如何在窗体上画一条直线？

Question

查一下帮助，定义一个Graphics对象，用GDI+

Answer 1

private void Line3d_Paint(object sender,System.Windows.Forms.PaintEventArgs e)
{
System.Drawing.Pen myPen =new Pen(Color.Black,1);
myPen.Width= linewidth;
//e.Graphics.Clear(this.BackColor);
switch (lineStyle)
{
case LineStyleMode.InSide :
switch (lineType)
{
case LineTypeMode.VLine:
myPen.Color=Color.Gray;
e.Graphics.DrawLine(myPen,0,2,this.Width,2);
myPen.Color=Color.White;
e.Graphics.DrawLine(myPen,0,3,this.Width,3);
break;
case LineTypeMode.HLine:
myPen.Color=Color.Gray;
e.Graphics.DrawLine(myPen,2,0,2,this.Height);
myPen.Color=Color.White;
e.Graphics.DrawLine(myPen,3,0,3,this.Height);
break;
default:
break;
}
break;
case LineStyleMode.OutSide :
switch (lineType)
{
case LineTypeMode.VLine:
myPen.Color=Color.White;
e.Graphics.DrawLine(myPen,0,2,this.Width,2);
myPen.Color=Color.Gray;
e.Graphics.DrawLine(myPen,0,3,this.Width,3);
break;
case LineTypeMode.HLine:
myPen.Color=Color.White;
e.Graphics.DrawLine(myPen,2,0,2,this.Height);
myPen.Color=Color.Gray;
e.Graphics.DrawLine(myPen,3,0,3,this.Height);
break;
default:
break;
}
break;
}
}

Answer 2

to: jmlmj(jmlmj)
  这个方法怎麽才能运行啊？？