如何修改 WebControls.GridView 中的字段列？

Question

概述： 使用 C#，我将 LINQ to SQL 数据表输出到 WebControls.GridView，然后将其输出到从网页提供的 Excel 文件。如何修改 GridView 中的字段？

问题：Excel 正在截断和/或将数字字符串转换为科学记数法。

198886545467896 变成 1.98887E+14

为了将该字段保留为字符串，我需要将该字段包装为字符串公式，如下所示，以便 Excel 能够按预期显示它。

="198886545467896"

问题：如何使用 ="[number]" 将字段数据包装在特定的 GridView 列中？

这是我的相关 C#：

public void DownloadExcelReport(int id)
    {
        // See: http://www.codeshelve.com/code/details/54/export-to-excel-in-asp-net-mvc
        // Or: http://www.billsternberger.net/asp-net-mvc/export-to-excel-or-csv-from-asp-net-mvc-with-c/
        // Or: http://blog.wiredworx.co.uk/website-and-seo/c-tutorials-and-tips-visual-studio/exporting-to-an-excel-file-from-asp-net-mvc/
        // same solution - discussed differently            

        IEnumerable<Customer> customers = Db.Customers(id);

        // Create a grid and bind the customer data to it.
        var grid = new System.Web.UI.WebControls.GridView();
        grid.DataSource = customers;
        grid.DataBind();

        // TODO: I need to wrap the data in column 2 with =" "
        // UPDATE: INSERT the code from the accepted answer below right here

        // Prep the http response to return an excel mime type file
        Response.ClearContent();
        Response.AddHeader("content-disposition", "attachment; filename=Report.xls");
        Response.ContentType = "application/excel";

        // Output the grid via the html writer to the response
        StringWriter sw = new StringWriter();
        var htw = new System.Web.UI.HtmlTextWriter(sw);
        grid.RenderControl(htw);
        Response.Write(sw.ToString());
        Response.End();
    }

更新：回想起来，这本来可以写得更简单，以隔离特定问题：GridView 导航起来很笨拙。不过，很高兴拥有有关如何从 Linq to Sql 表一直输出到 Excel 文件以供以后参考的完整解决方案。

Answer 1

另请参阅 http://www.highoncoding.com/Articles/197_Extective_Study_of_GridView_Export_to_Excel.aspx

Answer 2

像这样的东西吗？

System.Web.UI.WebControls.GridView() test = new System.Web.UI.WebControls.GridView();
for (int i = 0; i < grid.Rows.Count; i++)
{
    test.Rows[i].Cells[<yer column index>].Text = "=/"" + test.Rows[i].Cells[<yer column index>].Text + "/"";
}