[转]C# WinForm 绘制圆角窗体

本文转自：http://blog.csdn.net/Terry001/archive/2008/05/01/2352511.aspx

public   void   SetWindowRegion()    
  {    
  System.Drawing.Drawing2D.GraphicsPath   FormPath;    
  FormPath   =   new   System.Drawing.Drawing2D.GraphicsPath();    
  Rectangle   rect=new   Rectangle(0,22,this.Width,this.Height-22);//this.Left-10,this.Top-10,this.Width-10,this.Height-10);                
  FormPath   =   GetRoundedRectPath(rect,   30);  
  this.Region   =   new   Region(FormPath);    
  }  
  private   GraphicsPath   GetRoundedRectPath(Rectangle   rect,   int   radius)    
  {  
  int   diameter   =   radius;  
  Rectangle   arcRect   =   new   Rectangle(rect.Location,   new   Size(diameter,   diameter));  
  GraphicsPath   path   =   new   GraphicsPath();  
  //   左上角  
  path.AddArc(arcRect,   180,   90);  
  //   右上角  
  arcRect.X   =   rect.Right   -   diameter;  
  path.AddArc(arcRect,   270,   90);  
  //   右下角  
  arcRect.Y   =   rect.Bottom   -   diameter;  
  path.AddArc(arcRect,   0,   90);  
  //   左下角  
  arcRect.X   =   rect.Left;  
  path.AddArc(arcRect,   90,   90);  
  path.CloseFigure();  
  return   path;  
  }  
  protected   override   void   OnResize(System.EventArgs   e)    
  {    
  this.Region   =   null;    
  SetWindowRegion();    
  }

[转]教你一招:构造圆角窗体
http://topic.csdn.net/t/20041128/19/3596094.html

增加命名空间:using System.Drawing.Drawing2D;
添加方法如下:当然各角的点可根据需要确定.
private void Type(Control sender,int p_1,double p_2)
{
GraphicsPath oPath = new GraphicsPath();
oPath.AddClosedCurve(new Point[] {new Point(0,sender.Height / p_1),new Point(sender.Width / p_1,0),new Point(sender.Width - sender.Width / p_1,0),new Point(sender.Width,sender.Height / p_1),new Point(sender.Width,sender.Height - sender.Height / p_1),new Point(sender.Width - sender.Width / p_1,sender.Height),new Point(sender.Width / p_1,sender.Height),new Point(0,sender.Height - sender.Height / p_1)},(float)p_2);
sender.Region = new Region(oPath);
}


在窗体的paint和resize事件中增加:Type(this,20,0.1);
参数20和0.1也可以根据自己的需要调整到最佳效果.