How can I send and receive a large file over HTTP in C#

Question

I am working on developing an HTTP Server/Client and I can currently send small files over it such as .txt files and other easy to read files that do not require much memory. However when I want to send a larger file say a .exe or large .pdf I get memory errors. This are occurring from the fact that before I try to send or receive a file I have to specify the size of my byte[] buffer. Is there a way to get the size of the buffer while reading it from stream?

I want to do something like this:

//Create the stream. private Stream dataStream = response.GetResponseStream(); //read bytes from stream into buffer. byte[] byteArray = new byte[Convert.ToInt32(dataStream.Length)]; dataStream.read(byteArray,0,byteArray.Length);

However when calling "dataStream.Length" it throws the error:

 ExceptionError: This stream does not support seek operations.

Can someone offer some advice as to how I can get the length of my byte[] from the stream?

Thanks,

I4V · Accepted Answer · 2013-07-04 20:01:45Z

You can use CopyTo method of the stream.

MemoryStream m = new MemoryStream(); dataStream.CopyTo(m); byte[] byteArray = m.ToArray();

You can also write directly to file

var fs = File.Create("...."); dataStream.CopyTo(fs);

SLaks · Accepted Answer · 2013-07-04 19:51:34Z

The network layer has no way of knowing how long the response stream is.

However, the server is supposed to tell you how long it is; look in the Content-Length response header.
If that header is missing or incorrect, you're out of luck; you'll need to keep reading until you run out of data.

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