从 ASP.NET 打开导出的 Excel 工作表时格式或扩展名无效

Question

我正在尝试按照以下解决方案使用Response 将我的 ASP.NET 应用程序中的 HTML 导出到 excel 文件中：
Export HTML Table to Excel using ASP.NET.

这正是我点击导出按钮时导出HTML表格的功能：

protected void exportBtn_Click(object sender, EventArgs e)
        {

            string filename = "Results_" + DateTime.Now.ToString("ddMMyyyy")+".xlsx";
            Response.Clear();
            Response.ContentType = "application/x-msexcel";
            Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}", filename));
            Response.ContentEncoding = Encoding.UTF8;
            StringWriter stringWriter = new StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(stringWriter);
            resultTable.RenderControl(hw);
            Response.Write(stringWriter.ToString());
            Response.End();

        }

导出完成后，当我尝试打开生成的 .xlsx 文件时，它会显示以下消息：

知道如何解决这个问题吗？

Answer 1

简单的解决方案是将ContentType从"application/x-msexcel"更改为"application/vnd.ms-excel"，并使用.xls作为扩展名，而不是使用.xlsx。

最终代码为：

protected void exportBtn_Click(object sender, EventArgs e)
        {

            string filename = "Results_" + DateTime.Now.ToString("ddMMyyyy")+".xls";
            Response.Clear();
            Response.ContentType = "application/vnd.ms-excel";
            Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}", filename));
            Response.ContentEncoding = Encoding.UTF8;
            StringWriter stringWriter = new StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(stringWriter);
            resultTable.RenderControl(hw);
            Response.Write(stringWriter.ToString());
            Response.End();

        }