调用Combobox的DrawItem和MeasureItem事件设置项字体的颜色和大小以及项的高度和宽度

 1 //窗体上添加一个名为comboBox2的combobox
 2private void Form1_Load(object sender, EventArgs e)
 3{
 4            this.comboBox2.DrawMode = DrawMode.OwnerDrawFixed;
 5            this.comboBox2.DataSource = new String[] { "One", "Two", "Three" };
 6
 7            this.comboBox2.MeasureItem+=new MeasureItemEventHandler(comboBox2_MeasureItem);
 8            this.comboBox2.DrawItem += new DrawItemEventHandler(comboBox2_DrawItem);
 9}



/**//// <summary>
/// 设置文字底框的高度和宽度
/// </summary>
private void comboBox2_MeasureItem(object sender, MeasureItemEventArgs e)
{

           //根据项的索引设置底框高度
            switch (e.Index)
            {
                case 0:
                    e.ItemHeight = 15;
                    break;
                case 1:
                    e.ItemHeight = 20;
                    break;
                case 2:
                    e.ItemHeight = 25;
                    break;
            }
            e.ItemWidth = 20;//设置项的宽度
}

/**//// <summary>
/// 设置文字的颜色，也可以设置大小
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void comboBox2_DrawItem(object sender, DrawItemEventArgs e)
 {
            Brush myBrush = Brushes.Black;

            e.DrawBackground();


            //根据项的索引设置字体颜色
            switch (e.Index)
            {
                case 0:
                    myBrush = Brushes.Gray;
                    break;
                case 1:
                    myBrush = Brushes.LawnGreen;
                    break;
                case 2:
                    myBrush = Brushes.Tan;
                    break;
            }

            //如果要设置大小则定义一个新的Font，用于替换e.Font
            e.Graphics.DrawString(this.comboBox2.Items[e.Index].ToString(), e.Font, myBrush, e.Bounds, StringFormat.GenericDefault);
            e.DrawFocusRectangle();
}

该代码从MSDN摘取，但经过简化和测试!