C# 3.0 新功能

 

 

 

C# 3.0 新功能

 

隐式类型的本地变量和数组

对象初始化设定项

集合初始化设定项

自动实现的属性

匿名类型

 

 

一:隐式类型的本地变量和数组

 

 

交错数组:每个元素都是由数组组成.

 

 

 

   var a = 5;

   var s = "Hello";

   //匿名类型
    var anon = new {Name="Ben",Age=26 };

 

 

 

  string[] words = {"aPPLE","BIUeBeRry","cHerry" };

            var upperLowerWords = from w in words
                                  select 
                                  new { Upper = w.ToUpper(), Lower = w.ToLower() };//匿名类型

            foreach (var ul in upperLowerWords)
            {
                Response.Write(String.Format("Uppercase:{0},Lowercase:{1}",ul.Upper,ul.Lower)+"<br/>");
            }

 

 

 

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication1
{
    public partial class WebForm3 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            List<Person> people = new List<Person>
            {
                new Person{FirstName="Scott",LastName="LEE",Age=32},
                new Person{FirstName="Susanne",LastName="LEE",Age=32},
                new Person{FirstName="Bill",LastName="Gates",Age=50}
            };

            var results = people.Where(p=>p.LastName=="LEE");

            foreach (var item in results)
            {
                Response.Write(item.FirstName+","+item.LastName+","+item.Age+"<br/>");
            }

        }
    }

    public class Person
    {
        private string firstName;

        public string FirstName
        {
            get { return firstName; }
            set { firstName = value; }
        }
        private string lastName;

        public string LastName
        {
            get { return lastName; }
            set { lastName = value; }
        }

        private int age;

        public int Age
        {
            get { return age; }
            set { age = value; }
        }

    }
}