C#: HttpClient, File upload progress when uploading multiple file as MultipartFormDataContent

Question

I\'m using this code to upload multiple files and it working very well. It uses modernhttpclient library.

public async Task PostImages (int pla         


        

Answer 1

I have a working version of ProgressableStreamContent. Please note, I am adding headers in the constructor, this is a bug in original ProgressStreamContent that it does not add headers !!

internal class ProgressableStreamContent : HttpContent
{

    /// <summary>
    /// Lets keep buffer of 20kb
    /// </summary>
    private const int defaultBufferSize = 5*4096;

    private HttpContent content;
    private int bufferSize;
    //private bool contentConsumed;
    private Action<long,long> progress;

    public ProgressableStreamContent(HttpContent content, Action<long,long> progress) : this(content, defaultBufferSize, progress) { }

    public ProgressableStreamContent(HttpContent content, int bufferSize, Action<long,long> progress)
    {
        if (content == null)
        {
            throw new ArgumentNullException("content");
        }
        if (bufferSize <= 0)
        {
            throw new ArgumentOutOfRangeException("bufferSize");
        }

        this.content = content;
        this.bufferSize = bufferSize;
        this.progress = progress;

        foreach (var h in content.Headers) {
            this.Headers.Add(h.Key,h.Value);
        }
    }

    protected override Task SerializeToStreamAsync(Stream stream, TransportContext context)
    {

        return Task.Run(async () =>
        {
            var buffer = new Byte[this.bufferSize];
            long size;
            TryComputeLength(out size);
            var uploaded = 0;


            using (var sinput = await content.ReadAsStreamAsync())
            {
                while (true)
                {
                    var length = sinput.Read(buffer, 0, buffer.Length);
                    if (length <= 0) break;

                    //downloader.Uploaded = uploaded += length;
                    uploaded += length;
                    progress?.Invoke(uploaded, size);

                    //System.Diagnostics.Debug.WriteLine($"Bytes sent {uploaded} of {size}");

                    stream.Write(buffer, 0, length);
                    stream.Flush();
                }
            }
            stream.Flush();
        });
    }

    protected override bool TryComputeLength(out long length)
    {
        length = content.Headers.ContentLength.GetValueOrDefault();
        return true;
    }

    protected override void Dispose(bool disposing)
    {
        if (disposing)
        {
            content.Dispose();
        }
        base.Dispose(disposing);
    }

}

Also note, it expects HttpContent, not stream.

This is how you can use it.

 var progressContent = new ProgressableStreamContent (
     requestContent, 
     4096,
     (sent,total) => {
        Console.WriteLine ("Uploading {0}/{1}", sent, total);
    });