C#实现位图转换成图标的方法

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace WindowsApplication2{  public partial class Form23 : Form  {    public Form23()    {      InitializeComponent();    }    private void button1_Click(object sender, EventArgs e)    {      Bitmap bmp = new Bitmap(@"d:/我的文档/桌面/ico/watermark.bmp");      IntPtr hIcon = bmp.GetHicon();      Icon icon=Icon.FromHandle(hIcon);      this.Icon = icon;      Graphics g = this.CreateGraphics();      //g.DrawIcon(icon, this.ClientRectangle);      g.DrawIconUnstretched(icon, this.ClientRectangle);    }  }}