C#：如何使 IEnumerableT 线程安全

public class ThreadSafeEnumerable : IEnumerable
{
    private readonly IEnumerable _innerEnumerable;
    private object _lock = new object();
    public ThreadSafeEnumerable(IEnumerable innerEnumerable)
    {
        _innerEnumerable = innerEnumerable;
    }
    public IEnumerator GetEnumerator()
    {
        lock (_lock)
        {
            return _innerEnumerable.GetEnumerator();
        }
    }
    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
}

public class ThreadSafeEnumerable : IEnumerable
{
    private readonly ConcurrentBag _innerBag;
    public ThreadSafeEnumerable(IEnumerable innerEnumerable)
    {
        _innerBag = new ConcurrentBag(innerEnumerable);
    }
    public IEnumerator GetEnumerator()
    {
        return _innerBag.GetEnumerator();
    }
    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
}