try
   {
    Graphics grfx=this.CreateGraphics();
    int cx=1;
    int cy=1;
    Pen pen=new Pen(Color.Blue,1);
    Brush brush=new SolidBrush(Color.Red);
    Point [] apt=new Point[5];
    for(int i=0;i<apt.Length;i++)
    {
     double dAngle=(i*0.8-0.5)*Math.PI;
     apt[i]=new Point((int)(cx*(0.25+0.24*Math.Cos(dAngle))),(int)(cy*(0.50+0.48*Math.Sin(dAngle))));
    }
    grfx.FillClosedCurve(brush,apt,FillMode.Alternate,0.1f);
    for(int i=0;i<apt.Length;i++)
    apt[i].X +=cx/2;
    grfx.FillClosedCurve(brush,apt,FillMode.Winding,0.1f);
   
   }
   catch(Exception ex)
   {
    MessageBox.Show(ex.Message);
   }
感觉没有错，可运行时，出不来结果，并且没有错误生成，还望大家帮忙！看看是什么原因！
（此代码写在button的Click事件中）

同样的还有一个画花的：
grfx.DrawBezier(new Pen(Color.Green,10),new Point(0,cy),new Point(0,3*cy/4),new Point(cx/4,cy/4),new Point(cx/2,cy/2));
   float fscale=Math.Min(cx,cy)/2000f;
   grfx.TranslateTransform(cx/2,cy/2);
   grfx.ScaleTransform(fscale,fscale);
   GraphicsPath path=new GraphicsPath();
   path.AddBezier(new Point(0,0),new Point(125,125),new Point(475,125),new Point(600,0));
            path.AddBezier(new Point(600,0),new Point(475,-125),new Point(125,-125),new Point(0,0));
   for(int i=0;i<8;i++)
   {
    grfx.FillPath(Brushes.Red,path);
    grfx.DrawPath(Pens.Black,path);
    grfx.RotateTransform(360/8);
   }
   Rectangle rect=new Rectangle(-150,-150,300,300);
   grfx.FillEllipse(Brushes.Yellow,rect);
   grfx.DrawEllipse(Pens.Black,rect);
真的希望大家帮忙啊！