Object 循环遍历对象C的ArrayList#

我试图循环遍历类型为（人）的对象的数组列表，因此我创建了两个类：

Person.cs

using System;

namespace GenericTypes
{
    public class Person
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public int Age { get; set; }
        public DateTime DateTime { get; set; }

    }
}

using System;
using System.Collections;
using System.Collections.Generic;

namespace GenericTypes
{
    public class People
    {
        public ArrayList GetNonGenericPeople()
        {
            var people = new ArrayList()
            {
                new Person() {FirstName = "Djerah", LastName = "Ahmed Rafik", Age = 23, DateTime = DateTime.Today},
                new Person() {FirstName = "Djerah", LastName = "Amjed Amir", Age = 11, DateTime = DateTime.Today},
                new Person() {FirstName = "Gadda", LastName = "Anoir", Age = 25, DateTime = DateTime.Today}

            };
            return people;
        }

        public  List<Person> GetGenericPeople()
        {
            var people = new List<Person>()
            {
                new Person() {FirstName = "Djerah", LastName = "Ahmed Rafik", Age = 23, DateTime = DateTime.Today},
                new Person() {FirstName = "Djerah", LastName = "Amjed Amir", Age = 11, DateTime = DateTime.Today},
                new Person() {FirstName = "Gadda", LastName = "Anoir", Age = 25, DateTime = DateTime.Today}

            };

            return people;
        }
    }
}

namespace GenericTypes
{
    class Program
    {
        static void Main(string[] args)
        {
           var persons = new People();
            var p = persons.GetNonGenericPeople();

            foreach (var s in p)
            {
                Console.WriteLine(s);
            }
        }
    }
}

People.cs

using System;

namespace GenericTypes
{
    public class Person
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public int Age { get; set; }
        public DateTime DateTime { get; set; }

    }
}

using System;
using System.Collections;
using System.Collections.Generic;

namespace GenericTypes
{
    public class People
    {
        public ArrayList GetNonGenericPeople()
        {
            var people = new ArrayList()
            {
                new Person() {FirstName = "Djerah", LastName = "Ahmed Rafik", Age = 23, DateTime = DateTime.Today},
                new Person() {FirstName = "Djerah", LastName = "Amjed Amir", Age = 11, DateTime = DateTime.Today},
                new Person() {FirstName = "Gadda", LastName = "Anoir", Age = 25, DateTime = DateTime.Today}

            };
            return people;
        }

        public  List<Person> GetGenericPeople()
        {
            var people = new List<Person>()
            {
                new Person() {FirstName = "Djerah", LastName = "Ahmed Rafik", Age = 23, DateTime = DateTime.Today},
                new Person() {FirstName = "Djerah", LastName = "Amjed Amir", Age = 11, DateTime = DateTime.Today},
                new Person() {FirstName = "Gadda", LastName = "Anoir", Age = 25, DateTime = DateTime.Today}

            };

            return people;
        }
    }
}

namespace GenericTypes
{
    class Program
    {
        static void Main(string[] args)
        {
           var persons = new People();
            var p = persons.GetNonGenericPeople();

            foreach (var s in p)
            {
                Console.WriteLine(s);
            }
        }
    }
}

尝试

of type（）

Linq，它过滤掉

T

实例；另一个选项是

Cast（）

foreach（类型（）第页中的变量s）{
...
}
尝试
of type（）
Linq，它过滤掉
T
实例；另一个选项是
Cast（）

foreach（类型（）第页中的变量s）{
...
}
@D.AhmedRafik：不客气！但是请记住，
ArrayList
是过时的类，
List
是集合的更好选择。有一件事我没有弄明白，为什么我们需要将ArrayList强制转换为泛型列表，以便我们可以访问Person的属性
ArrayList
不实现
IEnumerable
，而只实现
IEnumerable
。
ArrayList
实例可能包含
string
、
object
、
Form
等项，因此我们要么通过
OfType（）
过滤掉
Person
项，要么通过
cast（）
转换项。艾哈迈德拉菲克：不客气！但是请记住，
ArrayList
是过时的类，
List
是集合的更好选择。有一件事我没有弄明白，为什么我们需要将ArrayList强制转换为泛型列表，以便我们可以访问Person的属性
ArrayList
不实现
IEnumerable
，而只实现
IEnumerable
。
ArrayList
实例可能包含
string
、
object
、
Form
等项，因此我们必须通过
OfType（）
过滤出
Person
项，或者通过
cast（）
转换项