IEqualityComparer <T> GetHashCode在项目不相等时返回相同的值？

public class MyObjectEqualityComparer : IEqualityComparer<MyObject>
{
    public bool Equals(MyObject x, MyObject y)
    {
        if (x == null && y == null) return true;
        if (x == null || y == null) return false;

        return x.Property1 == y.Property1 && x.Property2 == y.Property2;
    }

    public int GetHashCode(MyObject obj)
    {
        if (obj == null) return 0;

        int hashProperty1 = obj.Property1.GetHashCode();
        int hashProperty2 = obj.Property2.GetHashCode();

        return hashProperty1 ^ hashProperty2;
    }
}