给winform combox加readonly功能(用户可能复制combox中的内容)

    public partial class Form1 : Form     {

        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]         public static extern IntPtr GetWindow(IntPtr hWnd, int uCmd);         int GW_CHILD = 5;

        [DllImport("user32.dll", CharSet = CharSet.Auto)]         public static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);         public const int EM_SETREADONLY = 0xcf;

 

        public Form1()         {             InitializeComponent();

            IntPtr editHandle = GetWindow(comboBox1.Handle, GW_CHILD);             SendMessage(editHandle, EM_SETREADONLY, 1, 0);

        }     }