how to open another window form in backgroundworker in c#

Question

i need to run a time consuming process in backgroundworker and in that process i need to open a window too. All work good but when i call a UI in that process, it not allow me to work in that new window it just show waiting and when i cancel the backgroundworker process it not cancel either although i enable workersupportcancel. Here is my code

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        BackgroundWorker worker = sender as BackgroundWorker;
        runCheck();    
    }

    private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        if (e.Error != null)
        {
            MessageBox.Show(e.Error.Message);
        }           
    }
    private void newBtncheck_Click(object sender, RibbonControlEventArgs e)
    {
        backgroundWorker1.RunWorkerAsync();
    }       

 private void newBtncheck_Click(object sender, RibbonControlEventArgs e)
    {
        backgroundWorker1.RunWorkerAsync();
    }
    private void btnStop_Click(object sender, RibbonControlEventArgs e)
    {
        this.backgroundWorker1.CancelAsync();
    }

Answer 1

You need to wrap your code that opens new form in the BeginInvoke() of the calling form.

Put this in your backgroundWorker1_DoWork() method:

BeginInvoke(new Action(()=>{ 
  // place code to open new form here, for example new MyNewForm().Show()
}));

This is assuming your backgroundWorker1_DoWork() is a member of your main form class. If not, you will need to explicitly specify the instance of your main form: mainFormInstance.BeginInovoke(...)

Answer 2

您可以使用Dispatcher要求UI线程打开对话框：（从此处开始 ）

this.Dispatcher.BeginInvoke(new Action(() => ProgressDialog.ShowDialog()));