Can i have a generic indexer this[TKey key] property? it requiers only int why?

[m.scofield]

 public class MyDictionary<TKey, TValue> : MyIDictionary<TKey, TValue>
    {
        private object[] _items;
        //private int index = 0;
        public MyDictionary()
        {
            _items = new object[10];
        }


        public TValue this[TKey key]
        {
            get
            {
                return (TValue)_items[key];//cannot implicitly convert type 'TKey' to 'int'
            }
            set
            {
                _items[key] = value;
            }
        }

[whiteflags]

You can do it, but where you went wrong is that an array of objects expects the index to be an int. You have to search the array _items yourself and return the right object.

Maybe something like this is a good start.

public class MyDictionary<TKey, TValue> : MyIDictionary<TKey, TValue>
{
   private KeyValuePair<TKey, TValue>[] _items;
   private int index = 0;
   public MyDictionary()
   {
       _items = new KeyValuePair<TKey, TValue>[10];
   }


   public TValue this[TKey key]
   {
       get
       {
           foreach (KeyValuePair<TKey, TValue> kvp in _items)
           {
                  if (key.Equals(kvp.Key))
                     return kvp.Value;
           }
           throw new System.ArgumentOutOfRangeException(key.ToString(), "not in dictionary");
       }
       set
       {
           _items[index] = new KeyValuePair<TKey, TValue>(key, value);
           ++index;
       }
   }
}

Nothing was tested.