Question

在我的gridview中我有30000条记录，当我导出到excel时，它只导出近12000条记录，而不是我的代码导出到excel。

GridView1.AllowPaging = false;
DataTable dt = (DataTable)Session["tabledata"];
GridView1.DataSource = dt;
GridView1.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "Customers.xls"));
Response.ContentType = "application/ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);

//Change the Header Row back to white color
GridView1.HeaderRow.Style.Add("background-color", "Red");
//Applying stlye to gridview header cells
for (int i = 0; i < GridView1.HeaderRow.Cells.Count; i++)
{
    GridView1.HeaderRow.Cells[i].Style.Add("background-color", "Red");
}
GridView1.RenderControl(htw);
Response.Write(sw.ToString());
Response.End();

这里如何将所有（30k）gridview记录导出为excel？

Answer 1

以下是将网格数据保存到Excel文件的示例代码

  protected void ExportToExcel(object sender, EventArgs e)
    {
        Response.Clear();
        Response.Buffer = true;
        Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.xls");
        Response.Charset = "";
        Response.ContentType = "application/vnd.ms-excel";
        using (StringWriter sw = new StringWriter())
        {
            HtmlTextWriter hw = new HtmlTextWriter(sw);

            //To Export all pages
            GridView1.AllowPaging = false;
            this.BindGrid();

            GridView1.HeaderRow.BackColor = Color.White;
            foreach (TableCell cell in GridView1.HeaderRow.Cells)
            {
                cell.BackColor = GridView1.HeaderStyle.BackColor;
            }
            foreach (GridViewRow row in GridView1.Rows)
            {
                row.BackColor = Color.White;
                foreach (TableCell cell in row.Cells)
                {
                    if (row.RowIndex % 2 == 0)
                    {
                        cell.BackColor = GridView1.AlternatingRowStyle.BackColor;
                    }
                    else
                    {
                        cell.BackColor = GridView1.RowStyle.BackColor;
                    }
                    cell.CssClass = "textmode";
                }
            }

            GridView1.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();
        }
    }

Answer 2

我建议您查看OpenXmlWriter类，以便将大量数据导出到excel（这应该可以防止缓存问题）。

Answer 3

要将数据导出到Excel，您可以使用ClosedXML.Report库（https://github.com/ClosedXML/ClosedXML.Report）。相信我，这是一个很棒的图书馆，很容易让她使用。该库不需要Excel Interop。 ClosedXML.Report基于您可以使用任何格式在Excel中创建的模板生成Excel文件。例如：

scanf_s("%d", &zahlen[i]);

将大数据导出到Excel

3 个答案: