Question

How to compare two List<MyObject1> with List<MyObject2>?
So if one the Value has different value it should be possible to check it.

(I know we can use foreach… But I’d like LINQ solution/)

Thank you!

public sealed class MyObject1
{
    public string Name { get; set; }

    public string Value { set; get; }

    public Guid ID { get; set; }
}

public sealed class MyObject2
{
    public string Name { get; set; }

    public string Value { set; get; }

    public Guid ID { get; set; }
}

Answer 1

public class myComparer: IEqualityComparer  
{
   public new bool Equals(object x, object y)
   {
      if (x is string )
         return  x ==   y;
      else if (x is Guid ) // maybe you want them to be equal if last char is equal. so you can do it here.
         return   x ==   y;
      else
         return EqualityComparer<object>.Default.Equals(x, y);
   }

   public int GetHashCode(object obj)
   {
      return EqualityComparer<object>.Default.GetHashCode(obj);
   }
}

---

now

List<MyObject1 > lst1 = new MyObject1 <MyObject1 >(); 
//add items here...

List<MyObject2 > lst2 = new MyObject1 <MyObject2 >(); 
//add items here...

you can equate 2 ways :

IStructuralEquatable equ = lst1 ;

  Console.WriteLine(equ.Equals(lst2 , EqualityComparer<object>.Default));

   or

   Console.WriteLine(equ.Equals(lst2 , new myComparer()));