Enumerable.SetEqual<T> extension

gistfile1.cs

/// <summary>
/// An order independent version of <see cref="Enumerable.SequenceEqual{TSource}(System.Collections.Generic.IEnumerable{TSource},System.Collections.Generic.IEnumerable{TSource})"/>.
/// </summary>
internal static bool SetEqual<T>(this IEnumerable<T> x, IEnumerable<T> y)
{
    if (x == null) throw new ArgumentNullException("x");
    if (y == null) throw new ArgumentNullException("y");
    
    var objectsInX = x.ToList();
    var objectsInY = y.ToList();

    if (objectsInX.Count() != objectsInY.Count())
        return false;

    foreach (var objectInY in objectsInY)
    {
        if (!objectsInX.Contains(objectInY))
            return false;

        objectsInX.Remove(objectInY);
    }

    return objectsInX.Empty();
}