protected override async Task SerializeToStreamAsync(Stream stream, TransportContext context)
{
const int maxChars = 128; //it is empiric value measured using Console.WriteLine(builder.Length)
EncodingContext encodingContext = DefaultHttpEncoding;
using (var encodingBuffer = new ArrayRental <byte>(DefaultHttpEncoding.GetMaxByteCount(maxChars)))
{
//write start boundary
await stream.WriteStringAsync(DoubleDash + boundary + CrLf, encodingContext, (byte[])encodingBuffer).ConfigureAwait(false);
encodingContext.Reset();
var builder = new StringBuilder(maxChars);
//write each nested content
var writeDivider = false;
foreach (var entry in entries)
{
await EncodeHeadersToStreamAsync(stream, builder, entry, writeDivider, boundary, encodingContext, (byte[])encodingBuffer).ConfigureAwait(false);
encodingContext.Reset();
Debug.Assert(builder.Length <= maxChars);
writeDivider = true;
await entry.CopyToAsync(stream).ConfigureAwait(false);
}
//write footer
await stream.WriteStringAsync(CrLf + DoubleDash + boundary + DoubleDash + CrLf, encodingContext, (byte[])encodingBuffer).ConfigureAwait(false);
}
encodingContext.Reset();
}
