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添加Lesson4

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This commit is contained in:
Kister Hakusan
2025-10-11 19:30:38 +08:00
parent 6c30ef5c27
commit 6cc1b0d4f9
5 changed files with 211 additions and 0 deletions
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C#进阶/C#进阶.sln
+12
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@@ -17,6 +17,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson3_Queue", "Lesson3_Qu
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson3_Queue练习题", "Lesson3_Queue练习题\Lesson3_Queue练习题.csproj", "{77AE0EA5-FD54-46A0-A708-A2B38ABEE26D}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson4_Hashtable", "Lesson4_Hashtable\Lesson4_Hashtable.csproj", "{C703B2F8-529B-46E0-8D8E-07750A812966}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson4_Hashtable练习题", "Lesson4_Hashtable练习题\Lesson4_Hashtable练习题.csproj", "{962C9536-7CD7-4F5A-9D1E-1DCF986953D4}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@@ -51,6 +55,14 @@ Global
{77AE0EA5-FD54-46A0-A708-A2B38ABEE26D}.Debug|Any CPU.Build.0 = Debug|Any CPU
{77AE0EA5-FD54-46A0-A708-A2B38ABEE26D}.Release|Any CPU.ActiveCfg = Release|Any CPU
{77AE0EA5-FD54-46A0-A708-A2B38ABEE26D}.Release|Any CPU.Build.0 = Release|Any CPU
{C703B2F8-529B-46E0-8D8E-07750A812966}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{C703B2F8-529B-46E0-8D8E-07750A812966}.Debug|Any CPU.Build.0 = Debug|Any CPU
{C703B2F8-529B-46E0-8D8E-07750A812966}.Release|Any CPU.ActiveCfg = Release|Any CPU
{C703B2F8-529B-46E0-8D8E-07750A812966}.Release|Any CPU.Build.0 = Release|Any CPU
{962C9536-7CD7-4F5A-9D1E-1DCF986953D4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{962C9536-7CD7-4F5A-9D1E-1DCF986953D4}.Debug|Any CPU.Build.0 = Debug|Any CPU
{962C9536-7CD7-4F5A-9D1E-1DCF986953D4}.Release|Any CPU.ActiveCfg = Release|Any CPU
{962C9536-7CD7-4F5A-9D1E-1DCF986953D4}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
C#进阶/Lesson4_Hashtable/Lesson4_Hashtable.csproj
+10
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@@ -0,0 +1,10 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>
C#进阶/Lesson4_Hashtable/Program.cs
+109
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@@ -0,0 +1,109 @@
using System.Collections;
namespace Lesson4_Hashtable
{
internal class Program
{
static void Main(string[] args)
{
#region 知识点一 Hashtable的本质
//Hashtable（又称散列表）是基于键的哈希代码组织起来的键/值对的集合。
//它的主要作用是提高数据查询的效率
//使用键来快速查找对应的值，而不需要遍历整个集合。
#endregion
#region 知识点二 声明
//需要引用system.collections命名空间
Hashtable hashtable = new Hashtable();
#endregion
#region 知识点三 增删查改
//只能通过键来操作值
//增
hashtable.Add("001", "张三");
// ↑键 ↑值
hashtable.Add("002", "李四");
hashtable.Add(true, false);
hashtable.Add(false, false);
//注意：不能出现相同的键
//删
//1.只能通过键来删除
hashtable.Remove("001");
//2.删除不存在的键不会报错也不会有任何反应
hashtable.Remove("003");
//3.清空
hashtable.Clear();
hashtable.Add(1, "张三");
hashtable.Add(2, "李四");
hashtable.Add(3, false);
hashtable.Add(true, false);
//查
//1.通过键来查找值，找不到返回null
Console.WriteLine(hashtable[1]);//找键值为1的值
Console.WriteLine(hashtable[4]);//不存在，返回null
Console.WriteLine(hashtable[true]);//找键值为true的值
//2.查看是否存在
//根据键检测
if(hashtable.ContainsKey(2))
{
Console.WriteLine("存在键为2的元素");
}
if(hashtable.ContainsKey(4))
{
Console.WriteLine("存在键为4的元素");
}
//根据值检测
if(hashtable.ContainsValue("李四"))
{
Console.WriteLine("存在值为李四的元素");
}
//改
hashtable[1] = "王五";//修改键为1的值
#endregion
#region 知识点四 遍历
//1.对数
Console.WriteLine(hashtable.Count);
//2.遍历所有键
foreach (object item in hashtable.Keys)
{
Console.WriteLine("键"+item);
Console.WriteLine("值"+hashtable[item]);
}
//3.遍历所有值
foreach (object item in hashtable.Values)
{
Console.WriteLine("值"+item);
}
//3.键值对一起遍历
foreach (DictionaryEntry item in hashtable)
{
Console.WriteLine("键值"+item.Key+item.Value);
}
//4.迭代器遍历法
IDictionaryEnumerator myEnumerator = hashtable.GetEnumerator();
bool flag = myEnumerator.MoveNext();
while (flag)
{
Console.WriteLine("键值" + myEnumerator.Key + myEnumerator.Value);
flag = myEnumerator.MoveNext();
}
#endregion
#region 知识点五 装箱拆箱
//一样的
#endregion
}
}
}
C#进阶/Lesson4_Hashtable练习题/Lesson4_Hashtable练习题.csproj
+10
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@@ -0,0 +1,10 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>
C#进阶/Lesson4_Hashtable练习题/Program.cs
+70
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@@ -0,0 +1,70 @@
using System;
using System.Collections;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
namespace Lesson4_Hashtable练习题
{
//因为一般管理器都是唯一的，所以做成单例模式的对象
class MonsterMgr
{
private static MonsterMgr instance = new MonsterMgr();
private Hashtable monstersTable = new Hashtable();
private MonsterMgr()
{
}
public static MonsterMgr Instance
{
get
{
return instance;
}
}
private int monsterID = 0;
public void AddMonster()
{
Monster monster = new Monster(monsterID);
Console.WriteLine("创建了怪物"+monsterID);
monsterID++;
monstersTable.Add(monster.id, monster);
}
public void DeleteMonster(int monsterID)
{
if (monstersTable.ContainsKey(monsterID))
{
(monstersTable[monsterID] as Monster).Dead();
monstersTable.Remove(monsterID);
}
}
}
class Monster
{
public int id;
public Monster(int id)
{
this.id = id;
}
public void Dead()
{
Console.WriteLine("怪物"+id+"死亡");
}
}
class Program
{
static void Main(string[] args)
{
MonsterMgr.Instance.AddMonster();
MonsterMgr.Instance.AddMonster();
MonsterMgr.Instance.AddMonster();
MonsterMgr.Instance.AddMonster();
MonsterMgr.Instance.AddMonster();
MonsterMgr.Instance.DeleteMonster(0);
MonsterMgr.Instance.DeleteMonster(3);
}
}
}