Question

I have two List, this complex object has 4 public properties of reference type.
How can i compare one list to another to find if those lists are equal in size and by values.

I have implemented Equals in ComplexObject in order to help with equality checks

public Type1 Type1 { get; set; }
public IEnumerable<Type2> Type2s{ get; set; }
public Type3 Type3{ get; set; }
public Type4 Type4 { get; set; }

public bool Equals(ComplexObject complexObject)
{
    int type2sCount = Type2s.Count();
    return Type1 .Equals(complexObject.Type1) &&
        Type3.Equals(complexObject.Type3) &&
        Type4.Equals(complexObject.Type4) &&
        Type2s.Intersect(complexObject.Type2s).Count() == type2sCount;
}

I need also to print out items that do no fit or have no pair in second list

Thanks

Answer 1

The simplest approach for the lists would be SequenceEqual, but you need to be careful about nulls:

public bool Equals(ComplexObject complexObject)
{
    bool eq = Equals(Type1, complexObject.Type1)
        && Equals(Type3, complexObject.Type3)
        && Equals(Type4, complexObject.Type4);
    if (eq)
    {
        if(Type2s == null)
        {
            if(complexObject.Type2s != null) eq = false;
        } else {
            eq = complexObject.Type2s == null ? false
               : Type2s.SequenceEqual(complexObject.Type2s);
        }
    }
    return eq;
}