随笔10 - C# WinForm下的只带下边框的TextBox

来源：互联网发布：淘宝模特是怎么入行的编辑：程序博客网时间：2024/06/05 02:44
    /// <summary>    /// 只显示下边框的TextBox控件    /// </summary>    public class BottomTextBox : TextBox    {        /// <summary>         /// 获得当前进程，以便重绘控件         /// </summary>         /// <param name="hWnd"></param>         /// <returns></returns>         [System.Runtime.InteropServices.DllImport("user32.dll")]        static extern IntPtr GetWindowDC(IntPtr hWnd);        /// <summary>        /// 释放控件        /// </summary>        /// <param name="hWnd"></param>        /// <param name="hDC"></param>        /// <returns></returns>        [System.Runtime.InteropServices.DllImport("user32.dll")]        static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);        /// <summary>        /// 重绘TextBox        /// </summary>        /// <param name="m"></param>        protected override void WndProc(ref Message m)        {            base.WndProc(ref m);            try            {                if (m.Msg != 0xf && m.Msg != 0x133)                {                    return;                }                IntPtr hDC = GetWindowDC(m.HWnd);                if (hDC.ToInt32() == 0)                {                    return;                }                Pen pen = new Pen(Color.Black, 2.0f);                //绘制边框                    System.Drawing.Graphics g = Graphics.FromHdc(hDC);                g.DrawLine(pen, 0, this.Height, this.Width, this.Height);                pen.Dispose();                //返回结果                 m.Result = IntPtr.Zero;                //释放                 ReleaseDC(m.HWnd, hDC);                this.BackColor = SystemColors.Control;                this.BorderStyle = BorderStyle.None;            }            catch { }        }    }