在给定任务返回ReadAsync的情况下，重写Stream.BeginRead的正确方法是什么

using System;
using System.IO;
using System.Threading.Tasks;

public class AsyncStream : Stream
{
    private Stream _innerStream;

    public AsyncStream(Stream innerStream)
    {
        _innerStream = innerStream ?? throw new ArgumentNullException(nameof(innerStream));
    }

    public override async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
    {
        return await Task.Factory.FromAsync<int>(
            _innerStream.BeginRead,
            _innerStream.EndRead,
            buffer,
            offset,
            count,
            null
        );
    }

    // Implement other required Stream methods with their synchronous counterparts
    public override int Read(byte[] buffer, int offset, int count)
    {
        return _innerStream.Read(buffer, offset, count);
    }

    // Implement other required Stream methods...
}