Winform ComboBox如何独立绘制下拉选项的字体颜色
众所周知,cbo1.ForeColor会同时改变cbo1.Text和下拉选项字体颜色。
独立绘制下拉选项字体颜色,ForeColor只对cbo1.Text颜色有效的办法,示例:
privatevoidcb7_DrawItem(objectsender,DrawItemEventArgse) { DrawCboItems(sender,e); } privatevoidcb7_SelectedIndexChanged(objectsender,EventArgse) { SetCboTextColor(sender); } privatevoidSetCboTextColor(objectsender) { ComboBoxcbx=senderasComboBox; if(cbx.Text=="+") cbx.ForeColor=Color.Red; else cbx.ForeColor=Color.Black; } privatevoidDrawCboItems(objectsender,DrawItemEventArgse) { ComboBoxcbo=senderasComboBox; //初始化字体和背景色 PenfColor=newPen(Color.Black); PenbColor=newPen(Color.White); switch(e.Index) {//下拉选项的索引 case1: { fColor=newPen(Color.Red); break; } } e.Graphics.FillRectangle(bColor.Brush,e.Bounds); e.Graphics.DrawString((string)cbo.Items[e.Index],this.Font,fColor.Brush,e.Bounds); }
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