?? ToolStripSplitButton 的button 部分沒有Checked propery，下列方法簡(jiǎn)單的解決這個(gè)問題：

???? 在button 的checkd 時(shí)，額外繪制一些圖形，效果如下：

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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

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轉(zhuǎn)載于:https://www.cnblogs.com/janyou/archive/2008/09/26/1299283.html

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