Question

可能重复：
Colour Individual Items in a winforms ComboBox?

是设置每个项目的自定义背景颜色的任何简单示例吗？

Answer 1

您可以通过调用ComboBox的DrawItem来实现您的目标，有关参考，请参阅以下方法。

private void comboBox1_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e)
    {
        // Override this function to draw items in the Color comboBox

        // Get the Graphics Object (aka. CDC or Device Context Object )
        // passed via the DrawItemEventArgs parameter
        Graphics g = e.Graphics ;

        // Get the bounding rectangle of the item currently being painted
        Rectangle r = e.Bounds ;

        if ( e.Index >= 0 ) 
        {
            Rectangle rd = r; 
            r.X = r.Right ; 

            // Get the brush object, at the specifid index in the colorArray
            SolidBrush b = (SolidBrush)colorArray[e.Index];
            // Fill a portion of the rectangle with the selected brush
            g.FillRectangle(b, rd);


            // Draw the rectangle
            e.Graphics.DrawRectangle(new Pen(new SolidBrush(Color.Black), 2 ), r );

            if ( e.State == ( DrawItemState.NoAccelerator | DrawItemState.NoFocusRect))
            {
                // if the item is not selected draw it with a different color
                e.Graphics.FillRectangle(new SolidBrush(Color.White) , r);
                e.DrawFocusRectangle();
            }
            else
            {
                // if the item is selected draw it with a different color
                e.Graphics.FillRectangle(new SolidBrush(Color.LightBlue) , r);
                e.DrawFocusRectangle();
            }
        }
    }

C＃组合框颜色

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