C＃ List＜T＞ 模板的案例

	public class List<T>
	{
		const int defaultCapacity = 4; //常量
		T[] items;//字段
		int count; //字段
		public List(int capacity = defaultCapacity)//构造函数
		{
			items = new T[capacity];
		}

		public int Count//属性
		{
			get { return count; }
		}
		public int Capacity//属性
		{
			get
			{
				return items.Length;
			}
			set
			{
				if (value < count) value = count;
				if (value != items.Length)
				{
					T[] newItems = new T[value];
					Array.Copy(items, 0, newItems, 0, count);
					items = newItems;
				}
			}
		}


		public T this[int index]//索引器
		{
			get
			{
				return items[index];
			}
			set
			{
				items[index] = value;
				OnChanged();
			}
		}

		public void Add(T item)//方法
		{
			if (count == Capacity) Capacity = count * 2;
			items[count] = item;
			count++;
			OnChanged();
		}
		protected virtual void OnChanged()//方法
		{
			if (Changed != null) Changed(this, EventArgs.Empty);
		}
		public override bool Equals(object other)//方法
		{
			return Equals(this, other as List<T>);
		}
		static bool Equals(List<T> a, List<T> b)//方法
		{
			if (a == null) return b == null;
			if (b == null || a.count != b.count) return false;
			for (int i = 0; i < a.count; i++)
			{
				if (!object.Equals(a.items[i], b.items[i]))
				{
					return false;
				}
			}
			return true;
		}

		public event EventHandler Changed; //事件
		public static bool operator ==(List<T> a, List<T> b)//运算符
		{
			return Equals(a, b);
		}
		public static bool operator !=(List<T> a, List<T> b)
		{
			return !Equals(a, b);
		}

	}