public bool Remove(TKey key) {
            if(key == null) {
                ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key);
            }
            if (buckets != null) {
                int hashCode = comparer.GetHashCode(key) & 0x7FFFFFFF;
                int bucket = hashCode % buckets.Length;
                int last = -1;
                //其原理先取出键值，然后记录entries空闲的索引（freeList）和空闲个数（freeCount）
                for (int i = buckets[bucket]; i >= 0; last = i, i = entries[i].next)  {
                    if (entries[i].hashCode == hashCode &&  comparer.Equals(entries[i].key, key)) {
                        if (last < 0) {
                            buckets[bucket] = entries[i].next;
                        }
                        else {
                            entries[last].next = entries[i].next;
                        }
                        entries[i].hashCode = -1;
                        //建立空闲链表
                        entries[i].next = freeList;
                        entries[i].key = default(TKey);
                        entries[i].value = default(TValue);
                        //保存entryies中空元素的索引
                        //便于插入新键值时，放在当前索引的位置，减少entryies空间上的浪费
                        freeList = i;
                        //空元素的个数加1
                        freeCount++;
                        version++;
                        return true;
                    }
                }
            }
            return false;
        }
*******************************************************************
        static void Foo()
        {
            ......
            //移除
            new List<int> { 22, 29 }.ForEach(item => dicData.Remove(item));
        }