Question

我在ASP.Net网页（.Net 4.0，C＃）中有一个GridView，它有一些不可见的列。但是，用户希望这些列显示在Excel导出中。我很难过如何做到这一点。我已经尝试将其中一列添加到BoundField和TemplateField中，其中包含一个标签：

<asp:TemplateField HeaderText="Device Comments" SortExpression="DeviceComments" Visible="false">
                <ItemTemplate>
                    <asp:Label runat="server" Text='<%# Eval("DeviceComments") %>' ID="lbDeviceComments" />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="DeviceComments" HeaderText="Device Comments" SortExpression="DeviceComments" Visible="false" />

按预期方式，列不会显示在网页上。但是，当我尝试在导出到Excel的方法中显示列时，它们仍然不可见。我试过了：

protected void Export2Excel(object sender, EventArgs e)
        {
            Response.ClearContent();
            Response.AppendHeader("content-disposition", "attachment; filename=Mobile.xls");
            Response.ContentType = "application/excel";

            StringWriter stringWriter = new StringWriter();
            HtmlTextWriter htmlTextWriter = new HtmlTextWriter(stringWriter);

            GridView currentGridView = new GridView();
            switch (DeviceType())
            {
                case "cell":
                    currentGridView = gvCellResults;
                    break;
                case "loaner":
                    currentGridView = gvCellResults;
                    break;
                case "wireless":
                    currentGridView = gvCellResults;
                    break;
                case "smartphone":
                    currentGridView = gvSmartPhoneResults;
                    break;
            }

            foreach (GridViewRow gridViewRow in currentGridView.Rows)
            {
                gridViewRow.ForeColor = Color.Black;
                HyperLink phonenumber = new HyperLink();
                HyperLink imei = new HyperLink();
                HyperLink employee = new HyperLink();
                foreach (TableCell gridViewRowTableCell in gridViewRow.Cells)
                {
                    phonenumber = (HyperLink)gridViewRowTableCell.FindControl("hrefPhoneNumber");
                    imei = (HyperLink)gridViewRow.Cells[1].FindControl("hrefIMEI");
                    employee = (HyperLink)gridViewRow.Cells[6].FindControl("hrefEmpName");
                    gridViewRowTableCell.Style["forecolor"] = "#000000";
                }
                gridViewRow.Cells[11].Visible = true;
                gridViewRow.Cells[11].Style["display"] = "inline";
                if (gridViewRow.RowType == DataControlRowType.DataRow)
                {
                    for (int columnIndex = 0; columnIndex < gridViewRow.Cells.Count; columnIndex++)
                    {
                        gridViewRow.Cells[columnIndex].Attributes.Add("class", "text");
                        gridViewRow.Cells[columnIndex].Text = gridViewRow.Cells[columnIndex].Text.StripTags();
                    }

                    if (phonenumber != null)
                        gridViewRow.Cells[0].Text = phonenumber.Text;
                    if (imei != null)
                        gridViewRow.Cells[1].Text = imei.Text;
                    if (employee != null)
                        gridViewRow.Cells[6].Text = employee.Text;
                }
            }

            currentGridView.RenderControl(htmlTextWriter);
            string style = @"<style> .text { mso-number-format:\@; } </style> ";
            Response.Write(style);
            Response.Write(stringWriter.ToString());
            Response.End();
        }

但该列未出现在Excel中。我确定我正在寻找正确的列，因为我已经通过调试器运行它并检查了单元格的Text属性;它们与该列的网页上显示的内容相匹配。奇怪的是，在调试器中，单元格的Visible属性在我将其更改为true之前显示为true。我做错了什么？

Answer 1

在我的情况下调用os.path.basename(path)之前尝试使列可见。

像

这样的东西

Response.ClearContent();

Answer 2

我确定您正在加载要在页面加载时显示在GridView上的数据或按钮单击事件。我建议将这些数据保存在缓存或内存中，然后使用像EPPlus这样的库生成具有所需格式的Excel文件。 Here是一篇展示如何使用EPPlus的文章。

Here是关于SO的另一个问题，它讨论了使用ashx处理程序来创建一个有用的Excel文件。

将GridView中的不可见列导出到Excel

2 个答案: