, System::ComponentModel::DoWorkEventArgs^  e) {

            CalculateDistance* calcDistance = new CalculateDistance();
        calcDistance->doCalculations();
         }

private: System::Void stopButton_Click(System::Object^  sender, System::EventArgs^  e) {

            testBgWorker->CancelAsync();
         }

// CalculateDistance.cpp   

void CalculateDistance::doCalculations() {
    for (int i=0; i<1000, i++) 
    {
        // some calculations here
    }
}

如何取消BackgroundWorker（退出循环的）CancelAsync似乎无法完成这项工作。



谢谢。

Answer 1

您需要在计算距离循环中检查取消。在C#中，它看起来是这样的。msdn.com上有一些很好的例子。你需要将backgoundworker标记为支持取消。

 if (worker.CancellationPending)
        {
            e.Cancel = true;
            return "cancelled";
        }

友情链接