原來一直是給地址讓前端進行呼叫,但安全性不好,且無法記載下載和閱覽次數,因此使用檔案流供檢視(僅pdf),下載

檢視

var file = File.OpenRead(path);//讀取檔案,path為路徑
MemoryStream stream = new MemoryStream(); //建立流
file.CopyTo(stream);

var buf = stream.ToArray();
var fileName = $"{mes.fileName}.pdf";

HttpContext.Current.Response.Clear();
HttpContext.Current.Response.ContentType 
 
= $"application/pdf";
HttpContext.Current.Response.AddHeader("Content-Disposition", $"inline; filename={fileName}");
HttpContext.Current.Response.BinaryWrite(buf);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.Close();

下載

var file = File.OpenRead(path);
MemoryStream stream = new
 
 MemoryStream(); //建立流
file.CopyTo(stream);

var buf = stream.ToArray();
var fileName = $"{mes.fileName}{extension}";
//流方式下載檔案
HttpContext.Current.Response.ContentType = "application/octet-stream";
//通知瀏覽器下載檔案
HttpContext.Current.Response.AddHeader("Content-Disposition",
$"attachment; filename={HttpUtility.UrlEncode(fileName)}
 
");
HttpContext.Current.Response.BinaryWrite(buf);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();