C# 圆角文本框

如何在winform c中创建文本框的曲线边#

示例文本框：

这段代码是VB

 Protected Overrides Function ProcessCmdKey(ByRef msg _
                    As System.Windows.Forms.Message, _
                    ByVal keyData As System.Windows.Forms.Keys) As Boolean 
    If msg.WParam.ToInt32() = CInt(Keys.Enter) Then 
        SendKeys.Send("{Tab}")
        Return True 
    ElseIf msg.WParam.ToInt32() = CInt(Keys.Decimal) Then 
        SendKeys.Send(",")
        Return True 
    End If 
End Function

下一种方法是实际重写WM_Paint事件，在该事件中完成重绘。它利用API函数GetWindowDC和ReleaseDC获得控件的实际图形，包括非客户端区域

要获得圆角，使用如下所示的方法

---

如何在c#

中创建是一个将VB.net代码转换为c#（或者反过来）的绝佳站点。如果你已经解决了这个问题，不要在问题中包含信息，把它作为一个单独的答案发布出来。

Protected Overrides Sub WndProc(ByRef m As _
          System.Windows.Forms.Message) Handles MyBase.WndProc(m)
    Select Case m.Msg
        Case &HF 'WM_PAINT 
            Dim rect As New Rectangle(0, 0, MyBase.Width, MyBase.Height)
            Dim hDC As IntPtr = GetWindowDC(Me.Handle)
            Dim g As Graphics = Graphics.FromHdc(hDC)
            If Me.Enabled Then 
                g.Clear(Color.White)
            Else 
                g.Clear(Color.FromName("control"))
            End If 
            DrawBorder(g)
            DrawText(g)
            ReleaseDC(Me.Handle, hDC)
            g.Dispose()
        Case &H7, &H8, &H200, &H2A3
        'CMB_DROPDOWN, CMB_CLOSEUP, WM_SETFOCUS, 
        'WM_KILLFOCUS, WM_MOUSEMOVE, 'WM_MOUSELEAVE 
            UpdateState()
    End Select 
End Sub

Private Sub TekenRondeRechthoek(ByVal g As Graphics, _
            ByVal pen As Pen, ByVal rectangle As Rectangle, _
            ByVal radius As Single)
    Dim size As Single = (radius * 2.0!)
    Dim gp As GraphicsPath = New GraphicsPath
    gp.AddArc(rectangle.X, rectangle.Y, size, size, 180, 90)
    gp.AddArc((rectangle.X + (rectangle.Width - size)), _
               rectangle.Y, size, size, 270, 90)
    gp.AddArc((rectangle.X + (rectangle.Width - size)), _
              (rectangle.Y + (rectangle.Height - size)), _
              size, size, 0, 90)
    gp.AddArc(rectangle.X, (rectangle.Y + _
             (rectangle.Height - size)), size, size, 90, 90)
    gp.CloseFigure()
    g.DrawPath(pen, gp)
    gp.Dispose()
End Sub