下载的Excel文件无法打开

Question

I am trying to download excel file to the location in local system but on opening the file, i am getting error:

The file format or extension does not match.

Although the file at backend is of same extension but i am getting the error PFB the code:

string ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.ContentType = ContentType;
Response.AppendHeader("Content-Disposition", "attachment; filename="+downloadedFileName);


downloadedFileName= "Myfile.xlsx"

Answer 1

It will save as details.xls

Response.ClearContent();
 Response.Buffer = true;
   Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "Details.xls"));
    Response.ContentType = "application/ms-excel";

Answer 2

You have this error because you're not using Response.TransmitFile() . Your code should be:

string ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.ContentType = ContentType;
Response.AppendHeader("Content-Disposition", "attachment; filename="+downloadedFileName);
Response.TransmitFile(FilePath); // full path here