如何在ASP.NET中生成Excel 2007文件而不會收到警告消息？

每當我打開我我的ASP.NET頁面上生成與Excel 2007中xls文件，我得到以下錯誤：如何在ASP.NET中生成Excel 2007文件而不會收到警告消息？

The file you are trying to open, 'filename.xls', is in a different format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening the file. Do you want to open the file now?

如果我點擊「是」，一切都看起來不錯，但它很煩人我們的客戶每次都必須點擊。如果他們使用2003年，沒有問題，但在2007年，它給出了這個錯誤。這裏是我使用的代碼：

string style = @"<style> .text { mso-number-format: \@ } </style> "; 

Response.Clear(); 
Response.AddHeader("content-disposition", string.Format("attachment;filename=OperationsReport_Rejects_{0}.xls", DateTime.Today.ToString("yyyyMMdd"))); 
Response.Charset = ""; 
Response.ContentType = "application/vnd.xls"; 

StringWriter stringWrite = new StringWriter(); 
HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite); 

reportOperationsRejectsGridView.RenderControl(htmlWrite); 
Response.Write(style); 
Response.Write(stringWrite.ToString()); 
Response.End();

有誰知道是什麼原因造成它在2003和2007的行爲不同？

來源

2009-11-20 Jeffrey Lott