废话不多说，直接贴代码：

MyCustomerList.cs

public class MyCustomerList
     
       : IEnumerable
      
           {        private class Node        {            public Node(T data)            {                _data = data;                _next = null;            }            private T _data;            public T Data            {                get                {                    return _data;                }                set                {                    _data = value;                }            }            private Node _next;            public Node Next            {                get                {                    return _next;                }                set                {                    _next = value;                }            }        }        private Node _head;        public MyCustomerList()        {            _head = null;        }        /// 
       
        /// 添加到集合的头部        /// 
        /// 
               public void AddToHead(T data)        {            Node current = new Node(data);            current.Next = _head;            _head = current;        }        /// 
       
        /// 添加到集合的尾部        /// 
        /// 
               public void AddToLast(T data)        {            Node current = new Node(data);            Node last = GetLastNode();            if (last == null)            {                //集合中目前还没有元素                _head = new Node(data);            }            else            {                last.Next = current;            }                    }        private Node GetLastNode()        {            Node last = _head;            while(last != null && last.Next != null)            {                last = last.Next;            }            return last;        }        public IEnumerator
       
         GetEnumerator()        {            Node current = _head;            while(current != null)            {                yield return current.Data;                current = current.Next;            }        }        IEnumerator IEnumerable.GetEnumerator()        {            return GetEnumerator();        }    }
       
      
     

 

Program.cs

public class Program    {        static void Main(string[] args)        {            MyCustomerList
     
       myList = new MyCustomerList
      
       ();            myList.AddToLast(10);            myList.AddToLast(20);            myList.AddToLast(30);            myList.AddToLast(40);            Show(myList);            myList.AddToHead(5);            myList.AddToHead(3);            Show(myList);            MyCustomerList
       
         teachers = new MyCustomerList
        
         ();            teachers.AddToLast(new Teacher() { Name = "张三", Age = 26, Birthday = new DateTime(1985,8,7) });            teachers.AddToLast(null);            teachers.AddToLast(new Teacher() { Name = "李四", Age = 27, Birthday = new DateTime(1984, 8, 7) });            teachers.AddToLast(new Teacher());            Show(teachers);            Console.ReadLine();        }        static void Show
         
          (MyCustomerList
          
            myList) { Console.WriteLine("\n准备遍历集合中的内容："); foreach (var item in myList) { Console.WriteLine(item); } Console.WriteLine("遍历结束\n"); } } public class Teacher { public Teacher() { } public Teacher(string name, int age, DateTime birthday) { this.Name = name; this.Age = age; this.Birthday = birthday; } public string Name { get; set; } public int Age { get; set; } public DateTime Birthday { get; set; } public override string ToString() { return string.Format("大家好，我叫 {0}, 今年 {1} 岁，出生日期：{2}",Name,Age,Birthday); } }
          
         
        
       
      
     

 

运行截图：

谢谢浏览！