以前用Delphi开发软件的时候，如果需要在界面上放置一个分隔线，其自带的TBevel可以很好地满足这一要求。现在转到了.NET平台，竟找不到对应的控件（毕竟每次在Paint事件中画太麻烦）。而如果用Panel、GroupBox、Label来间接实现，效果不够理想，并且感觉怪怪的。因此决定自己实现一个分隔线控件，效果如下图所示：
在这里我只将核心代码贴出来，关于创建自定义控件的相关知识可参考MSDN：
ms-help://MS.VSCC.2003/MS.MSDNQTR.2003FEB.2052/vbcon/html/vbconControlCreation.htm
/// <summary>
/// 水平分隔线
/// </summary>
[
ToolboxBitmap(typeof(LineH), "res.LineH.ico"),
Designer(typeof(LineHDesigner))
]
public class LineH : System.Windows.Forms.UserControl
{
//... ...
private void LineH_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g = e.Graphics;
Rectangle r = this.ClientRectangle;
Pen darkPen = new Pen(SystemColors.ControlDark, 1);
Pen LightPen = new Pen(Color.White);
//用暗色调处理上边缘
g.DrawLine(darkPen, r.Left, r.Top, r.Right, r.Top);
//用亮色调处理下边缘
g.DrawLine(LightPen, r.Left, r.Top + 1, r.Right, r.Top + 1);
}
//... ...
}
/// <summary>
/// 垂直分隔线
/// </summary>
[
ToolboxBitmap(typeof(LineV), "res.LineV.ico"),
Designer(typeof(LineVDesigner))
]
public class LineV : System.Windows.Forms.UserControl
{
//... ...
private void LineV_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g = e.Graphics;
Rectangle r = this.ClientRectangle;
Pen darkPen = new Pen(SystemColors.ControlDark, 1);
Pen lightPen = new Pen(Color.White);
//用暗色调处理左边缘
g.DrawLine(darkPen, r.Left, r.Top, r.Left, r.Bottom);
//用亮色调处理右边缘
g.DrawLine(lightPen, r.Left + 1, r.Top, r.Left + 1, r.Bottom);
}
//... ...
}
欲完全实现上图所示效果，可参阅http://blog.csdn.net/doubon/archive/2005/01/18/258314.aspx。