Winform ComboBox控件高亮显示

 

 
            //重绘下拉表单窗口，需要在窗口设计代码中加入下面这一句  
            this.cmdChannelName.DrawMode = System.Windows.Forms.DrawMode.OwnerDrawFixed;
            //下拉表单重绘事件  
            this.cmdChannelName.DrawItem += new System.Windows.Forms.DrawItemEventHandler(kineticFileComboBox_DrawItem);
            this.cmdChannelName.DropDownClosed += new System.EventHandler(kineticFileComboBox_DropDownClosed);




  #region ComboBox控件高亮显示
        //[主程序中的代码]  
        private void kineticFileComboBox_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e)
        {
            // 绘制背景  
            e.DrawBackground();
            //绘制列表项目  
            e.Graphics.DrawString(cmdChannelName.Items[e.Index].ToString(), e.Font, System.Drawing.Brushes.Black, e.Bounds);
            //将高亮的列表项目的文字传递到toolTip1(之前建立ToolTip的一个实例)  
            if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
                toolTip1.Show(cmdChannelName.Items[e.Index].ToString(), cmdChannelName, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
            e.DrawFocusRectangle();
        }

        //关闭列表时，同时关闭toolTip1的显示  
        private void kineticFileComboBox_DropDownClosed(object sender, System.EventArgs e)
        { toolTip1.Hide(cmdChannelName); }
        #endregion

 

效果图：