Asp中上传文件

    

 string fileName = @"C:\Users\ITCA\Desktop\新建Excel.xlsx";
            Response.Clear();
           
            Response.ContentType = "application/excel";


            FileInfo file = new FileInfo(fileName);

            string name=HttpUtility .UrlEncode ("新建Excel");

            
            Response.AddHeader("Content-Disposition", "attachment; filename="+name+".xlsx" );
            Response.AddHeader("Content-Length", file.Length.ToString());

               
            Response.WriteFile(fileName);
            Response.End();
           

  设置响应报文 

   contentType

   　　　　报头

Response.AddHeader("Content-Disposition", "attachment; filename="+name+".xlsx" );            

显示文件大小  可以看到下载进度s

  Response.AddHeader("Content-Length", file.Length.ToString());