如何实现自定义按扭功能？？？？

Question

设置button的region属性就可以了

Answer 1

继承一个button类，重写绘图事件。这样最合适了
网上有写自定义控件的例子

Answer 2

Rectangle rect=this.button1.ClientRectangle;
System.Drawing.Drawing2D.GraphicsPath gPath=new System.Drawing.Drawing2D.GraphicsPath();
int r=15;
gPath.AddLine(rect.Left+r,rect.Top,rect.Right-r,rect.Top);
gPath.AddArc(rect.Right-2*r,rect.Top,2*r,2*r,270,90);
gPath.AddLine(rect.Right,rect.Top+r,rect.Right,rect.Bottom-r);
gPath.AddArc(rect.Right-2*r,rect.Bottom-2*r,2*r,2*r,0,90);
gPath.AddLine(rect.Right-r,rect.Bottom,rect.Left+r,rect.Bottom);
gPath.AddArc(rect.Left,rect.Bottom-2*r,2*r,2*r,90,90);
gPath.AddLine(rect.Left,rect.Bottom-r,rect.Left,rect.Top+r);
gPath.AddArc(rect.Left,rect.Top,2*r,2*r,180,90);
Region reg=new Region(gPath);
this.button1.Region=reg;

Answer 3

private void button1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
System.Drawing.Drawing2D.GraphicsPath buttonPath = 
new System.Drawing.Drawing2D.GraphicsPath(); // Set a new rectangle to the same size as the button's 
// ClientRectangle property.
System.Drawing.Rectangle newRectangle = button1.ClientRectangle; // Decrease the size of the rectangle.
newRectangle.Inflate(-10, -10);
// Draw the button's border.
e.Graphics.DrawEllipse(System.Drawing.Pens.Black, newRectangle); // Increase the size of the rectangle to include the border.
newRectangle.Inflate( 1,  1); // Create a circle within the new rectangle.
buttonPath.AddEllipse(newRectangle);
// Set the button's Region property to the newly created 
// circle region.
button1.Region = new System.Drawing.Region(buttonPath);
}