GridView排序Sorting事件

1、if (!IsPostBack)
            {
                DBindFilter();
                this.gvwData.Attributes.Add("SortExpression", "HouseID");
                this.gvwData.Attributes.Add("SortDirection", "ASC");
                GridViewDataBind();
                chklColumns.Visible = !IsPostBack;  //设置“显示字段”的下拉属性
            }
            else
            {
                chklColumns.Visible = IsPostBack;   //设置“显示字段”的下拉属性
            }

2、// 获取GridView排序数据列及排序方向
                string sortExpression = this.gvwData.Attributes["SortExpression"];
                string sortDirection = this.gvwData.Attributes["SortDirection"];
                if ((!string.IsNullOrEmpty(sortExpression)) && (!string.IsNullOrEmpty(sortDirection)))
                {
                    table.DefaultView.Sort = string.Format("{0} {1}", sortExpression, sortDirection);
                }
                gvwData.DataSource = table.DefaultView;
                gvwData.DataBind();

3、//排序
        protected void gvwData_Sorting(object sender, GridViewSortEventArgs e)
        {
            //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.gvwData.Attributes["SortExpression"])
            {
                //获得下一次的排序状态
                sortDirection = (this.gvwData.Attributes["SortDirection"].ToString() == sortDirection ? "DESC" : "ASC");
            }
            // 重新设定GridView排序数据列及排序方向
            this.gvwData.Attributes["SortExpression"] = sortExpression;
            this.gvwData.Attributes["SortDirection"] = sortDirection;

            this.GridViewDataBind();
        }