DataGrid的双向排序

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protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
                      if (this.dgAllOrderList.Attributes["SortExpression"] == null)
                    {

///排序的字段
dgAllOrderList.Attributes["SortExpression"] = "MealPlan_DateTime";

                        ///正向还是反向排序
                        dgAllOrderList.Attributes["SortDirection"] = "desc";
                    }

                    this.Grid();
         }
    }

private void Grid()
{

         ///获得数据的绑定
        DataTable dt = OrderMeal.GetAllMealList();
        DataView dv = new DataView();
        dv = dt.DefaultView;
        dv.Sort = dgAllOrderList.Attributes["SortExpression"] + " " + dgAllOrderList.Attributes["SortDirection"];
        this.dgAllOrderList.DataSource = dv;
        this.dgAllOrderList.DataBind();
    }

protected void dgAllOrderList_SortCommand(object source, DataGridSortCommandEventArgs e)
    {
        string SortExpression = e.SortExpression.ToString();
        string SortDirection = "desc";
        if (SortExpression == dgAllOrderList.Attributes["SortExpression"])
        {
            SortDirection = (dgAllOrderList.Attributes["SortDirection"].ToString() == SortDirection ? "asc" : "desc");
        }
        this.dgAllOrderList.Attributes["SortExpression"] = SortExpression;
        this.dgAllOrderList.Attributes["SortDirection"] = SortDirection;

this.Grid();
}