Question

c#窗体问题 怎样使窗体变成圆角

Answer 1

你可以把窗体FormBorderStyle设置成None,然后用一张有图角的图片做背景，
把窗体的TransparencyKey设置成，圆角的图片处的颜色。这样就可以。

一般的Splash界面（一般软件如adobe加载时的不规则界面的效果）都是这样做的~

Answer 2

using System.Drawing.Drawing2D;
protected override void OnPaint( System.Windows.Forms.PaintEventArgs e )
{
GraphicsPath oPath = new GraphicsPath();
int x=0;
int y=0;
int w=Width;
int h=Height;
int a=40;
Graphics g=CreateGraphics();
oPath.AddArc(x,y,a,a,180,90);
oPath.AddArc(w-a,y,a,a,270,90);
oPath.AddArc(w-a/2,h-a/2,a/2,a/2,0,90);
oPath.AddArc(x,h-a,a,a,90,90);
oPath.CloseAllFigures();
Region=new Region(oPath);
}

Answer 3

需要创建BMP图像并用代码处理！

Answer 4

引用liulaijin的回答：
using System.Drawing.Drawing2D;
protected override void OnPaint( System.Windows.Forms.PaintEventArgs e )
{
GraphicsPath oPath = new GraphicsPath();
int x=0;
int y=0;
int w=Width;
int h=Height;
int a=40;
Graphics g=CreateGraphics();
oPath.AddArc(x,y,a,a,180,90);
oPath.AddArc(w-a,y,a,a,270,90);
oPath.AddArc(w-a/2,h-a/2,a/2,a/2,0,90);
oPath.AddArc(x,h-a,a,a,90,90);
oPath.CloseAllFigures();
Region=new Region(oPath);
}

using System.Drawing.Drawing2D;
protected override void OnPaint( System.Windows.Forms.PaintEventArgs e )
{
GraphicsPath oPath = new GraphicsPath();
int x=0;
int y=0;
int w=Width;
int h=Height;
int a=40;//这是圆角的半径
Graphics g=CreateGraphics();
oPath.AddArc(x,y,a,a,180,90);
oPath.AddArc(w-a,y,a,a,270,90);
oPath.AddArc(w-a,h-a,a,a,0,90); //这个角应该是这样的
oPath.AddArc(x,h-a,a,a,90,90);
oPath.CloseAllFigures();
Region=new Region(oPath);
}