ObservableCollection中的C#相等

public class ObservableCollectionEqualityComparer<T> : IEqualityComparer<ObservableCollection<T>>
{
    public bool Equals(ObservableCollection<T> x, ObservableCollection<T> y)
    {
        if (x == null && y == null)
            return true;
        if (x == null || y == null)
            return false;
        if (x.Count != y.Count)
            return false;
        for (int i = 0; i < x.Count; i++)
        {
            if (!x[i].Equals(y[i]))
                return false;
        }
        return true;
    }

    public int GetHashCode(ObservableCollection<T> obj)
    {
        int hashCode = 0;
        foreach (var item in obj)
        {
            hashCode ^= item.GetHashCode();
        }
        return hashCode;
    }
}

var comparer = new ObservableCollectionEqualityComparer<int>();
var collection1 = new ObservableCollection<int> { 1, 2, 3 };
var collection2 = new ObservableCollection<int> { 1, 2, 3 };
var collection3 = new ObservableCollection<int> { 1, 2, 4 };

bool isEqual1 = comparer.Equals(collection1, collection2);  // true
bool isEqual2 = comparer.Equals(collection1, collection3);  // false