GridView AllowSorting Example

//后台代码：

 protected void CustomersGridView_RowCreated(Object sender, GridViewRowEventArgs e)    {        if (e.Row.RowType == DataControlRowType.Header)        {            int sortColumnIndex = GetSortColumnIndex();

            if (sortColumnIndex != -1)            {                AddSortImage(sortColumnIndex, e.Row);            }        }    }

    int GetSortColumnIndex()    {

        foreach (DataControlField field in CustomersGridView.Columns)        {            if (field.SortExpression == CustomersGridView.SortExpression)            {                return CustomersGridView.Columns.IndexOf(field);            }        }

        return -1;    }

    void AddSortImage(int columnIndex, GridViewRow headerRow)    {        Image sortImage = new Image();        if (CustomersGridView.SortDirection == SortDirection.Ascending)        {            sortImage.ImageUrl = "~/Images/03.jpg";            sortImage.AlternateText = "Ascending Order";        }        else        {            sortImage.ImageUrl = "~/Images/05.jpg";            sortImage.AlternateText = "Descending Order";        }

        headerRow.Cells[columnIndex].Controls.Add(sortImage);

    }

//前台：

 

 <form id="Form1" runat="server">             <h3>GridView AllowSorting Example</h3>

      <asp:gridview id="CustomersGridView"        datasourceid="CustomersSource"        autogeneratecolumns="False"        emptydatatext="No data available."        allowsorting="True"        onrowcreated="CustomersGridView_RowCreated"        runat="server">          <Columns>              <asp:BoundField DataField="GoodsID" HeaderText="商品ID" ReadOnly="True" SortExpression="GoodsID" />              <asp:BoundField DataField="GoodsName" HeaderText="商品名称" SortExpression="GoodsName" />              <asp:BoundField DataField="SellPrice" HeaderText="销售价格" SortExpression="SellPrice" />          </Columns>          <PagerTemplate>              <asp:Image ID="Image1" runat="server" />          </PagerTemplate>                     </asp:gridview>                 <!-- This example uses Microsoft SQL Server and connects  -->      <!-- to the Northwind sample database. Use an ASP.NET     -->      <!-- expression_r to retrieve the connection string value   -->      <!-- from the Web.config file.                            -->      <asp:sqldatasource id="CustomersSource"        selectcommand="SELECT [GoodsID], [GoodsName], [SellPrice] FROM [tb_Goods]"        connectionstring="<%$ ConnectionStrings:db_GoodsManageConnectionString %>"        runat="server"/>           </form>