asp.net 图标提取以及图标转换的实例代码

using system;
using system.collections.generic;
using system.drawing;
using system.windows.forms;
using system.io;
using system.resources;
using system.reflection;
using system.runtime.interopservices;

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;

            }

        }

        void pic_hover(object sender,eventargs e)
        {
            string  name_1 = "btn_close_hightligth.png";
            string name_2 ="btn_mini_highlight.png";
            bitmap bm_1 = new bitmap(asm.getmanifestresourcestream(name_1));
            bitmap bm_2 = new bitmap(asm.getmanifestresourcestream(name_2));
            int int_index = convert.toint32(((picturebox)sender).tag) ;
            switch(int_index)
            {
                case 1:
                    picturebox1.backgroundimage=bm_1;
                    break;
                case 2:
                    picturebox2 .backgroundimage = bm_2;
                    break;
                default :
                    break;

            }
        }
        void pic_leave(object sender,eventargs e)
        {
            string  name_1 = "btn_close_down.png";
            string  name_2 ="btn_mini_down.png";
            bitmap bm_1 = new bitmap(asm.getmanifestresourcestream(name_1));
            bitmap bm_2 = new bitmap(asm.getmanifestresourcestream(name_2));
            //getmainfestresourcestream获取的是流
            int int_index = convert.toint32(((picturebox)sender).tag) ;
            switch(int_index)
            {
                case 1:
                    picturebox1.backgroundimage=bm_1;
                    break;
                case 2:
                    picturebox2 .backgroundimage = bm_2;
                    break;
                default :
                    break;

            }
        }

        private const int wm_nclbuttondown = 0xa1;
        private const int htcaption = 2;

        [dllimport("user32.dll")]
        private static extern int sendmessage (int hwnd, int wmsg, int wparam, int lparam);

        [dllimport("user32.dll")]
        private static extern int releasecapture();

        private void form_mousedown(object sender, system.windows.forms.mouseeventargs e)
        {
            //为当前的应用程序释放鼠标捕获
            releasecapture();
            //发送消息，让系统误以为你在标题拦上按下鼠标
            sendmessage((int)this.handle,wm_nclbuttondown,htcaption,0);
        }
    }
}