C#: List add object initializer

Lets say I have this class:

class MyList<T>
{

}

What must I do to that class, to make the following possible:

var list = new MyList<int> {1, 2, 3, 4};

From stackoverflow

• Have an Add method and implement IEnumerable.

  class MyList<T> : IEnumerable
  {
    public void Add(T t)
    {
  
    }
  
    public IEnumerator GetEnumerator()
    {
      //...
    }
  }
  
  public void T()
  {
    MyList<int> a = new MyList<int>{1,2,3};
  }
  

  JaredPar : +1, you may want to add that it must take a parameter of the type in the collection.

  RossFabricant : Actually, that's not true. It would be weird, but your Add method does not need to take type T. It could be: public void Add(string t, char c){} and you could call MyList a = new MyList{{"A", 'c'}, {"B", 'd'}};

• Implementing ICollection on MyList will let the initalizer syntax work

  class MyList : ICollection

  Although the bare minimum would be:

  public class myList<T> : IEnumerable<T>
  {
  
      public void Add(T val)
      {
      }
  
      public IEnumerator<T> GetEnumerator()
      {
      }
  
      System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
      {
      }
  
  
  }
  

• ICollection<T> is also good.