C# Tips 2------ToolStripSplitButton's 'Checked' property

   ToolStripSplitButton 的button 部分没有Checked propery，下列方法简单的解决这个问题：

     在button 的checkd 时，额外绘制一些图形，效果如下：

        

 

   1: using System.Drawing;

   2: using System.Drawing.Drawing2D;

   3: using System.Windows.Forms;

   4: using System.Windows.Forms.VisualStyles;

   5:  

   6: namespace  SplitButton

   7: {

   8:     public class ToolStripSplitButtonEx : ToolStripSplitButton

   9:     {

  10:         private bool @checked = false;

  11:       

  12:         public ToolStripSplitButtonEx()

  13:         {

  14:         }

  15:  

  16:         public bool Checked

  17:         {

  18:             get { return @checked; }

  19:             set

  20:             {

  21:                 @checked = value;

  22:                 Invalidate();

  23:             }

  24:         }

  25:  

  26:  

  27:         protected override void OnPaint(PaintEventArgs e)

  28:         {

  29:             if (@checked)

  30:             {

  31:                     Rectangle rect = ButtonBounds;

  32:                     using (Brush br = new LinearGradientBrush(rect,

  33:                                                               ProfessionalColors.ButtonCheckedGradientBegin,

  34:                                                               ProfessionalColors.ButtonCheckedGradientEnd,

  35:                                                               LinearGradientMode.Vertical))

  36:                     {

  37:                         e.Graphics.FillRectangle(br, rect);

  38:                     }

  39:  

  40:                     rect.Inflate(-1, -1);

  41:                     e.Graphics.DrawRectangle(Pens.Black, rect);

  42:                

  43:             }

  44:             base.OnPaint(e);

  45:         }

  46:     }

  47: }

Refences：

1.http://episteme.arstechnica.com/groupee/forums/a/tpc/f/6330927813/m/157009688731