將PDF流寫入響應流

Question

如果我有一個PDF文件作爲Stream，我該如何將它寫入響應輸出流？

Answer 1

由於您使用MVC，最好的辦法是使用FileStreamResult：

return new FileStreamResult(stream, "application/pdf") 
{ 
    FileDownloadName = "file.pdf" 
}; 

與控制器Response.Write或Response.OutputStream打非慣用的和沒有理由的時候已經存在一個寫自己的ActionResult 。

Answer 2

請試試這個：

protected void Page_Load(object sender, EventArgs e) { 
     Context.Response.Buffer = false; 
     FileStream inStr = null; 
     byte[] buffer = new byte[1024]; 
     long byteCount; inStr = File.OpenRead(@"C:\Users\Downloads\sample.pdf"); 
     while ((byteCount = inStr.Read(buffer, 0, buffer.Length)) > 0) { 
      if (Context.Response.IsClientConnected) { 
       Context.Response.ContentType = "application/pdf"; 
       Context.Response.OutputStream.Write(buffer, 0, buffer.Length); 
       Context.Response.Flush(); 
      } 
     } 
    } 

Answer 3

一種方式做到這一點如下：

//assuming you have your FileStream handle already - named fs 
byte[] buffer = new byte[4096]; 
long count = 0; 

while ((count = fs.Read(buffer, 0, buffer.Length)) > 0) 
{ 
    response.OutputStream.Write(buffer, 0, count); 
    response.Flush(); 
} 

您還可以使用GZIP壓縮，以加快文件傳輸到客戶端（少流式傳輸）。

Answer 4

HTTP響應是通過HttpContext.Response.OutputStream屬性暴露給你一個流，所以如果你有PDF文件流，你可以簡單地將數據從一個流複製到其他：

CopyStream(pdfStream, response.OutputStream); 

對於實施CopyStream看到Best way to copy between two Stream instances - C#

Answer 5

在asp.net這是下載一個PDF文件

Dim MyFileStream As FileStream 
    Dim FileSize As Long 

    MyFileStream = New FileStream(filePath, FileMode.Open) 
    FileSize = MyFileStream.Length 

    Dim Buffer(CInt(FileSize)) As Byte 
    MyFileStream.Read(Buffer, 0, CInt(FileSize)) 
    MyFileStream.Close() 

    Response.ContentType = "application/pdf" 
    Response.OutputStream.Write(Buffer, 0, FileSize) 
    Response.Flush() 
    Response.Close()