Question

如果我将pdf文件作为Stream，我该如何将其写入响应输出流？

Answer 1

由于您使用的是MVC，最好的方法是使用FileStreamResult：

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

从您的控制器中使用Response.Write或Response.OutputStream是非惯用的，并且没有理由在已经存在的情况下编写自己的ActionResult。

Answer 2

一种方法如下：

//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压缩来加速文件到客户端的传输（流式传输的字节数更少）。

Answer 3

HTTP响应是通过HttpContext.Response.OutputStream属性向您公开的流，因此如果您在流中包含PDF文件，则只需将数据从一个流复制到另一个流：

CopyStream(pdfStream, response.OutputStream);

有关CopyStream的实施，请参阅Best way to copy between two Stream instances - C#

Answer 4

在asp.net中，这是下载pdf文件的方法

    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()

Answer 5

请尝试这个：

    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();
            }
        }
    }

将PDF流写入响应流

5 个答案: