获取指定文件的图标

实现：

[System.Runtime.InteropServices.DllImport("shell32")]
   private static extern IntPtr ExtractAssociatedIcon(IntPtr hInst,string lpIconPath,ref int lpiIcon);
   
   
  static IntPtr hIcon;
   
   
   private void Form1_Load(object sender, System.EventArgs e)
   { 
 
        int IconIndex=0;
        hIcon=ExtractAssociatedIcon(this.Handle,Application.ExecutablePath,ref IconIndex);
   }
  
  
 //在窗体上画出来
   private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
   { 
 
        Icon icon=Icon.FromHandle(hIcon);
        e.Graphics.DrawIcon(icon,10,10);
   }

注解：

HICON ExtractAssociatedIcon(          HINSTANCE hInst,      应用程序实例 
     LPTSTR lpIconPath,    文件的全路径
     LPWORD lpiIcon        文件中icon的索引
 );
 If the function succeeds, the return value is an icon handle