GridView排序记录,记录给自己

1.页面文件的设置就不说了.
2.数据绑定时

protected void BindGrid()
    {
        string sortexpression=GridView1.Attributes["SortExpression"];
        string sortdirection=GridView1.Attributes["SortDirection"];
        DataTable dt = employer.BindResumeList();
        if (!string.IsNullOrEmpty(sortdirection) && !string.IsNullOrEmpty(sortexpression))
        {
            dt.DefaultView.Sort = string.Format("{0} {1}",sortexpression,sortdirection);
        }
        this.GridView1.DataSource = dt.DefaultView;
        this.GridView1.DataBind();
    }

3.Sorting事件代码

    protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
    {
        string sortexpression = e.SortExpression.ToString();
        string sortdirection = "ASC";
        if (sortexpression == GridView1.Attributes["SortExpression"])
        { 
            sortdirection=(GridView1.Attributes["SortDirection"]==sortdirection?"DESC":"ASC");
        }
        GridView1.Attributes["SortExpression"] = sortexpression;
        GridView1.Attributes["SortDirection"] = sortdirection;
        BindGrid();
    }