生成文件并直接输出下载

string  fileName  =   "" ;

fileName  =  DateTime.Now.ToFileTime()  +   " .csv " ;

MemoryStream memory  =   new  MemoryStream();
StreamWriter writer  =   new  StreamWriter(memory, System.Text.Encoding.GetEncoding( " GB2312 " ));

string  title  =   " 内容 " ;
writer.WriteLine(title);

writer.Flush();
          
Response.Clear();
Response.ClearHeaders();
Response.Buffer  =   true ;
Response.ContentType  =   " application/csv " ;
Response.AddHeader( " Content-Disposition " ,  " attachment;filename= "   +  fileName);
Response.BinaryWrite(memory.ToArray());

Response.End();