Question

我想将父网格视图和嵌套网格视图导出为excel。

我有一个代码只能导出普通的简单gridview。试图调试代码，发现没有错误或任何错误。

就在我点击导出按钮后，它不会导出到Excel。

这是我的代码

 protected void asd()
{

    string title = "";
    string attempt = "SELECT * FROM Poll Where PollID = '" + Session["abc"] + "'";

    cmd = new SqlCommand(attempt, con);
    dr = cmd.ExecuteReader();
    while (dr.Read())
    {
        title = dr["PollTitle"].ToString();
    }

    string filename = String.Format(title + " RESULTS. " + "{0}_{1}.xls",
 DateTime.Today.Month.ToString(), DateTime.Today.Year.ToString());

    Response.Clear();
    Response.AddHeader("Content-Disposition", "attachment;filename=" + filename);
    Response.Charset = "";

    // SetCacheability doesn't seem to make a difference (see update)
    Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);

    Response.ContentType = "application/vnd.xls";

    System.IO.StringWriter stringWriter = new System.IO.StringWriter();
    System.Web.UI.HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);

    // Replace all gridview controls with literals
    ClearControls(GridView3);

    // Throws exception: Control 'ComputerGrid' of type 'GridView'
    // must be placed inside a form tag with runat=server.
    // ComputerGrid.RenderControl(htmlWrite);

    // Alternate to ComputerGrid.RenderControl above
    System.Web.UI.HtmlControls.HtmlForm form
        = new System.Web.UI.HtmlControls.HtmlForm();
    Controls.Add(form);
    form.Controls.Add(GridView3);
    form.RenderControl(htmlWriter);

    Response.Write(stringWriter.ToString());
    Response.End();
}

private void ClearControls(Control control)
{
    for (int i = control.Controls.Count - 1; i >= 0; i--)
    {
        ClearControls(control.Controls[i]);
    }

    if (!(control is TableCell))
    {
        if (control.GetType().GetProperty("SelectedItem") != null)
        {
            LiteralControl literal = new LiteralControl();
            control.Parent.Controls.Add(literal);
            try
            {
                literal.Text =
                    (string)control.GetType().GetProperty("SelectedItem").
                        GetValue(control, null);
            }
            catch
            { }
            control.Parent.Controls.Remove(control);
        }
        else if (control.GetType().GetProperty("Text") != null)
        {
            LiteralControl literal = new LiteralControl();
            control.Parent.Controls.Add(literal);
            literal.Text =
                (string)control.GetType().GetProperty("Text").
                    GetValue(control, null);
            control.Parent.Controls.Remove(control);
        }
    }
    return;

}
protected void Export_buttonClick(object sender, EventArgs e)
{
    asd();
}

此代码适用于普通网格视图，但不适用于嵌套网格视图。

Answer 1

过去我经历过'必须放在带有runat = server'的表单标记内并通过在我的页面代码隐藏中添加以下覆盖方法来解决问题：

public override void VerifyRenderingInServerForm(Control control) {}

More info on MSDN

作为参考，我还使用此代码导出GridViews：

Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment;filename=your_file.xls");
Response.Charset = "";
Response.ContentEncoding = System.Text.Encoding.Default;
Response.ContentType = "application/ms-excel";

StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
your_GridView.RenderControl(hw);

Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();

嵌套gridview导出到excel，asp.net c＃

1 个答案: