时间：2021-04-19 08:05:09 | 栏目：.NET代码 | 点击：次
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);
}