asp.net 图标提取以及图标转换的实例代码

namespace newExtIcon
{
    public partial class MainForm : Form
    {   
        public Assembly asm = Assembly.GetExecutingAssembly();
        public MainForm()
        {
            InitializeComponent();       
        }

        void MainForm_Load(object sender ,EventArgs e)
        {
            lbl_display.Text ="No Work !";   

        }

        void btnExtractClick(object sender, EventArgs e)
        {
            Random rd = new Random();
            openFileDialog1.Filter="应用程序|*.dll;*.exe|所有程序|*.*";
            if(openFileDialog1.ShowDialog()== DialogResult.OK)
            {
                Icon icon = Icon.ExtractAssociatedIcon(openFileDialog1.FileName);
                FileStream fileStream = new FileStream("d:\\"+rd.Next(1,100000)+".ico",FileMode.Create);
                icon.Save(fileStream);
                fileStream.Close();       
                lbl_display.Text="Work Done!";
            }
            else
            {
                return ;
            }
        }

        void BtnChangeClick(object sender, EventArgs e)
        {
            Size sz = new Size(32,32);
            Random rd = new Random();
            openFileDialog1.Filter="图片|*.jpg;*.png;*.bmp|所有程序|*.*";
            //openFileDialog1.Filter="图片|*.jpg;*.png;*.bmp|应用程序|*.dll;*.exe";
            if(openFileDialog1.ShowDialog()== DialogResult.OK)
            {
                using(Bitmap bm = new Bitmap(openFileDialog1.FileName))
                {
                    using(Bitmap IconBM = new Bitmap(bm,sz))
                    {
                        using(Icon icon_t = Icon.FromHandle(IconBM.GetHicon()))
                        {
                            FileStream fileStream = new FileStream("d:\\"+rd.Next(1,100000)+".ico",FileMode.Create);
                            icon_t.Save(fileStream);
                            fileStream.Close();   
                            lbl_display.Text="Work Done!";        
                        }
                    }
                }
            }
            else
            {
                return ;
            }

        }
        void Pic_Click(object sender, System.EventArgs e)
        {
            int int_index = Convert.ToInt32(((PictureBox)sender).Tag) ;
            switch(int_index)
            {
                case 1:
                    this.Close();
                    Application.Exit();
                    break;
                case 2:
                    WindowState = FormWindowState.Minimized;
                    break;
                default :
                    break;

    &