How to cancel winform button click event?

问题:

I have a custom button class inherited from System.Windows.Forms.Button.

I want to use this button in my winform project.

This class is called "ConfirmButton", and it shows confirm message with Yes or No.

But the problem is that I do not know how to stop click event when user selected No with confirm message.

Here is my class source.

using System;
using System.ComponentModel;
using System.Windows.Forms;

namespace ConfirmControlTest
{
    public partial class ConfirmButton : System.Windows.Forms.Button
    {
        public Button()
        {
            InitializeComponent();

            this.Click  += Button_Click;
        }

        void Button_Click(object sender, EventArgs e)
        {
            DialogResult res    = MessageBox.Show("Would you like to run the command?"
                , "Confirm"
                , MessageBoxButtons.YesNo
                );
            if (res == System.Windows.Forms.DialogResult.No)
            {
                // I have to cancel button click event here

            }
        }
    }
}

If user select No from confirm message, then the button click event should not fire anymore.

回答1:

You need to override the click event.

class ConfirmButton:Button
    {
    public ConfirmButton()
    {

    }

    protected override void OnClick(EventArgs e)
    {
        DialogResult res = MessageBox.Show("Would you like to run the command?", "Confirm", MessageBoxButtons.YesNo
            );
        if (res == System.Windows.Forms.DialogResult.No)
        {
            return;
        }
        base.OnClick(e);
    }
}

回答2:

Here's another way to deal with this general kind of problem. (This is not meant as competition to the previous answer, but just food for thought.) Turn the dialogResult property of your button to none then handle it in the code. An OK button example here:

private void OKUltraButton_Click(object sender, Eventargs e)
{
    //Check for problem here, if true then...
        return;
    }

    //Set Dialog Result and manually close the form
    this.DialogResult = System.Windows.Forms.DialogResult.OK;
    this.Close();
}