c# Lambda運算式和運算式樹狀架構

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using System;using System.Collections.Generic;using System.Data.SqlClient;using System.Linq;using System.Text;using System.Threading.Tasks;namespace SRLJCSHAP.委託.Demo{    delegate void StringProcessor(string input);//聲明委託類型    public class Person    {        string name;        public Person(string Name)        {            this.name = Name;        }        //聲明相容的執行個體方法        public void Say(string Msg)        {            Console.WriteLine("{0} says: {1}", name, Msg);        }    }    public class Background    {        //聲明相容的靜態方法        public static void Note(string note)        {            Console.WriteLine("({0})", note);        }           }}

 

using System;using System.Collections.Generic;using System.ComponentModel;using System.Linq;using System.Linq.Expressions;using System.Text;using System.Windows.Forms;namespace SRLJCSHAP.Lambda運算式和運算式樹狀架構.Demo{    class Program    {        static void Main(string[] args)        {            Func<string, int> returnLength;            returnLength = text => text.Length;            Console.WriteLine(returnLength("Hello"));            #region 用Lambda運算式來處理一個電影列表            var films = new List<Film>            {                new Film{ name="龍在江湖", year=1999},                new Film{ name="暴力街區",year=2010},                new Film{ name="大話西遊",year=1998},                new Film{name="南京南京",year=1985},                new Film{name="The Wizard OF oz",year=1935},                new Film{name="apple",year=2014}            };            Action<Film> print =                film => Console.WriteLine("Name={0},year={1}", film.name, film.year);//建立可重用的列表列印委託            films.ForEach(print);//列印原始的列表            films.FindAll(f => f.year < 1990).ForEach(print);//建立篩選過的列表            films.Sort((f1, f2) => f1.name.CompareTo(f2.name));//排序原始列表            films.ForEach(print);            #endregion            #region 用Lambda運算式來記錄事件            Button btn = new Button { Text = "Click me" };            btn.Click += (src, e) => Log("Click", src, e);            btn.KeyPress += (src, e) => Log("KeyPress", src, e);            btn.MouseClick += (src, e) => Log("MouseClick", src,e);            Form frm = new Form { AutoSize = true, Controls = { btn } };            Application.Run(frm);            #endregion            #region 一個非常簡單的運算式樹狀架構            Expression first = Expression.Constant(2);            Expression second = Expression.Constant(3);            Expression add = Expression.Add(first, second);            Console.WriteLine(add);            #endregion            Console.ReadKey();        }        static void Log(string title, object sender, EventArgs e)        {            Console.WriteLine("Event:{0}", title);            Console.WriteLine("     Sender{0}", sender);            Console.WriteLine(" Arguments:{0} ", e.GetType());            foreach (PropertyDescriptor prop in TypeDescriptor.GetProperties(e))            {                string name = prop.DisplayName;                object value = prop.GetValue(e);                Console.WriteLine("{0}={1}", name, value);            }        }    }}

 

c# Lambda運算式和運算式樹狀架構