在 c# winform 中设置面板边框厚度
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set panel border thickness in c# winform
提问by rifleon
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
我进行了搜索，结果无法解决我的情况。实际上我有一个面板，我希望面板的边框比 Windows 给出的边框更厚。我需要边框样式
BorderStyle.FixedSingle
thicker.. Thanks before
更厚。。谢谢之前
采纳答案by King King
You have to customize your own Panelwith a little custom painting:
您必须Panel使用一些自定义绘画来自定义自己的绘画：
//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));
}
}
}
Here is the screen shot of panel with thickness of 30:
这是厚度为 的面板的屏幕截图30：
NOTE: The Size of Rectangleis 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.
注意： 的大小Rectangle是在绘制线的中间计算的，假设您绘制的线的厚度为4，则外部偏移量为 2，内部偏移量为 2。
I didn't test the case given by Mr Hans, to fix it simply handle the event SizeChangedfor your panel1like this:
我没有测试先生给出的情况下Hans，解决它简单地处理这个事件SizeChanged你panel1是这样的：
private void panel1_SizeChanged(object sender, EventArgs e){
panel1.Invalidate();
}
You can also setting ResizeRedraw = trueusing Reflectionwithout having to handle the SizeChangedevent as above like this:
您还可以设置ResizeRedraw = trueusingReflection而不必SizeChanged像上面这样处理事件：
typeof(Control).GetProperty("ResizeRedraw", BindingFlags.NonPublic | BindingFlags.Instance)
.SetValue(panel1, true, null);
You may see a little flicker when resizing, just add this code to enable doubleBuffered for your panel1:
调整大小时您可能会看到一些闪烁，只需添加此代码即可为您的 panel1 启用 doubleBuffered：
typeof(Panel).GetProperty("DoubleBuffered",
BindingFlags.NonPublic | BindingFlags.Instance)
.SetValue(panel1,true,null);
回答by dik leatherdale
Create a new, slightly larger panel and set the background colour to Black (or whatever). Place the original panel INSIDE the larger panel.
创建一个新的、稍大的面板并将背景颜色设置为黑色（或其他颜色）。将原始面板放在较大的面板内。
