GridView自动排序

GridView的功能很强大，可以实现很多的功能，下面我讲下GridView自动排序的实现方法。

 /**//// <summary>
    /// GridView排序
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
    {


        if (GridViewSortExpression.Equals(e.SortExpression))
        {
            GridViewSortExpression = e.SortExpression;
            if (GridViewSortDirection.Equals("ASC"))
            {
                GridViewSortDirection = "DESC";
                this.GridView1.DataSource = SortDataTable(数据源, false);
            }
            else if (GridViewSortDirection.Equals("DESC"))
            {
                GridViewSortDirection = "ASC";
                this.GridView1.DataSource = SortDataTable(数据源, true);
            }
            else
            {
                GridViewSortDirection = "ASC";
                this.GridView1.DataSource = SortDataTable(数据源, true);
            }
        }
        else
        {
            GridViewSortDirection = "ASC";
            GridViewSortExpression = e.SortExpression;
            this.GridView1.DataSource = SortDataTable(数据源, true);
        }
        this.GridView1.DataBind();

    }
    /**//// <summary>
    /// 排序，并保存排序结果
    /// </summary>
    /// <param name="dataTable"></param>
    /// <param name="isPageIndexChanging"></param>
    /// <returns></returns>
    protected DataView SortDataTable(DataTable dataTable, bool isPageIndexChanging)
    {

        if (dataTable != null)
        {

            DataView dataView = new DataView(dataTable);

            if (GridViewSortExpression != string.Empty)
            {

                if (isPageIndexChanging)
                {

                    dataView.Sort = string.Format("{0} {1}", GridViewSortExpression, "ASC");

                }

                else
                {

                    dataView.Sort = string.Format("{0} {1}", GridViewSortExpression, "DESC");

                }
                //if (Session["FileListTable"] != null)  
                //    Session["FileListTable"] = GetDataTable(dataView);        

            }

            return dataView;

        }

        else
        {

            return new DataView();

        }

    }