注：此乃Winform控件，开发环境为.net
2.0
工作需要，我对自带Panel进行了一下呈现上的扩展，方便设置边框效果。先看效果：
说明：
*
只有当原有属性BorderStyle为None时才能应用样式，此时可通过BorderMode设置【不显示、单色、三维】三种边框模式；这是因为BorderStyle为FixedSingle或Fixed3D时，自带边框似乎不属于Panel的一部分，不能控制或清除，我猜应该是底层API负责绘制的，所以唯有在None时才能自由发挥；
* 无论单色或是三维模式，均可通过BorderSide自由启用/禁用各个方位的边框；
* 在单色模式下，可通过BorderColor设置边框颜色，此时设置三维样式（Border3DStyle）无效；
* 在三维模式下，可通过Border3DStyle设置三维样式，此时设置边框颜色（BorderColor）无效；
代码在此：
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;namespace AhDung.Controls
{
/// <summary>
/// 边框模式（无、单色、三维）
/// </summary>
public enum BorderMode { None, Single, ThreeD }/// <summary>
/// 可设置边框样式的Panel
/// </summary>
public class PanelEx : Panel
{
private Color borderColor;
private Border3DStyle border3DStyle;
private ToolStripStatusLabelBorderSides borderSide;
private BorderMode borderMode;[DefaultValue(BorderMode.None), Description("边框模式。可设置单色模式或三维模式")]
public BorderMode BorderMode
{
get { return borderMode; }
set
{
if (borderMode == value) { return; }
borderMode = value;
this.Invalidate();
}
}[DefaultValue(typeof(Color), "Black"), Description("边框颜色。仅当边框为单色模式时有效")]
public Color BorderColor
{
get { return borderColor; }
set
{
if (borderColor == value) { return; }
borderColor = value;
this.Invalidate();
}
}[DefaultValue(Border3DStyle.Etched), Description("边框三维样式。仅当边框为三维模式时有效")]
public Border3DStyle Border3DStyle
{
get { return border3DStyle; }
set
{
if (border3DStyle == value) { return; }
border3DStyle = value;
this.Invalidate();
}
}//之所以不直接用Border3DSide是因为这货不被设计器支持，没法灵活选择位置组合
[DefaultValue(ToolStripStatusLabelBorderSides.All), Description("边框位置。可自由启用各个方位的边框")]
public ToolStripStatusLabelBorderSides BorderSide
{
get { return borderSide; }
set
{
if (borderSide == value) { return; }
borderSide = value;
this.Invalidate();
}
}public PanelEx()
{
this.borderMode = BorderMode.None;
this.borderColor = Color.Black;
this.border3DStyle = System.Windows.Forms.Border3DStyle.Etched;
this.borderSide = ToolStripStatusLabelBorderSides.All;
}protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
if (this.BorderStyle != System.Windows.Forms.BorderStyle.None
|| BorderMode == BorderMode.None
|| BorderSide == ToolStripStatusLabelBorderSides.None)
{ return; }using (Graphics g = e.Graphics)
{
//三维模式
if (this.BorderMode == BorderMode.ThreeD)
{
ControlPaint.DrawBorder3D(g, this.ClientRectangle, this.Border3DStyle, (Border3DSide)BorderSide);//这儿要将ToolStripStatusLabelBorderSides转换为Border3DSide
}
else //单色模式
{
using (Pen pen = new Pen(BorderColor))
{
//若是四条边都启用，则直接画矩形
if (BorderSide == ToolStripStatusLabelBorderSides.All)
{
g.DrawRectangle(pen, 0, 0, this.Width - 1, this.Height - 1);
}
else //否则分别绘制线条
{
if ((BorderSide & ToolStripStatusLabelBorderSides.Top) == ToolStripStatusLabelBorderSides.Top)
{ g.DrawLine(pen, 0, 0, this.Width - 1, 0); }if ((BorderSide & ToolStripStatusLabelBorderSides.Right) == ToolStripStatusLabelBorderSides.Right)
{ g.DrawLine(pen, this.Width - 1, 0, this.Width - 1, this.Height - 1); }if ((BorderSide & ToolStripStatusLabelBorderSides.Bottom) == ToolStripStatusLabelBorderSides.Bottom)
{ g.DrawLine(pen, 0, this.Height - 1, this.Width - 1, this.Height - 1); }if ((BorderSide & ToolStripStatusLabelBorderSides.Left) == ToolStripStatusLabelBorderSides.Left)
{ g.DrawLine(pen, 0, 0, 0, this.Height - 1); }
}
}
}
}
}
}
}
-文毕-
【C#】分享一个可灵活设置边框的Panel,布布扣,bubuko.com