public override async Task <AsyncDisposableValue <Stream> > OpenWriteAsync(CancellationToken cancellationToken = new CancellationToken())
{
var stream = new MemoryStream(InitialCapacity);
return(new AsyncDisposableValue <Stream>(stream, async() =>
{
stream.Seek(0, SeekOrigin.Begin);
await BlockBlob.UploadFromStreamAsync(stream, cancellationToken);
}));
}
