对于c# MVC 4.5，你需要这样做:

Response.Clear();
Response.ContentType = "application/CSV";
Response.AddHeader("content-disposition", "attachment; filename=\"" + fileName + ".csv\"");
Response.Write(dataNeedToPrint);
Response.End();
return new EmptyResult();  //this line is important else it will not work.

使用text/csv作为内容类型。

根据RFC 4180, CSV的MIME类型为text/ CSV。

我发现IE的问题是，它嗅探返回数据，并对它认为已经发送的内容类型做出自己的判断。这导致了许多副作用，例如总是打开文本文件的saveAs对话框，因为您正在使用数据传输的压缩。解决方案是(在php代码中)......

header('X-Content-Type-Options: nosniff');

对于c# MVC 4.5，你需要这样做:

Response.Clear();
Response.ContentType = "application/CSV";
Response.AddHeader("content-disposition", "attachment; filename=\"" + fileName + ".csv\"");
Response.Write(dataNeedToPrint);
Response.End();
return new EmptyResult();  //this line is important else it will not work.

就像这样使用

Response.Clear();
Response.ContentType = "application/CSV";
Response.AddHeader("content-disposition", "attachment; filename=\"" + filename + ".csv\"");
Response.Write(t.ToString());
Response.End();