ReadAsync() [3/3]

override ValueTask< int > System.IO.BufferedStream.ReadAsync ( Memory< byte > buffer, CancellationToken cancellationToken = default(CancellationToken) )

inlinevirtual

Reimplemented from System.IO.Stream.

Definition at line 468 of file BufferedStream.cs.

    {
        if (cancellationToken.IsCancellationRequested)
        {
            return ValueTask.FromCanceled<int>(cancellationToken);
        }
        EnsureNotClosed();
        EnsureCanRead();
        int num = 0;
        SemaphoreSlim semaphoreSlim = EnsureAsyncActiveSemaphoreInitialized();
        Task task = semaphoreSlim.WaitAsync(cancellationToken);
        if (task.IsCompletedSuccessfully)
        {
            bool flag = true;
            try
            {
                num = ReadFromBuffer(buffer.Span);
                flag = num == buffer.Length;
                if (flag)
                {
                    return new ValueTask<int>(num);
                }
            }
            finally
            {
                if (flag)
                {
                    semaphoreSlim.Release();
                }
            }
        }
        return ReadFromUnderlyingStreamAsync(buffer.Slice(num), cancellationToken, num, task);
    }

References System.buffer, System.cancellationToken, System.IO.Stream.EnsureAsyncActiveSemaphoreInitialized(), System.IO.BufferedStream.EnsureCanRead(), System.IO.BufferedStream.EnsureNotClosed(), System.Threading.Tasks.ValueTask< TResult >.FromCanceled(), System.IO.BufferedStream.ReadFromBuffer(), System.IO.BufferedStream.ReadFromUnderlyingStreamAsync(), System.Threading.SemaphoreSlim.Release(), System.task, and System.Threading.SemaphoreSlim.WaitAsync().