App_Code/ShoppingCart/Cart.cs

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namespace BLL.ShoppingCart
{
    using System;
    using System.Collections.Generic;
    using System.Text;

    public class Cart
    {
        Dictionary<string, Product> ProList = new Dictionary<string, Product>();

        private const string ItemDelimiter = "$$";//项分隔符
        private const string ColumnDelimiter = "@@";//字段分隔符

        public void Add(Product pro)
        {
            if (!ProList.ContainsKey(pro.Num))
            {
              
                ProList.Add(pro.Num, pro);
            }
        }
        public bool Exist(string num)
        {
            if (ProList.ContainsKey(num))
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        public Dictionary<string, Product> Values
        {
            get { return ProList; }
            set { ProList = value; }
        }
        public Product this[string num]
        {
            get
            {
                if (ProList.ContainsKey(num))
                {
                    return ProList[num];
                }
                else
                {
                    return new Product();
                }
            }
        }
        public void Remove(string num)
        {
            if (ProList.ContainsKey(num))
            {
                ProList.Remove(num);
            }
        }