EmptyContent.cs

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using System.IO;
using System.Threading;
using System.Threading.Tasks;
 
namespace System.Net.Http;
 
internal sealed class EmptyContent : HttpContent
{
    internal override bool AllowDuplex => false;
 
    protected internal override bool TryComputeLength(out long length)
    {
        length = 0L;
        return true;
    }
 
    protected override void SerializeToStream(Stream stream, TransportContext context, CancellationToken cancellationToken)
    {
    }
 
    protected override Task SerializeToStreamAsync(Stream stream, TransportContext context)
    {
        return Task.CompletedTask;
    }
 
    protected override Task SerializeToStreamAsync(Stream stream, TransportContext context, CancellationToken cancellationToken)
    {
        if (!cancellationToken.IsCancellationRequested)
        {
            return SerializeToStreamAsync(stream, context);
        }
        return Task.FromCanceled(cancellationToken);
    }
 
    protected override Stream CreateContentReadStream(CancellationToken cancellationToken)
    {
        return EmptyReadStream.Instance;
    }
 
    protected override Task<Stream> CreateContentReadStreamAsync()
    {
        return Task.FromResult((Stream)EmptyReadStream.Instance);
    }
 
    protected override Task<Stream> CreateContentReadStreamAsync(CancellationToken cancellationToken)
    {
        if (!cancellationToken.IsCancellationRequested)
        {
            return CreateContentReadStreamAsync();
        }
        return Task.FromCanceled<Stream>(cancellationToken);
    }
 
    internal override Stream TryCreateContentReadStream()
    {
        return EmptyReadStream.Instance;
    }
}