取消按钮上的BackgroundWorker，然后单击另一个表单 [英] Cancel BackgroundWorker on button click on another Form

问题描述

你好，


在我的mainForm中，我有一个BackgroundWorker.启动bgworker的任务时，我调用WaitDialog，完成时将其关闭.我希望在WaitDialog中有一个取消"按钮，单击该按钮时，通知bgworker任务取消该任务.这就是我在mainForm中调用并显示我的waitDlg的方式:

Hello,


In my mainForm I have a BackgroundWorker. I call a WaitDialog when the task for bgworker is started and close it when completed. I want to have a Cancel button in WaitDialog and when clicked, notify the bgworker task to cancel the task. This is how I call and show my waitDlg in mainForm :

currentState = this.CONNECTING;
backgroundWorker1.RunWorkerAsync();
msg = "Connecting...";
waitDlg.set(msg, "");
if (!waitDlg.IsAccessible)
    waitDlg.ShowDialog();

在我的waitDlg中，当用户单击取消"按钮时，目前我设置了一个标志Cancel = true.

我尝试使用EventHadler n cancelbutton并在mainForm中进行处理，但从未调用mainForm的方法.

如何实现这个目标?我花了很多时间在此上，但找不到解决方案.谁能帮我这个.我现在很着急-因为花了很多时间来解决这个问题.

非常感谢您的帮助.

感谢

In my waitDlg, when the user clicks Cancel button, at present I jsut set a flag Cancel = true.

I tried using EventHadler n cancelbutton and that handles in mainForm, but the mainForm''s method is never called.

How to achieve this goal ? I have spent lots of time on this but couldn''t find the solution. Can anyone help me with this. I am kind of in hurry now - as have spend many hrs solving this problem.

Any help is highly appreciated.

Thanks

推荐答案

您应该在返回后台工作程序的主窗体上创建一个公共属性.然后，在进度表中，您应该传递对构造函数中主窗体的引用.在取消按钮事件中，调用bgw的CancelAsync事件，类似这样

You should create a public property on the main form which returns the background worker. Then in your progress form you should pass a reference to the main form in the constructor. In the cancel button event call the bgw''s CancelAsync event, something like this

BackgroundWorker bgw;

        public BackgroundWorker formWorker
        {
            get
            {
                return bgw;
            }
        }

        public frmParent()
        {
            InitializeComponent();
            bgw = new BackgroundWorker();
            bgw.WorkerSupportsCancellation = true;
            bgw.DoWork +=new DoWorkEventHandler(backgroundWorker_DoWork);
            bgw.RunWorkerAsync();
        }

        private void bt_add_Click(object sender, EventArgs e)
        {
            frmProgress progress = new frmProgress(this);
            progress.ShowDialog();
        }

        static void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker backgroundWorker = sender as BackgroundWorker;
            if(backgroundWorker != null)
            {
                while(!backgroundWorker.CancellationPending)
                {
 
                }
                if(backgroundWorker.CancellationPending)
                {
                    MessageBox.Show("Cancelled");
                    e.Cancel = true;

                }
            }
        }

在您的进度表中

In you progress form

frmParent myParent;
        public frmProgress(frmParent myParent)
        {
            InitializeComponent();
            this.myParent = myParent;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            myParent.formWorker.CancelAsync();
        }

希望对您有帮助

Hope this helps

这篇关于取消按钮上的BackgroundWorker，然后单击另一个表单的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！