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修改Lesson13名称

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添加Lesson13练习
This commit is contained in:
Kister Hakusan
2025-09-09 15:40:24 +08:00
parent 307b255d02
commit 4a47573851
6 changed files with 280 additions and 1 deletions
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C#核心/C#核心.sln
+7 -1
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@@ -11,12 +11,14 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson10_封装-运算符
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson11_封装-内部类与外部类", "Lesson11_封装-内部类与外部类\Lesson11_封装-内部类与外部类.csproj", "{97B96262-E4CC-4A7B-8545-D58984CCBD70}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson13_继承-李氏替换原则", "Lesson13_继承-李氏替换原则\Lesson13_继承-李氏替换原则.csproj", "{06C184C2-C60B-4CFC-B3B8-7A8E0754D725}"
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson13_继承-里氏替换原则", "Lesson13_继承-李氏替换原则\Lesson13_继承-里氏替换原则.csproj", "{06C184C2-C60B-4CFC-B3B8-7A8E0754D725}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson12_继承-继承的基本概念练习", "Lesson12_继承-继承的基本概念练习\Lesson12_继承-继承的基本概念练习.csproj", "{B432065F-FFA2-4866-BC75-8AC33869B92F}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson12_继承-继承的基本概念", "Lesson12_继承-继承的基本概念\Lesson12_继承-继承的基本概念.csproj", "{45F37FBC-59A8-4FC9-B0F5-5CEA222D8C7E}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson13_继承-里氏替换原则练习", "Lesson13_继承-里氏替换原则练习\Lesson13_继承-里氏替换原则练习.csproj", "{B17DEE02-D1AD-460B-8295-DDDE32A0EDA7}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@@ -51,6 +53,10 @@ Global
{45F37FBC-59A8-4FC9-B0F5-5CEA222D8C7E}.Debug|Any CPU.Build.0 = Debug|Any CPU
{45F37FBC-59A8-4FC9-B0F5-5CEA222D8C7E}.Release|Any CPU.ActiveCfg = Release|Any CPU
{45F37FBC-59A8-4FC9-B0F5-5CEA222D8C7E}.Release|Any CPU.Build.0 = Release|Any CPU
{B17DEE02-D1AD-460B-8295-DDDE32A0EDA7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{B17DEE02-D1AD-460B-8295-DDDE32A0EDA7}.Debug|Any CPU.Build.0 = Debug|Any CPU
{B17DEE02-D1AD-460B-8295-DDDE32A0EDA7}.Release|Any CPU.ActiveCfg = Release|Any CPU
{B17DEE02-D1AD-460B-8295-DDDE32A0EDA7}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
C#核心/Lesson13_继承-李氏替换原则/Lesson13_继承-李氏替换原则.csproj → C#核心/Lesson13_继承-李氏替换原则/Lesson13_继承-里氏替换原则.csproj
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C#核心/Lesson13_继承-李氏替换原则/Program.cs
+105
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@@ -1,10 +1,115 @@
namespace Lesson13_继承_李氏替换原则
{
#region 知识点一 基本概念
//里氏替换原则是面向对象七大原则中最重要的原则
//概念：
//任何父类出现的地方，子类都可以替代
//重点：
//语法表现——父类容器装子类对象，因为子类对象包含了父类的所有内容
//作用：
//方便进行对象存储和管理
#endregion
#region 知识点二 基本实现
class GameObject
{
}
class Player:GameObject
{
public void PlayerAtk()
{
Console.WriteLine("玩家攻击");
}
}
class Monster :GameObject
{
public void MonsterAtk()
{
Console.WriteLine("怪物攻击");
}
}
class Boss:GameObject
{
public void BossAtk()
{
Console.WriteLine("Boss攻击");
}
}
#endregion
internal class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello, World!");
//里氏替换原则
GameObject player = new Player();
GameObject monster = new Monster();
GameObject boss = new Boss();
GameObject[] objects = new GameObject[] { player, monster, boss };
//player.atk();//容器是gameobject,没有atk这个方法
#region 知识点三 is和as
//基本概念
//is：判断一个对象是否执行类对象
//返回时：bool 是为真 不是为假
if (player is Player)
{
}else if (player is Monster)
