昨天有个网友问我继承里面的new和override关键词有啥区别，呃，我们来看个例子就知道了
new ==》隐藏父类同名方法 override==》覆盖
定义一个父类：
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public
class
People
{
/// <summary>
///ushort参考： https://msdn.microsoft.com/zh-CN/library/cbf1574z.aspx
/// </summary>
public
string
Name {
get
;
set
; }
public
ushort
Age {
get
;
set
; }
public
People(
string
name,
ushort
age)
{
this
.Name = name;
this
.Age = age;
}
public
void
Hi()
//People
{
Console.WriteLine(
"Name: "
+
this
.Name +
" Age: "
+
this
.Age);
}
public
virtual
void
Show()
//People
{
Console.WriteLine(
"Name: "
+
this
.Name +
" Age: "
+
this
.Age);
}
}
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定义一个子类:
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public
class
Student : People
{
#region 属性
/// <summary>
/// 学校
/// </summary>
public
string
School {
get
;
set
; }
/// <summary>
/// 班级
/// </summary>
public
string
StrClass {
get
;
set
; }
/// <summary>
/// 学号
/// </summary>
public
string
StrNum {
get
;
set
; }
#endregion
#region 构造函数
/// <summary>
/// 调用父类构造函数
/// </summary>
/// <param name="name"></param>
/// <param name="age"></param>
public
Student(
string
name,
ushort
age) :
base
(name, age)
{
}
public
Student(
string
name,
ushort
age,
string
school,
string
strClass,
string
strNum) :
this
(name, age)
{
this
.School = school;
this
.StrClass = strClass;
this
.StrNum = strNum;
}
#endregion
/// <summary>
/// new-隐藏
/// </summary>
public
new
void
Hi()
//Student
{
Console.WriteLine(
"Name: "
+
this
.Name +
" Age: "
+
this
.Age +
" School: "
+
this
.School +
" strClass: "
+
this
.StrClass +
" strNum: "
+
this
.StrNum);
}
/// <summary>
/// override-覆盖
/// </summary>
public
override
void
Show()
//Student
{
Console.WriteLine(
"Name: "
+
this
.Name +
" Age: "
+
this
.Age +
" School: "
+
this
.School +
" strClass: "
+
this
.StrClass +
" strNum: "
+
this
.StrNum);
}
}
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调用一下
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static
void
Main(
string
[] args)
{
People p =
new
Student(
"app"
, 10,
"北京大学"
,
"001"
,
"01001"
);
p.Hi(); p.Show();
System.Console.WriteLine();
Student s = p
as
Student;
s.Hi(); s.Show();
System.Console.ReadKey();
}
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输出：
可以发现，用new修饰的方法，其父方法并没有被改变，只是被隐藏了
用override重写的方法却被覆盖，从而改变了（多态）
本文转自毒逆天博客园博客，原文链接：http://www.cnblogs.com/dunitian/p/5206954.html，如需转载请自行联系原作者
