問題描述

我有一個繼承自 System.Windows.Forms.Button 的自定義按鈕類.

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

我想在我的 winform 項目中使用這個按鈕.

I want to use this button in my winform project.

這個類叫做ConfirmButton"，它用Yes或No顯示確認信息.

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

但問題是當用戶選擇否并確認消息時，我不知道如何停止點擊事件.

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

這是我的課程來源.

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

            }
        }
    }
}

如果用戶從確認消息中選擇否，則按鈕單擊事件不應再觸發.

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

推薦答案

你需要重寫點擊事件.

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);
    }
}

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