Winform跨線程操作控件，采用擴充方法适配.NET 2.0，C#封裝委托方法

備忘。

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


//訓示某個方法為擴充方法，或某個類或程式集包含擴充方法。
namespace System.Runtime.CompilerServices
{
    [AttributeUsageAttribute(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Method)]
    public sealed class ExtensionAttribute : Attribute { }
}

namespace 無響應程序
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            button1.MyInvoke(() => { button1.Text = ""; });
        }

    }

    /// <summary>
    /// 擴充方法必須在非泛型靜态類中定義
    /// </summary>
    static class MyExtension
    {

        /// <summary>
        /// 跨線程操作控件，在控件上執行委托。調用方法示例：button1.MyInvoke(() => { button1.Text = ""; });
        /// </summary>
        /// <param name="ctl">控件</param>
        /// <param name="dlg">委托</param>
        public static void MyInvoke(this Control ctl, ThreadStart dlg)
        {
            if (dlg == null) return;
            if (!ctl.IsHandleCreated || ctl.IsDisposed || ctl.Disposing) return;
            if (ctl.InvokeRequired)
                ctl.Invoke(dlg, null);
            else
                dlg();
        }
    }
}