Send and receive large file over streams in ASP.NE

问题:

I'm working on a project where I need to send large audio files via streams from a client to a server. I'm using the ASP.NET Web Api to communicate between client and server. My client has a "SendFile" method which I believe works fine, but I don't know how to make my server receive the data I'm sending via a stream. My client code looks like this so far:

 private const int MAX_CHUNK_SIZE = (1024 * 5000);
    private HttpWebRequest webRequest = null;
    private FileStream fileReader = null;
    private Stream requestStream = null;

    public bool SendAudio(string uri, string file)
    {
        byte[] fileData;
        fileReader = new FileStream(file, FileMode.Open, FileAccess.Read);
        webRequest = (HttpWebRequest)WebRequest.Create(uri);
        webRequest.Method = "POST";
        webRequest.ContentLength = fileReader.Length;
        webRequest.Timeout = 600000;
        webRequest.Credentials = CredentialCache.DefaultCredentials;
        webRequest.AllowWriteStreamBuffering = false;
        requestStream = webRequest.GetRequestStream();

        long fileSize = fileReader.Length;
        long remainingBytes = fileSize;
        int numberOfBytesRead = 0, done = 0;

        while (numberOfBytesRead < fileSize)
        {
            SetByteArray(out fileData, remainingBytes);
            done = WriteFileToStream(fileData, requestStream);
            numberOfBytesRead += done;
            remainingBytes -= done;
        }
        fileReader.Close();
        return true;
    }

    public int WriteFileToStream(byte[] fileData, Stream requestStream)
    {
        int done = fileReader.Read(fileData, 0, fileData.Length);
        requestStream.Write(fileData, 0, fileData.Length);

        return done;
    }

    private void SetByteArray(out byte[] fileData, long bytesLeft)
    {
        fileData = bytesLeft < MAX_CHUNK_SIZE ? new byte[bytesLeft] : new byte[MAX_CHUNK_SIZE];
    }

My server looks like this:

    [HttpPost]
    [ActionName("AddAudio")]
    public async Task<IHttpActionResult> AddAudio([FromUri]string name)
    {
        try
        {
            isReceivingFile = true;
            byte[] receivedBytes = await Request.Content.ReadAsByteArrayAsync();
            if (WriteAudio(receivedBytes, name) == true)
            {
                isReceivingFile = false;
                return Ok();
            }
            else
            {
                isReceivingFile = false;
                return BadRequest("ERROR: Audio could not be saved on server.");
            }
        }
        catch (Exception ex)
        {
            isReceivingFile = false;
            return BadRequest("ERROR: Audio could not be saved on server.");
        }
    }

    public bool WriteAudio(byte[] receivedBytes, string fileName)
    {
        string file = Path.Combine(@"C:\Users\username\Desktop\UploadedFiles", fileName);
        using (FileStream fs = File.Create(file))
        {
            fs.Write(receivedBytes, 0, receivedBytes.Length);
        }
        return true;
    }

The server code has the original code I wrote for it, before deciding to try and make it work with streams. The server code still works if I send a small file (under 30 MB), but if I send a large file my server gets a "outofmemoryexception". I can't figure out how to make the server take in the data via a stream. In my search for solutions I've come across a lot of examples with sockets and TCPClient, but that's not how we want to do it on this project. Can anybody help, please?

回答1:

if I send a large file my server gets a "outofmemoryexception"

Well, it's reading the entire stream into memory right here:

byte[] receivedBytes = await Request.Content.ReadAsByteArrayAsync();

What you want to do is copy the stream from one location to another, without loading it all into memory at once. Something like this should work:

[HttpPost]
[ActionName("AddAudio")]
public async Task<IHttpActionResult> AddAudio([FromUri]string name)
{
  try
  {
    string file = Path.Combine(@"C:\Users\username\Desktop\UploadedFiles", fileName);
    using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write,
        FileShare.None, 4096, useAsync: true))
    {
      await Request.Context.CopyToAsync(fs);
    }
    return Ok();
  }
  catch (Exception ex)
  {
    return BadRequest("ERROR: Audio could not be saved on server.");
  }
}