C# winform 消息框

一、

1、语法

MessageBox.show();

注意：有返回值，返回值需要ToString(),根据返回值，判断选的那个按钮

2、案例

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            DialogResult dialogResult = MessageBox.Show("测试对话消息框！", "测试测试", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button1);
            string result = dialogResult.ToString();
            if (result == "Yes")
            {
                MessageBox.Show("选择\"是\"按钮", "系统提示1", MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);
            }
            else if (result == "No")
            {
                MessageBox.Show("选择\"否\"按钮", "系统提示2", MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);
            }
            else {
                MessageBox.Show("选择\"取消\"按钮", "系统提示3", MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);
            }


        }
    }
}