ComboBox ItemHeight 再高一点

         public static void BindData(this ComboBox box, List<KeyValuePair<long, string>> data)
         {
             box.ItemHeight = ;
             box.DropDownStyle = ComboBoxStyle.DropDownList;
             box.DrawMode = DrawMode.OwnerDrawFixed;
             box.DataSource = data;
             box.DrawItem += (sender, e) =>
             {
                 if (e.Index < )
                 {
                     return;
                 }
                 e.DrawBackground();
                 e.DrawFocusRectangle();
                 e.Graphics.DrawString(data[e.Index].Value.ToString(), e.Font, new SolidBrush(e.ForeColor), e.Bounds.X, e.Bounds.Y + );
             };
         }