Gridview排序

前台代码：

<asp:GridView ID="GV" runat="server" CssClass="tabelStyle"
            AutoGenerateColumns="False" Width="100%" AllowPaging="True" PageSize="20"  AllowSorting="true"
            onpageindexchanging="GV_PageIndexChanging" onsorting="GV_Sorting" >

后台代码：

protected void GV_Sorting(object sender, GridViewSortEventArgs e)
        {
            // 从事件参数获取排序数据列
            string sortExpression = e.SortExpression.ToString();

            // 假定为排序方向为“顺序”
            string sortDirection = "ASC";

            // “ASC”与事件参数获取到的排序方向进行比较，进行GridView排序方向参数的修改
            if (sortExpression == this.GV.Attributes["SortExpression"])
            {
                //获得下一次的排序状态
                sortDirection = (this.GV.Attributes["SortDirection"].ToString() == sortDirection ? "DESC" : "ASC");
            }

            // 重新设定GridView排序数据列及排序方向
            this.GV.Attributes["SortExpression"] = sortExpression;
            this.GV.Attributes["SortDirection"] = sortDirection;

            bindGv();
        }