Question

我在asp.net中将数据从Gridview导出到Excel时出错了

Firebug显示错误

“错误：Sys.WebForms.PageRequestManagerParserErrorException：无法解析从服务器收到的消息。此错误的常见原因是通过调用Response.Write（），响应过滤器，HttpModules或服务器修改响应时跟踪已启用。详细信息：解析附近时出错

我的代码是

EditUser _editUser = new EditUser();
        string s = Request.QueryString["UserName"];
        DataTable _dsLeaveDetails1 = new DataTable();
        _dsLeaveDetails1 = _editUser.GetUserWiseECO(s.ToLower(), "Earned Comp Off");
        if (_dsLeaveDetails1.Rows.Count > 0)
        {
            Response.ClearContent();
            Response.Buffer = true;
            Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "MonthlyLeaveReport.xls"));
            Response.ContentType = "application/ms-excel";
            StringWriter sw = new StringWriter();
            HtmlTextWriter htw = new HtmlTextWriter(sw);

            sample.AllowPaging = false;

            sample.DataSource = _dsLeaveDetails1;
            sample.DataBind();

            //Change the Header Row back to white color
            sample.HeaderRow.Style.Add("background-color", "#FFFFFF");
            //Applying stlye to gridview header cells
            for (int i = 0; i < sample.HeaderRow.Cells.Count; i++)
            {
                sample.HeaderRow.Cells[i].Style.Add("background-color", "#507CD1");
            }
            int j = 1;
            //This loop is used to apply stlye to cells based on particular row
            foreach (GridViewRow gvrow in sample.Rows)
            {
                gvrow.BackColor = Color.White;
                if (j <= sample.Rows.Count)
                {
                    if (j % 2 != 0)
                    {
                        for (int k = 0; k < gvrow.Cells.Count; k++)
                        {
                            gvrow.Cells[k].Style.Add("background-color", "#EFF3FB");
                        }
                    }
                }
                j++;
            }
            sample.RenderControl(htw);
            Response.Write(sw.ToString());
            Response.End();
        }
        else
        {
            ScriptManager.RegisterStartupScript(this, GetType(), "displayalertmessage", "alert('No records Found!!!');", true);
        }

Answer 1

这是我正在使用的完整代码。

首先覆盖此方法：

public override void VerifyRenderingInServerForm(Control control)
{
}

并使用此方法导出到Excel：

private void ExportToExcel()
{
    Response.Clear();
    Response.Buffer = true;
    Response.AddHeader("content-disposition", "attachment;filename=name.xls");
    Response.Charset = "utf-8";
    Response.ContentType = "application/vnd.ms-excel";
    using (StringWriter sw = new StringWriter())
    {
        HtmlTextWriter hw = new HtmlTextWriter(sw);

        //To Export all pages
        gridview.AllowPaging = false;

        gridview.HeaderRow.BackColor = Color.White;
        foreach (TableCell cell in gridview.HeaderRow.Cells)
        {
            cell.BackColor = Color.FromName("#4091A4");
            cell.ForeColor = Color.White;

            foreach (Control control in cell.Controls)
            {
                if ((control.GetType().Name == "DataControlLinkButton") ||
                     (control.GetType().Name == "DataControlLinkButton"))
                {
                    cell.Controls.Add(new Literal { Text = (control as LinkButton).Text });
                    cell.Controls.Remove(control);
                }
            }
        }
        foreach (GridViewRow row in gridview.Rows)
        {
            row.BackColor = Color.White;
            foreach (TableCell cell in row.Cells)
            {
                List<Control> controls = new List<Control>();

                foreach (Control control in cell.Controls)
                {
                    controls.Add(control);
                }

                cell.CssClass = "textmode";
                foreach (Control control in controls)
                {
                    switch (control.GetType().Name)
                    {
                        case "HyperLink":
                            cell.Controls.Add(new Literal { Text = (control as HyperLink).Text });
                            break;
                        case "TextBox":
                            cell.Controls.Add(new Literal { Text = (control as TextBox).Text });
                            break;
                        case "DataControlLinkButton":
                        case "LinkButton":
                            cell.Controls.Add(new Literal { Text = (control as LinkButton).Text });
                            break;
                        case "CheckBox":
                            cell.Controls.Add(new Literal { Text = (control as CheckBox).Text });
                            break;
                        case "RadioButton":
                            cell.Controls.Add(new Literal { Text = (control as RadioButton).Text });
                            break;
                    }
                    cell.Controls.Remove(control);
                }

                if (row.RowIndex % 2 == 0)
                {
                    cell.BackColor = gridview.AlternatingRowStyle.BackColor;
                }
                else
                {
                    cell.BackColor = gridview.RowStyle.BackColor;
                }
                cell.HorizontalAlign = HorizontalAlign.Center;
            }
        }

        gridview.RenderControl(hw);

        //style to format numbers to string
        string style = @"<style> .textmode { } </style>";
        Response.Write(style);
        Response.Output.Write(sw.ToString());
        Response.Flush();
        Response.End();
    }
}

将数据从Gridview导出到asp.net中的Excel

1 个答案: