使用组合框绘制项目事件

Question

我正在使用ComboBox DrawItem事件，但是当我使用它时，所选项目无效。

我的意思是我按下右键单击组合框中的特定项目，但随机的其他项目显示在ComboBox中的选定行上（虽然选择的实际项目很好，但它只显示其他项目被选中）

这是我的代码：

System.Windows.Forms.ComboBox comboBox;
comboBox = new System.Windows.Forms.ComboBox();
comboBox.AllowDrop = true;
comboBox.DrawMode = DrawMode.OwnerDrawFixed;
comboBox.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
comboBox.FormattingEnabled = true;

comboBox.DrawItem += (sender, DrawItemEventArgs) =>
{
   Font font = comboBox.Font;
   Brush backgroundColor;
   Brush textColor;
   if (indexes.Contains(DrawItemEventArgs.Index))
   {
      if ((DrawItemEventArgs.State & DrawItemState.Selected)==DrawItemState.Selected)
      {
         backgroundColor = Brushes.Cyan;
         textColor = Brushes.Black;
      }
      else
      {
         backgroundColor = Brushes.Brown;
         textColor = Brushes.Black;
      }
   }
   else
   {
      if ((DrawItemEventArgs.State & DrawItemState.Selected)==DrawItemState.Selected)
      {
         backgroundColor = SystemBrushes.Highlight;
         textColor = SystemBrushes.HighlightText;
      }
      else
      {
         backgroundColor = SystemBrushes.Window;
         textColor = SystemBrushes.WindowText;
      }
   }
   DrawItemEventArgs.Graphics.FillRectangle(backgroundColor, DrawItemEventArgs.Bounds);
   if (DrawItemEventArgs.Index == -1)     return;

   DrawItemEventArgs.Graphics.DrawString((sender as ComboBox).
   Items[DrawItemEventArgs.Index].ToString(), font,textColor,DrawItemEventArgs.Bounds);
};

我的油漆有问题吗？因为我调试并发现这个事件正在制造麻烦。

TNX。