1 public class Program: BaseClass
 2     {
 3         new public class Test//2、new修饰符 显式隐藏从基类继承的成员
 4         {
 5             public int x = 2;
 6             public int y = 20;
 7             public int z = 40;
 8         }
 9 
10         static void Main(string[] args)
11         {
12             var c1 = new Test();//1、new操作符 创建对象和调用构造函数
13             var c2 = new BaseClass.Test();
14             Console.WriteLine(c1.x);//2
15             Console.WriteLine(c2.y);//10
16             Console.ReadKey();
17         }
18     }
19 
20     public class BaseClass
21     {
22         public class Test
23         {
24            public int x = 0;
25            public int y = 10;
26         }
27     }

 1 using System;
 2 using System.Collections.Generic;
 3 
 4 namespace ConsoleApplication2
 5 {
 6     public class Employee
 7     {
 8         private string name;
 9         private int id;
10 
11         public Employee()
12         {
13             name = "Temp";
14             id = 0;
15         }
16 
17         public Employee(string s, int i)
18         {
19             name = s;
20             id = i;
21         }
22 
23         public string Name
24         {
25             get { return name; }
26             set { name = value; }
27         }
28 
29         public int ID
30         {
31             get { return id; }
32             set { id = value; }
33         }
34     }
35 
36     class ItemFactory<T> where T : new()
37     {
38         public T GetNewItem()
39         {
40             return new T();
41         }
42     }
43 
44     public class Test
45     {
46         public static void Main()
47         {
48             ItemFactory<Employee> EmployeeFactory = new ItemFactory<Employee>();
49             ////此处编译器会检查Employee是否具有公有的无参构造函数。
50             //若没有则会有The Employee must have a public parameterless constructor 错误。
51             Console.WriteLine("{0}'ID is {1}.", EmployeeFactory.GetNewItem().Name, EmployeeFactory.GetNewItem().ID);
52         }
53     }
54 }