C#核心语法-泛型（详细讲解泛型方法、泛型类、泛…

using System;
using System.Collections.Generic;
 
public class MyList<T> //type parameter T in angle brackets
    {
        private Node head;
　　　　 // The nested type is also generic on T.
        private class Node          
        {
            private Node next;
//T as private member data type:
            private T data;         
//T used in non-generic constructor:
            public Node(T t)        
            {
                next = null;
                data = t;
            }
            public Node Next
            {
                get { return next; }
                set { next = value; }
            }
//T as return type of property:
            public T Data           
            {
                get { return data; }
                set { data = value; }
            }
        }
        public MyList()
        {
            head = null;
        }
//T as method parameter type:
        public void AddHead(T t)    
        {
            Node n = new Node(t);
            n.Next = head;
            head = n;
        }
 
        public IEnumerator<T> GetEnumerator()
        {
            Node current = head;
 
            while (current != null)
            {
                yield return current.Data;
                current = current.Next;
            }
        }
    }

class Program
    {
        static void Main(string[] args)
        {
//int is the type argument.
           MyList<int> list = new MyList<int>();
            for (int x = 0; x < 10; x++)
                list.AddHead(x);
 
            foreach (int i in list)
            {
                Console.WriteLine(i);
            }
            Console.WriteLine("Done");
        }
    }

//The .NET Framework 1.1 way of creating a list
ArrayList list1 = new ArrayList(); 
list1.Add(3);
list1.Add(105);
//...
ArrayList list2 = new ArrayList();
list2.Add(“It is raining in Redmond.”);
list2.Add("It is snowing in the mountains.");
//...

ArrayList list = new ArrayList(); 
//Okay.  
list.Add(3); 
//Okay, but did you really want to do this?
list.Add(.“It is raining in Redmond.”);
 
int t = 0;
//This causes an InvalidCastException to be returned.
    foreach(int x in list)
{
  t += x;
}

List<int> list1 = new List<int>();
//No boxing, no casting:
list1.Add(3);
//Compile-time error:
list1.Add("It is raining in Redmond.");

MyList<MyClass> list1  = new MyList<MyClass>();
MyList<float> list2 = new MyList<float>();
MyList<SomeStruct> list3 = new MyList<SomeStruct>();