c#異步Begininvoke使用隨筆

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WindowsFormsApplication1
{
    public class delegateclass
    {
        private delegate int Dothread();
        static Dothread dothread = new Dothread(work);

        public static void start()
        {
            AsyncCallback backCall = new AsyncCallback(backcall);

            dothread.BeginInvoke(backCall, "我是異步調用的parameter");//第一個參數是調用work方法的參數，第二個是回調函數，第三個是需要傳到回調函數里的參數可以是Object類型
        }
        /// <summary>
        ///這個是委托調用程序
        /// </summary>
        private static int work()
        {
            System.Windows.Forms.MessageBox.Show("我是委托調用程序");
            return 999;
            
        }
        /// <summary>
        /// 回調函數
        /// </summary>
        /// <param name="parameter"></param>
        /// <returns></returns>
        private static int backcall(int parameter)
        {
            System.Windows.Forms.MessageBox.Show("這是一個回調函數");
            return 0;
        
        }
        private static void backcall(IAsyncResult parameter)
        {
            int result=dothread.EndInvoke(parameter);
            System.Windows.Forms.MessageBox.Show("這是一個回調函數");
            System.Windows.Forms.MessageBox.Show(result.ToString());
            System.Windows.Forms.MessageBox.Show(parameter.AsyncState.ToString());


        }
    }

}

上面是建立的一個類，因時間不多，命名比較隨意。

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            delegateclass.start();
        }
    }
}