.NET3.5下用Lambda简化跨线程访问窗体控件,避免繁复的delegate,Invoke

1,错误的代码是：

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

namespace WindowsFormsApplication5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private string blog = "http://www.chenjiliang.com/";


        private void Form1_Load(object sender, EventArgs e)
        {
            new System.Threading.Thread(ShowTime).Start();
        }

        private void ShowTime()
        {
            textBox1.Text = DateTime.Now.ToString();
        }
    }
}

 

会看到Cross-thread operation not valid: Control 'textBox1' accessed from a thread other than the thread it was created on.的错误

2，增加一个Public static 类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;


namespace WindowsFormsApplication5
{
    public static class ControlExtention
    {
        public delegate void InvokeHandler();

        public static void SafeInvoke(this Control control, InvokeHandler handler)
        {
            if (control.InvokeRequired)
            {
                control.Invoke(handler);
            }
            else
            {
                handler();
            }
        }
    }
}

 

3，build

4,这样写就好啦

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

namespace WindowsFormsApplication5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private string s = "http://www.chenjiliang.com/";

        private void Form1_Load(object sender, EventArgs e)
        {
            new System.Threading.Thread(ShowTime).Start();
        }

        private void ShowTime()
        {
            this.SafeInvoke(() =>
            {
                textBox1.Text = DateTime.Now.ToString();
            });
        }
    }
}