1 public interface IEnumerator {2     object Current { get; }3     bool MoveNext();4     void Reset();5 }

1 public interface IEnumerable {2     IEnumerator GetEnumerator();3 }

1 public interface ICollection : IEnumerable {2     int Count { get; }3     object SyncRoot { get; }4     bool IsSynchronized { get; }5     void CopyTo(Array array, int index);6 }

1 public struct KeyValuePair
     
       {2     public KeyValuePair(TKey key,TValue value);3     public TKey Key { get; }4     public TValue Value { get; }5     public override string ToString();6 }
     

1 public struct DictionaryEntry {2     public DictionaryEntry(object key,object value);3     public object Key { get; set; }4     public object Value { get; set; }5 }

1 public interface IDictionary : ICollection,IEnumerable { 2     object this[object key] { get; set; } 3     ICollection Keys { get; } 4     ICollection Values { get; } 5     bool IsReadOnly { get; } 6     bool IsFixedSize { get; } 7     void Add(object key,object value); 8     void Clear(); 9     bool Contains(object key);10     IDictionaryEnumerator GetEnumerator();11     void Remove(object key);12 }

1 public interface IDictionaryEnumerator : IEnumerator {2     object Key { get; }3     object Value { get; }4     DictionaryEntry Entry { get; }5 }