C# 一种不阻塞的 MessageBox 用法

主界面一个测试按钮。

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

namespace WindowsFormsApp2_TestMessageBox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            m_process = new TProcess();
            m_process.MessageBoxShowHandler = MessageBoxShow;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
        }

        private TProcess m_process;

        private void button1_Click(object sender, EventArgs e)
        {
            m_process.Start();
        }

        public DialogResult MessageBoxShow(string msg)
        {
            return MessageBox.Show(msg, "hello", MessageBoxButtons.YesNo);
        }
    }

    class TProcess
    {
        public TProcess()
        {

        }
        public Func<string, DialogResult> MessageBoxShowHandler;

        public void Start()
        {
            Thread m_Th = new Thread(new ThreadStart(() => { MessageBoxShow("Hello Hi 你好！"); }));
            m_Th.IsBackground = true;
            m_Th.Start();
        }

        public void MessageBoxShow(string msg)
        {
            MessageBox.Show("第一");
           

            DialogResult result = DialogResult.None;
            Task.Run(() =>
            {
                if (MessageBoxShowHandler != null)
                {
                    result = /*MessageBoxShowHandler(msg)*/MessageBox.Show(msg, "Task 内部测试", MessageBoxButtons.YesNo);
                }
            });
            Task.Run(() =>
            {
                if (MessageBoxShowHandler != null)
                {
                    //result = MessageBoxShowHandler(msg);
                    result = (DialogResult)(MessageBoxShowHandler?.Invoke(msg + "1"));
                }
            });

            while (true)
            {
                if (result == DialogResult.Yes)
                {
                    Console.WriteLine("Yes");
                    break;
                }
            }
        }       
    }
}

如果这里多次调用，会弹出多个窗口，如果在一个循环里面要注意处理。

Task.Run(() =>
{
    if (MessageBoxShowHandler != null)
    {
        result = /*MessageBoxShowHandler(msg)*/MessageBox.Show(msg, "Task 内部测试", MessageBoxButtons.YesNo);
    }
});