{
}
//as：将一个对象转换为指定类对象
//返回值：指定类型对象
//成功返回指定类型对象，失败返回null
Player test = player as Player;//将player转换为Player类型对象（可）返回player类型对象(Player 类型的 test，存放player)
Player test2 = monster as Player;//将monster转换为Player类型对象（报错）返回空(Player 类型的 test2, 存放的是空)
//基本语法
// 类对象 is 类名 该语句块 会有一个bool返回值 true和false
// 类对象 as 类名 该语句块 会有一个对象返回值 对象和null
// 一般组合使用
if(player is Player)
{
//常规写法
//Player p1 = player as Player;
//p1.PlayerAtk();
//一句话写法
(player as Player).PlayerAtk();
}
//同时声明多个子类对象，并集中按需使用 ->GameObject[] objects = new GameObject[] { player, monster, boss };
for (int i = 0; i < objects.Length; i++)
{
if (objects[i] is Player)
{
//调用Player需要的逻辑
//eg:
(objects[i] as Player).PlayerAtk();
}
else if (objects[i] is Monster)
{
//调用Monster需要的逻辑
//eg:
(objects[i] as Monster).MonsterAtk();
}
else if (objects[i] is Boss)
{
//调用Boss需要的逻辑
//eg:
(objects[i] as Boss).BossAtk();
}
}
#endregion
}
}
}
C#核心/Lesson13_继承-里氏替换原则练习/Lesson13_继承-里氏替换原则练习.csproj
+11
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@@ -0,0 +1,11 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<RootNamespace>Lesson13_继承_里氏替换原则练习</RootNamespace>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>
C#核心/Lesson13_继承-里氏替换原则练习/Program.cs
+134
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@@ -0,0 +1,134 @@
namespace Lesson13_继承_里氏替换原则练习
{
class Monster
{
}
class Boss : Monster
{
public void Skill()
{
Console.WriteLine("Boss释放了技能");
}
}
class Goblin : Monster
{
public void Atk()
{
Console.WriteLine("小怪释放了攻击");
}
}
class Weapon
{
}
class SMG : Weapon
{
public void Shot()
{
Console.WriteLine("SMG shot");
}
}
class Shotgun : Weapon
{
public void Shot()
{
Console.WriteLine("Shotgun shot");
}
}
class Pistol : Weapon
{
public void Shot()
{
Console.WriteLine("Pistol shot");
}
}
class Knife : Weapon
{
public void Attack()
{
Console.WriteLine("Knife Attack");
}
}
class Player
{
private Weapon nowWeapon;
public Player()
{
nowWeapon = new Knife();
}
public void PickUp(Weapon newWeapon)
{
nowWeapon = newWeapon;
}
public void Attack()
{
if (nowWeapon == null)
{
Console.WriteLine("你没有武器");
}else if (nowWeapon is Knife)
{
(nowWeapon as Knife).Attack();
}else if(nowWeapon is Pistol)
{
(nowWeapon as Pistol).Shot();
}
else if (nowWeapon is Shotgun)
{
(nowWeapon as Shotgun).Shot();
}
else if (nowWeapon is SMG)
{
(nowWeapon as SMG).Shot();
}
else
{
Console.WriteLine("ERROR");
}
}
}
internal class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello, World!");
Random r = new Random();
Monster[] m = new Monster[10];
for (int i = 0; i < m.Length; i++)
{
if (r.Next(1, 101) < 50)
{
m[i] = new Boss();
}
else
{
m[i] = new Goblin();
}
}
for (int i = 0;i < m.Length;i++)
{
if (m[i] is Boss)
{
(m[i] as Boss).Skill();
}else if (m[i] is Goblin)
{
(m[i] as Goblin).Atk();
}
else
{
Console.WriteLine("Error");
}
}
Console.WriteLine();
Player p1 = new Player();
p1.Attack();
SMG smg1 = new SMG();
p1.PickUp(smg1);
p1.Attack();
}
}
}
C#核心/test/Program.cs
+23
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@@ -1,2 +1,25 @@
// See https://aka.ms/new-console-template for more information
Console.WriteLine("Hello, World!");
#region 知识点一
#endregion
#region 知识点二
#endregion
#region 知识点三
#endregion
#region 知识点四
#endregion
#region 知识点五
#endregion
#region 知识点六
#endregion
#region 知识点七
#endregion
#region 知识点八
#endregion