How to make IEnumerable readonly?

Question

Why are the lists list1Instance and p in the Main method of the below code pointing to the same collection?

class Person
         


        

Answer 1

You could make a deepclone of each item in the list, and never return references to your original items.

public IEnumerable Get()
{
  return l1
    .Select(p => new Person(){
      FirstName = p.FirstName,
      LastName = p.LastName
    });
}