将PDF流写入响应流

Question

如果我有一个PDF文件作为Stream，我该如何将它写入响应输出流？

Answer 1

由于您使用MVC，最好的办法是使用FileStreamResult：

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

与控制器Response.Write或Response.OutputStream打非惯用的和没有理由的时候已经存在一个写自己的ActionResult 。

Answer 2

请试试这个：

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

一种方式做到这一点如下：

//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(); 
} 

您还可以使用GZIP压缩，以加快文件传输到客户端（少流式传输）。

Answer 4

HTTP响应是通过HttpContext.Response.OutputStream属性暴露给你一个流，所以如果你有PDF文件流，你可以简单地将数据从一个流复制到其他：

CopyStream(pdfStream, response.OutputStream); 

对于实施CopyStream看到Best way to copy between two Stream instances - C#

Answer 5

在asp.net这是下载一个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()