C# 设计模式（13）代理模式

代理模式

1. 基于开闭原则 OCP： 对扩展开放，对修改封闭。

购物类：

namespace ProxyPattern
{
    public interface IShopping
    {
        void ChoiceProduct(string product);
        void PayForProduct();
        public string GetCurrentProducts();
    }
    public class Shopping : IShopping
    {
        private readonly List<string> _productList = new List<string>();

        public void ChoiceProduct(string product)
        {
            if (!string.IsNullOrEmpty(product))
            {
                _productList.Add(product);
                Console.WriteLine($"You has choiced {product}");
            }
        }

        public void PayForProduct()
        {
            foreach (var product in _productList)
            {
                Console.WriteLine($"You has bought {product}");
            }
        }

        public string GetCurrentProducts()
        {
            string allProducts = "";
            foreach (string item in _productList)
            {
                allProducts += item + " ";
            }
            return allProducts;
        }
    }
}

代理类：

    public class ProxyShopping
    {
        private readonly IShopping _shopping = new Shopping();

        public void ChoiceProduct(string product)
        {
            _shopping.ChoiceProduct(product);
            Console.WriteLine($"Add [choice {product}] Debug Log.");
        }

        public void PayForProduct()
        {
            _shopping.PayForProduct();
            Console.WriteLine($@"Add [pay for {_shopping.GetCurrentProducts()}] Debug Log.");
        }
    }

代码调用：

    class Program
    {
        static void Main(string[] args)
        {
            ProxyShopping proxyShopping = new ProxyShopping();
            proxyShopping.ChoiceProduct("Clothes");
            proxyShopping.ChoiceProduct("PC");
            proxyShopping.PayForProduct();
        }
    }

结果：