C# 电子商务系统开发：用户、商品、订单、支付、购物车、售后服务、仓库、钱包实现

//用户类 public class User { public string Name { get; set; } public string Password { get; set; } public ShoppingCart Cart { get; set; } public Wallet Wallet { get; set; }

public User(string name, string password)
{
    Name = name;
    Password = password;
    Cart = new ShoppingCart();
    Wallet = new Wallet();
}

public void Register()
{
    //注册逻辑
}

public bool Login()
{
    //登录逻辑
    return true;
}

public void Pay(PaymentTool tool, Order order)
{
    Wallet.Pay(tool, order);
}

public void Return(Order order)
{
    //退货逻辑
}

public void Exchange(Order order)
{
    //换货逻辑
}

}

//商品类 public class Product { public string Name { get; set; } public string Type { get; set; } public decimal Price { get; set; } public string Description { get; set; } }

//订单类 public class Order { public Product Product { get; set; } public User User { get; set; } public int Quantity { get; set; } public string Address { get; set; } }

//支付工具类 public abstract class PaymentTool { public abstract void Pay(decimal amount); public abstract void Receive(decimal amount); }

//支付宝类 public class Alipay : PaymentTool { public override void Pay(decimal amount) { //支付宝支付逻辑 }

public override void Receive(decimal amount)
{
    //支付宝收款逻辑
}

}

//银行卡类 public class BankCard : PaymentTool { public override void Pay(decimal amount) { //银行卡支付逻辑 }

public override void Receive(decimal amount)
{
    //银行卡收款逻辑
}

}

//购物车类 public class ShoppingCart { private Dictionary<Product, int> products = new Dictionary<Product, int>();

public void AddProduct(Product product, int quantity)
{
    if (products.ContainsKey(product))
    {
        products[product] += quantity;
    }
    else
    {
        products.Add(product, quantity);
    }
}

public void RemoveProduct(Product product, int quantity)
{
    if (products.ContainsKey(product))
    {
        if (products[product] >= quantity)
        {
            products[product] -= quantity;
        }
        else
        {
            throw new Exception('购物车中没有足够的商品');
        }
    }
    else
    {
        throw new Exception('购物车中没有该商品');
    }
}

}

//钱包类 public class Wallet { private List paymentTools = new List();

public void BindPaymentTool(PaymentTool tool)
{
    paymentTools.Add(tool);
}

public void UnbindPaymentTool(PaymentTool tool)
{
    paymentTools.Remove(tool);
}

public void Pay(PaymentTool tool, Order order)
{
    tool.Pay(order.Product.Price * order.Quantity);
}

public void Receive(PaymentTool tool, decimal amount)
{
    tool.Receive(amount);
}

}

//售后服务类 public class CustomerService { public void Return(Order order) { Warehouse.Inbound(order.Product, order.Quantity); order.User.Wallet.Receive(new Alipay(), order.Product.Price * order.Quantity); }

public void Exchange(Order order)
{
    Warehouse.Inbound(order.Product, order.Quantity);
    Warehouse.Outbound(new Product(), order.Quantity);
}

}

//仓库类 public sealed class Warehouse { private static Warehouse instance = null; private static readonly object padlock = new object();

private Dictionary<Product, int> products = new Dictionary<Product, int>();

public static Warehouse Instance
{
    get
    {
        lock (padlock)
        {
            if (instance == null)
            {
                instance = new Warehouse();
            }
            return instance;
        }
    }
}

public void Inbound(Product product, int quantity)
{
    if (products.ContainsKey(product))
    {
        products[product] += quantity;
    }
    else
    {
        products.Add(product, quantity);
    }
}

public void Outbound(Product product, int quantity)
{
    if (products.ContainsKey(product))
    {
        if (products[product] >= quantity)
        {
            products[product] -= quantity;
        }
        else
        {
            throw new Exception('库存不足');
        }
    }
    else
    {
        throw new Exception('库存不足');
    }
}

}