从写TextBox

从写TextBox 禁止粘贴

using System;

using System.Windows.Forms;





namespace winTest

{

    public class MyTextBox:System.Windows.Forms.TextBox

    {

        public const int WM_PASTE = 0x0302;//粘貼消息 

        public const int WM_CHAR = 0x0102;



        /// <summary>

        /// 禁止粘贴

        /// </summary>

        /// <param name="oMessage"></param>

        protected override void WndProc(ref Message oMessage)

        {

            if (oMessage.Msg == WM_PASTE)

            {

                IDataObject paste = Clipboard.GetDataObject();

                string num = paste.GetData(typeof(string)).ToString().Trim();

                for (int i = 0; i < num.Length; i++)

                {

                    if (!char.IsNumber(num[i]))

                    {

                        return;

                    }

                }

            }

            else if (oMessage.Msg == WM_CHAR)

            {

                Console.WriteLine(oMessage.WParam);

                if ((int)oMessage.WParam != 8)

                {

                    if ((int)oMessage.WParam < 48 || (int)oMessage.WParam > 57)

                    {

                        return;

                    }

                }



            }

            base.WndProc(ref oMessage);

        }



    }

}