Winform简单异步委托例子

using System;
using System.Threading;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    //定义委托
    public delegate string TestMethod();
    public delegate void AllForm(string text);

    public partial class Form1 : Form
    {
        AutoResetEvent testEvent = new AutoResetEvent(false);
        AllForm _allForm = null;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            TestMethod method = new TestMethod(Method1);
            string str = method();
            richTextBox1.AppendText("同步操作执行完成：" + str + "\r\n");

            method = new TestMethod(Method2);
            IAsyncResult result = method.BeginInvoke(new AsyncCallback(Method2CallBack), method);

            //阻止当前线程方法之一
            //testEvent.WaitOne();

            richTextBox1.AppendText("this is button1_Click \r\n");
        }

        public string Method1()
        {
            return "Method1";
        }

        public string Method2()
        {
            int k = 10;
            int count = 0;
            for (; k < 1000; k++)
            {
                count += k;
                Thread.Sleep(1);
            }
            return "Method2 " + count;
        }

        public void Method2CallBack(IAsyncResult iar)
        {
            TestMethod test = iar.AsyncState as TestMethod;
            string str = test.EndInvoke(iar);
            if (null != _allForm)
                richTextBox1.Invoke(_allForm, string.Format("异步执行完成调用回调方法 {0}\r\n", str));
            //testEvent.Set();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            _allForm = new AllForm(delegate(string text)
            {
                richTextBox1.AppendText(text);
            });
        }
    }
}