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前面看到一個高手寫的： namespace UnderLineBox { public class UnderLineBox : TextBox { private bool m_underLine; public bool UnderLine { get { return m_underLine; } set { if (this.m_underLine != value) { if (value) { this.BorderStyle = BorderStyle.None; } m_underLine = value; } } } protected override void WndProc(ref Message m) { base.WndProc(ref m); if (m.Msg == 0xf || m.Msg == 0x14 || m.Msg == 0x85) { if (this.BorderStyle == BorderStyle.None) { if (m_underLine) { using (Graphics g = Graphics.FromHwnd(this.Handle)) { g.DrawLine(SystemPens.ControlText, 0, this.Height - 1, this.Width - 1, this.Height - 1);//這里寫你要繪制的形狀。 } } } } } } } |
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