asp.net 图标提取以及图标转换的实例代码(2)

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);
        }
    }
}