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：

private void cb7_DrawItem(object sender, DrawItemEventArgs e){ DrawCboItems(sender, e);}private void cb7_SelectedIndexChanged(object sender, EventArgs e){ SetCboTextColor(sender);}private void SetCboTextColor(object sender){ ComboBox cbx = sender as ComboBox; if (cbx.Text == "+") cbx.ForeColor = Color.Red; else cbx.ForeColor = Color.Black;}private void DrawCboItems(object sender, DrawItemEventArgs e){ ComboBox cbo = sender as ComboBox; //初始化字体和背景色 Pen fColor = new Pen(Color.Black); Pen bColor = new Pen(Color.White); switch (e.Index) {　　　　 //下拉选项的索引 　　case 1: 　　{ 　　fColor = new Pen(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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