C#之链式编程（函数模式编程），最近很好像很火，我也尝试练习下。

学习链式编程 需要懂两个知识点：

1.必须会扩展方法

2.lambda+(Func,Action)

好了，下面是我的学习代码：

class Program    {        // study chained call 链式调用        static void Main(string[] args)        {            //One             //Product p = new Product() { ProductName = "iphone5", Price = 300 }.First().Sencond().Third();                        //Two            List
     
       list = new List
      
       ()            {                new Product{ProductName="iphone5",Price=300},                new Product{ProductName="iphone4s",Price=200},                new Product{ProductName="ipad4",Price=100}            };            var s = list.GetIphone
       
        (p =>            {                if (p.ProductName.Contains("iphone"))                {                    return p;                }                else                    return null;            }).getFirst
        
         ();            Console.WriteLine(s.Price);                        Console.ReadKey();                    }    }    public class Product    {        public string ProductName { get; set; }        public int Price { get; set; }        public Product First()        {            Console.WriteLine("First");            return this;        }        public Product Sencond()        {            Console.WriteLine("Second");            return this;        }        public Product Third()        {            Console.WriteLine("Third");            return this;        }    }    static class ProductExtension    {                //get iphone        public static IEnumerable
         
           GetIphone
          
           (this IEnumerable
           
             source, Func
            
              selector) { foreach (var t in source) { if (selector(t) != null) { yield return selector(t); } } } //get first public static Tsource getFirst
             
              (this IEnumerable
              
                ilist) { return ilist.First(); } }