How to exit the modal loop after calling "ShowDialog()"

Question

form1.ShowDialog() I have run this code and the code after will not run until the form1 is closed. I wonder how to quit the modal loop without closing form1 using another code. For example : I press a button (named "Button1" ) of form1, then the eventhandler (maybe defined in the class of form1 ) quit the modal loop without closing form1. I wonder the code to solve this problem. Looking forward to your reply!

Answer 1

Hi,@ key li. Welcome to Microsoft Q&A. The ShowDialog method in Windows Forms is designed to create a modal dialog box that suspends the execution of the code in the caller until the dialog box is closed. The modal loop is an integral part of this mechanism.

When you use ShowDialog() to display a form, it runs as a modal dialog, and the code following ShowDialog() won't execute until the dialog is closed.

As David said: If you want to perform actions after showing the dialog without waiting for it to close, you could use Show() instead of ShowDialog().

  private void button1_Click(object sender, EventArgs e)
    {
      // Show the dialog
      using (var dialogForm = new DialogForm())
      {
        // Subscribe to the FormClosed event
        dialogForm.FormClosed += DialogForm_FormClosed;
        // Show the dialog modally
        dialogForm.ShowDialog();
      }
      // Code here will continue executing after the dialog is closed
      // You can perform any additional actions or checks here
      // ...
      button2.PerformClick();
      // Raise the DialogClosed event
      OnDialogClosed(EventArgs.Empty);
    }
    private void DialogForm_FormClosed(object sender, FormClosedEventArgs e)
    {
      // Handle the FormClosed event if needed
      // This method will be called when the dialog is closed
    }
    protected virtual void OnDialogClosed(EventArgs e)
    {
      // Raise the DialogClosed event
      DialogClosed?.Invoke(this, e);
    }
    private void button2_Click(object sender, EventArgs e)
    {
      var dialogForm = new DialogForm();
      
        dialogForm.Show();
     
      MessageBox.Show("string");
    }

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Answer 2

I wonder how to quit the modal loop without closing form1

But that's the way how modal dialogs works.