C# How to make public getters and setters and private methods for a collection?

Question

I\'d like to have a class \"A\" with a (for example) SortedList collection \"SrtdLst\" property, and inside this class \"A\" allow the addition or subtraction of \"SrtdLst\" ite

Answer 1

Just make the list private, and expose it as an indexer:

class A {

   private SortedList _list;

   public A() {
      _list = new SortedList()
   }

   public string this[string key] {
      get {
         return _list[key];
      }
      set {
         _list[key] = value;
      }
   }

}

Now you can only access the items using the index:

a["KeyA"] = "ValueBBB";

However, as the indexer of the list allows creation of new items, you would have to add code in the indexer to prevent that if you don't want that do be possible.