public SynchronizedDictionary(SynchronizedKeyedCollection <TKey, TValue> parent,
                               IEqualityComparer <TKey> comparer, ReaderWriterLockWrapper @lock)
     : base(comparer, @lock)
 {
     this.parent = parent;
 }
 public SynchronizedDictionary(SynchronizedKeyedCollection <TKey, TValue> parent, ReaderWriterLockWrapper @lock)
     : base(@lock)
 {
     this.parent = parent;
 }