C# 如何给CSS属性gridview排序点击事件？

我填写了我的表格。同时给出属性排序。但我需要进行上下图像排序。单击降序cssclass=“sortdescheder”。但我不能这样做。我怎么做呢？İ真正用于以下代码。请帮我输入以下代码

protected void gvProducts_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        GridView gridView = (GridView)sender;

        if (gridView.SortExpression.Length > 0)
        {
            int cellIndex = -1;
            foreach (DataControlField field in gridView.Columns)
            {
                if (field.SortExpression == gridView.SortExpression)
                {
                    cellIndex = gridView.Columns.IndexOf(field);
                    break;
                }
            }

            if (cellIndex > -1)
            {
                if (e.Row.RowType == DataControlRowType.Header)
                {
                  e.Row.Cells[cellIndex].CssClass += (gridView.SortDirection == SortDirection.Ascending
                                                      ? " sortascheader" : " sortdescheader");
                }
                else if (e.Row.RowType == DataControlRowType.DataRow)
                {
                     e.Row.Cells[cellIndex].CssClass +=  (e.Row.RowIndex % 2 == 0  ? " sortaltrow" : "sortrow");
                }
            }
        }
    }

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可以扩展gridview以允许插入排序箭头。这样，您就可以在多个位置使用它，而无需复制代码：reference:

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很抱歉，我在进行更改时没有在ide中加载此内容。尝试将其设置为空白字符串或普通CSS类

public class GridView : System.Web.UI.WebControls.GridView
{
   protected override void OnSorted(EventArgs e)
   {
      string AscCSS = ...;
      string DescCSS= ...;

      foreach (DataControlField field in this.Columns)
      {
         // strip off the old ascending/descending icon
        field.HeaderStyle.CssClass.Remove();

         // See where to add the sort ascending/descending icon
         if (field.SortExpression == this.SortExpression)
         {
            if (this.SortDirection == SortDirection.Ascending)
               field.HeaderStyle.CssClass = AscCSS;
            else
               field.HeaderStyle.CssClass = DescCss;
         }
      }

      base.OnSorted(e);
   }
}