实现IDictionary接口

下面是实现了IDictionary接口的类

   public class SerializeDictionary : IDictionary    {              #region 类成员、方法、构造器        private DictionaryEntry[] Items;        private Int32 ItemCount=0;        public SerializeDictionary(Int32 itemCount)        {            this.Items = new DictionaryEntry[itemCount];        }        private Boolean TryGetIndexOfKey(Object key, out Int32 index)        {            for (index = 0; index < ItemCount; index++)            {                if (this.Items[index].Key.Equals(key))                {                    return true;                }            }            return false;        }        #endregion        #region IDictionary 成员        public void Add(object key, object value)        {            if(Items.Length>ItemCount)                        this.Items[ItemCount + 1] = new DictionaryEntry(key, value);        }        public void Clear()        {            this.ItemCount = 0;            this.Items = null;        }        public bool Contains(object key)        {            Int32 index;            return this.TryGetIndexOfKey(key,out index);        }        public IDictionaryEnumerator GetEnumerator()        {            return new DictionaryEnumertor(this);        }        public bool IsFixedSize        {            get { return false; }        }        public bool IsReadOnly        {            get { return false; }        }        public ICollection Keys        {            get             {                Object[] Keys = new Object[ItemCount];                for (Int32 i = 0; i < ItemCount; i++)                Keys[i] = Items[i].Key;                return Keys;            }        }        public void Remove(object key)        {            Int32 index;            if (TryGetIndexOfKey(key, out index))            {                Array.Copy(this.Items,index+1,Items,index,ItemCount-index-1);                ItemCount--;            }        }        public ICollection Values        {            get             {                Object[] Values = new Object[ItemCount];                for (int i = 0; i < ItemCount; i++)                Values[i] = Items[i].Value;                return Values;            }        }        public object this[object key]        {            get            {                Int32 index;               if(TryGetIndexOfKey(key,out index))               return Items[index].Value;               return null;                            }            set            {               Int32 index;               if(TryGetIndexOfKey(key, out index))               this.Items[index].Value = value;               this.Add(key,value);            }        }        #endregion        #region ICollection 成员        public void CopyTo(Array array, int index)        {            if (index > array.Length||array==null)                        throw new NotImplementedException("index Or array has error!");            Array.Copy(this.Items, index + 1, array, index, ItemCount - index - 1);        }        public int Count        {            get { return this.ItemCount; }        }        public bool IsSynchronized        {            get { return true; }        }        public object SyncRoot        {            get             {                lock (this)                 {                    if (this.Items == null)                                        throw new NotImplementedException("Is Null");                    return new SerializeDictionary(100);                }                            }        }        #endregion        #region IEnumerable 成员        /// <summary>        /// dsaaaaaaaaaaaaaaaaaaaa        /// </summary>        /// <returns></returns>        IEnumerator IEnumerable.GetEnumerator()        {            return this.Items.GetEnumerator();        }        #endregion        #region 用于迭代的嵌套类        private class DictionaryEnumertor : IDictionaryEnumerator        {            DictionaryEntry[] Items;            Int32 index = -1;            public DictionaryEnumertor(SerializeDictionary sd)            {                Items = new DictionaryEntry[sd.Count];                Array.Copy(sd.Items, 0, Items, 0, sd.Count);            }            #region IDictionaryEnumerator 成员            public DictionaryEntry Entry            {                get                {                    return (DictionaryEntry)Items[index];                }            }            public object Key            {                get                {                    return Items[index].Key;                }            }            public object Value            {                get                {                    return Items[index].Value;                }            }            #endregion            #region IEnumerator 成员            public object Current            {                get                {                    return Items[index];                }            }            public bool MoveNext()            {                if (index < Items.Length - 1)                {                    index++; return true;                }                return false;            }            public void Reset()            {                index = -1;            }            #endregion        }        #endregion    }