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 int[] Array ={1,2,3,34,454,101 };
            var item = from a in Array
                       where a > 100
                       select a;
            foreach(var a in item)
            {
                Console.WriteLine(a);
            }

var Account = new {AccountName="abc",AccountPwd="123" };//匿名類型
C#3.0特性：匿名類型，隱式類型化變量，自動(dòng)實(shí)現(xiàn)的屬性：{get;set;},{get;private set;}//注:后面的為只讀
對(duì)象和集合初始化器：Users user=new Users{屬性=值，屬性=值...}//著重初始化屬性
擴(kuò)展方法：必須是靜態(tài)的，Linq，lambda表達(dá)式和表達(dá)式樹
匿名對(duì)象著重初始化對(duì)象不要名字與匿名類型不同，new ~().屬性
var關(guān)鍵字編譯后為強(qiáng)類型，為后期綁定
public int UserAge {get;set;}//自動(dòng)實(shí)現(xiàn)的屬性
Take相當(dāng)于top,skip跳過多少行記錄
//擴(kuò)展方法
public class Users
    {
        public string UserName { get; set; }
        public int UserAge { get;  set; }
        //public string Mobile { get; set; }
        //public
    }
   public static class Program
    {
        static void Main1(string[] args)
        {
            Users user = new Users{ UserName = "sdfg",UserAge=52 };
            user.ShowInfo();
           // List<int> list = new List<int>{34,23,12,1,6,56 };
            //var temp = "asdfa";
            //var temp2 = 123;
            //var temp3 = temp + temp2.ToString();
            var Account = new { AccountName="abc",AccountPwd="cde" };

        }
        public static void ShowInfo(this Users user)
        {
            Console.WriteLine(user.UserName+"  " + user.UserAge);
        }

//用new{}
List<Users> user = new List<Users>{
                new Users{UserName="aaa",UserAge=22,Mobile="13567845678"},
                 new Users{ UserName="efg",  Mobile="120", UserAge=53 },
                new Users{ UserName="wer", UserAge=34,  Mobile="139"}
                              };

            var query = from userItem in user
                        where userItem.UserAge > 18
                        select new { userItem.UserName, userItem.UserAge };

            foreach (var item in query)
            {
                Console.WriteLine(item.UserName + ":" + item.UserAge);
            }

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