手动栅格视图排序

本文关键字:视图 排序 | 更新日期: 2023-09-27 17:49:19

我的网格视图是手动数据绑定的(用于其他工作(。阅读其他线程时,我必须管理自己的排序事件。

当点击一个列在我的网页上排序时,我会得到错误:

"对象引用未设置为对象的实例。">

这样做的结果是表为null,但我不明白为什么它为null。

有什么想法吗?

protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
    DataTable table = GetData();
    table.DefaultView.Sort = e.SortExpression + " " + SetSortDirection(e.SortDirection.ToString());
    GridView1.DataSource = table;
    GridView1.DataBind();
}

protected string SetSortDirection(string currentsortDirection)
{
    string sortDirection;
    if (currentsortDirection == "Ascending")
    {
        sortDirection = "Descending";
    }
    else
    {
        sortDirection = "Ascending";
    }
    return sortDirection;
}

编辑:

public DataTable GetData()
{
    SqlConnection conn = new SqlConnection(@"Data Source=.'SQLEXPRESS;Initial Catalog=DatabaseName;Integrated Security=True");
    conn.Open();
    string query = "SELECT * FROM tablex WHERE Property='" + Request.QueryString["xxx"] + "'";
    SqlCommand cmd = new SqlCommand(query, conn);
    DataTable dt = new DataTable();
    dt.Load(cmd.ExecuteReader());
    return dt;
}

谢谢。

手动栅格视图排序

 DataTable table = BuildInfo_GridView.DataSource as DataTable;

像这样,你不会得到数据源,你已经绑定了回调查询来获得数据表,或者当你绑定数据时,只将其存储在视图状态并获得

Save your sort order in view state
if (ViewState["sortOrder"] != null)
            {
                ViewState["sortExpression"] = e.SortExpression;
                if (ViewState["sortOrder"].ToString().ToUpper() == "ASCENDING")
                {
                    e.SortDirection = SortDirection.Descending;
                    ViewState["sortOrder"] = SortDirection.Descending.ToString();
                }
                else
                {
                    e.SortDirection = SortDirection.Ascending;
                    ViewState["sortOrder"] = SortDirection.Ascending.ToString();
                }
            }
            else
            {
                ViewState["sortExpression"] = e.SortExpression;
                ViewState["sortOrder"] = e.SortDirection.ToString();
            }