Design-Pattern/VisitorPattern/OrderCenter.cs

using System.Collections.Generic;

namespace VisitorPattern
{
    /// <summary>
    /// 订单中心
    /// </summary>
    public class OrderCenter : List<Order>
    {
        public void Accept(Visitor visitor)
        {
            var iterator = this.GetEnumerator();

            while (iterator.MoveNext())
            {
                iterator.Current.Accept(visitor);
            }
        }

    }
}