Question

所以我设法将我的管理区域导出，以便用户下载到xml文件格式。但是我已经设置了一些过滤选项，因此登录的用户可以缩小可查看的结果范围。我试图实现的是在用户应用这些过滤器之后才能导出过滤后的数据。

以下代码：

protected void ExportData_Click(object sender, EventArgs e)
    {
        string consString = ConfigurationManager.ConnectionStrings["TortoiseDBConnectionString"].ConnectionString;
        StringBuilder sb = new StringBuilder();
        using (SqlConnection con = new SqlConnection(consString))
        {
            con.Open();
            string sql = ("SELECT [ID], [HouseNumber], [PropAddress], [Town], [County], [PostCode] FROM Zoopla;");
            SqlCommand cmd = new SqlCommand(sql, con);
            DataTable dt = new DataTable();
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(dt);
            GridView1.DataBind();
            cmd.Dispose();
            con.Close();


            string filename = "DownloadTest.xml";
            System.IO.StringWriter tw = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
            DataGrid dgGrid = new DataGrid();
            dgGrid.DataSource = dt;
            dgGrid.DataBind();

            dgGrid.RenderControl(hw);

            Response.ContentType = "application/vnd.ms-excel";
            Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");
            this.EnableViewState = false;
            Response.Write(tw.ToString());
            Response.End();
        }
    }

过滤器设置如下：

 Filter By Weeks:
    <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" DataSourceID="TortoiseDBZoopla" DataTextField="Weeks" DataValueField="Weeks">

    </asp:DropDownList>
    Filter By Status:
    <asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True" DataSourceID="ZooplaProperties" DataTextField="PropStatus" DataValueField="PropStatus">

    </asp:DropDownList>

Answer 1

您的gridview已经过滤，但是在导出时，您正在运行没有过滤器的新SQL查询。您需要在查询中添加where子句以过滤结果，或者以某种方式保留gridview数据源（Viewstate，Session，Cache ...）并将其用作导出数据源。

仅从gridview asp.net导出过滤后的数据

1 个答案: