在c#winform中设置面板边框的厚度 [英] set panel border thickness in c# winform

问题描述

我正在搜索，结果无法解决我的情况. 实际上，我有一个面板，并且我希望该面板的边框比Windows的边框厚. 我需要BorderStyle

I have searching and the result cannot solve my case. Actually I have a panel and I want the panel have thicker border than Windows given. I need BorderStyle

BorderStyle.FixedSingle

更厚.. 之前谢谢

推荐答案

您必须使用一些自定义绘画来自定义自己的Panel:

You have to customize your own Panel with a little custom painting:

//Paint event handler for your Panel
private void panel1_Paint(object sender, PaintEventArgs e){ 
  if(panel1.BorderStyle == BorderStyle.FixedSingle){
     int thickness = 3;//it's up to you
     int halfThickness = thickness/2;
     using(Pen p = new Pen(Color.Black,thickness)){
       e.Graphics.DrawRectangle(p, new Rectangle(halfThickness,
                                                 halfThickness,
                                                 panel1.ClientSize.Width-thickness,
                                                 panel1.ClientSize.Height-thickness));
     }
  }
}

这是厚度为30的面板的屏幕截图:

Here is the screen shot of panel with thickness of 30:

注意:Rectangle的大小是在绘图线的中间计算的，假设您绘制的线条的厚度为4，则外部偏移量为2，内部偏移量为2

NOTE: The Size of Rectangle is calculated at the middle of the drawing line, suppose you draw line with thickness of 4, there will be an offset of 2 outside and 2 inside.

我没有测试Hans先生给出的情况，要解决该问题，只需为您的panel1处理事件SizeChanged，如下所示:

I didn't test the case given by Mr Hans, to fix it simply handle the event SizeChanged for your panel1 like this:

private void panel1_SizeChanged(object sender, EventArgs e){
   panel1.Invalidate();
}

您还可以使用Reflection设置ResizeRedraw = true，而不必像上面这样处理SizeChanged事件:

You can also setting ResizeRedraw = true using Reflection without having to handle the SizeChanged event as above like this:

typeof(Control).GetProperty("ResizeRedraw", BindingFlags.NonPublic | BindingFlags.Instance)
               .SetValue(panel1, true, null);

调整大小时，您可能会看到一点闪烁，只需添加以下代码即可为panel1启用doubleBuffered:

You may see a little flicker when resizing, just add this code to enable doubleBuffered for your panel1:

typeof(Panel).GetProperty("DoubleBuffered",
                          BindingFlags.NonPublic | BindingFlags.Instance)
             .SetValue(panel1,true,null);

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