1 public partial class CirclePictureBox : PictureBox 2     { 3         public CirclePictureBox() 4         { 5             Circle = true; 6             InitializeComponent(); 7         }         8  9         protected override void OnPaint(PaintEventArgs pe)10         {            11             base.OnPaint(pe);            12         }13 14         //圆形大小随控件大小变化15         protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified)16         {17             if (width > 0 && height > 0)18             {19                 CircleSize = new Size(width, height);20             }21             base.SetBoundsCore(x, y, width, height, specified);22         }23 24         bool _circle;25         [Description(" 获取或设置按钮椭圆效果。"), DefaultValue(true)]26         public bool Circle27         {28             get29             {30                 return _circle;31             }32 33             set34             {35                 if (value)36                 {37                     GraphicsPath gp = new GraphicsPath();38                     gp.AddEllipse(0, 0, _circleSize.Width, _circleSize.Height);//圆形                       39                     this.Region = new Region(gp);40                     this.BorderStyle = BorderStyle.None;41                     this.Invalidate();42                 }43                 _circle = value;44             }45         }46 47         Size _circleSize=new Size(50,50);48         [Description(" 圆形的大小")]49         Size CircleSize50         {51             get52             {53                 return _circleSize;54             }55             set56             {57                 _circleSize = value;58                 Circle = true;59             }60         }61     }