添加Lesson8

C#进阶/C#进阶.sln

@@ -33,6 +33,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson7_List", "Lesson7_Lis
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson7_List练习", "Lesson7_List练习\Lesson7_List练习.csproj", "{1E65491F-EA06-4E4D-9E20-A692C9EB3C79}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson8_Dictionary", "Lesson8_Dictionary\Lesson8_Dictionary.csproj", "{42A1E4A3-FE66-4E6A-B2C0-D383BDADD315}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson8_Dictionary练习", "Lesson8_Dictionary练习\Lesson8_Dictionary练习.csproj", "{1481414C-D336-4691-A45A-6A8CABFD33FE}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -99,6 +103,14 @@ Global
 		{1E65491F-EA06-4E4D-9E20-A692C9EB3C79}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{1E65491F-EA06-4E4D-9E20-A692C9EB3C79}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{1E65491F-EA06-4E4D-9E20-A692C9EB3C79}.Release|Any CPU.Build.0 = Release|Any CPU
+		{42A1E4A3-FE66-4E6A-B2C0-D383BDADD315}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{42A1E4A3-FE66-4E6A-B2C0-D383BDADD315}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{42A1E4A3-FE66-4E6A-B2C0-D383BDADD315}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{42A1E4A3-FE66-4E6A-B2C0-D383BDADD315}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1481414C-D336-4691-A45A-6A8CABFD33FE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1481414C-D336-4691-A45A-6A8CABFD33FE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1481414C-D336-4691-A45A-6A8CABFD33FE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1481414C-D336-4691-A45A-6A8CABFD33FE}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

C#进阶/Lesson6_Dictionary练习/Lesson6_Dictionary练习.csproj

@@ -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/Lesson6_Dictionary练习/Program.cs

@@ -0,0 +1,10 @@
+namespace Lesson6_Dictionary练习
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello, World!");
+        }
+    }
+}

C#进阶/Lesson8_Dictionary/Lesson8_Dictionary.csproj

@@ -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/Lesson8_Dictionary/Program.cs

@@ -0,0 +1,89 @@
+using System.Collections.Generic;
+namespace Lesson8_Dictionary
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            #region 知识点一 Dictionary本质
+            //可以将Dictionary理解为 拥有泛型的Hashtable
+            //他也是极于剑的哈希代码组织起来的 键/值对
+            //键值对类型从Hashtable的object变为了可以自己指定的泛型
+            #endregion
+
+            #region 知识点二 声明
+            Dictionary<int, string> dictionary = new Dictionary<int, string>();
+            #endregion
+
+            #region 知识点三 增删查改
+            #region 增
+            //注意：不能出现相同键
+            dictionary.Add(1, "111");
+            dictionary.Add(2, "222");
+            dictionary.Add(3, "333");
+            #endregion
+
+            #region 删
+            //1.只能通过键去删除
+            // 删除不存在的键 无反应
+            dictionary.Remove(1);
+            dictionary.Remove(4);
+            //2.清空
+            dictionary.Clear();
+            #endregion
+
+            #region 查
+            //1.通过键查看值
+            //注意：找不到直接报错，而不是像hashtable一样无反应
+            dictionary.Add(1, "111");
+            dictionary.Add(2, "222");
+            dictionary.Add(3, "333");
+            Console.WriteLine(dictionary[2]);//"222"
+            //Console.WriteLine(dictionary[4]);//不会像hashtable一样无反应而是直接报错
+            //2.查看是否存在
+            // 根据键检测
+            if (dictionary.ContainsKey(1) )
+            {
+                Console.WriteLine("存在键为1的键值对");
+            }
+            // 根据值检测
+            if (dictionary.ContainsValue("111"))
+            {
+                Console.WriteLine("存在值为111的键值对");
+            }
+            #endregion
+
+            #region 改
+            Console.WriteLine(dictionary[1]);
+            dictionary[1] = "999";
+            Console.WriteLine(dictionary[1]);
+            #endregion
+            #endregion
+
+            #region 知识点四 遍历啊
+            Console.WriteLine("---------------------------");
+            //长度
+            Console.WriteLine(dictionary.Count);
+            //1.遍历所有键
+            Console.WriteLine("---------------------------");
+            foreach (int item in dictionary.Keys)
+            {
+                Console.WriteLine(item);
+                Console.WriteLine(dictionary[item]);
+            }
+            //2.遍历所有值
+            Console.WriteLine("---------------------------");
+            foreach (string item in dictionary.Values)
+            {
+                Console.WriteLine(item);
+            }
+            //3.键值对一起遍历
+            Console.WriteLine("---------------------------");
+            foreach (KeyValuePair<int, string> pair in dictionary)
+            {
+                Console.WriteLine($"键：{pair.Key}  值:{pair.Value}");
+            }
+            #endregion
+        }
+    }
+}

C#进阶/Lesson8_Dictionary练习/Lesson8_Dictionary练习.csproj

@@ -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/Lesson8_Dictionary练习/Program.cs

@@ -0,0 +1,99 @@
+namespace Lesson8_Dictionary练习
+{
+    class Num
+    {
+        public static Dictionary<int, string> num = new Dictionary<int, string>();
+
+        // 使用静态构造函数初始化字典
+        static Num()
+        {
+            num.Add(1, "壹");
+            num.Add(2, "贰");
+            num.Add(3, "叁");
+            num.Add(4, "肆");
+            num.Add(5, "伍");
+            num.Add(6, "陆");
+            num.Add(7, "柒");
+            num.Add(8, "捌");
+            num.Add(9, "玖");
+            num.Add(0, "零");
+        }
+
+        public static void RerunNum(int number)
+        {
+            if (number > 999 || number < 0)
+            {
+                Console.WriteLine("越界");
+                return;
+            }
+
+            if (number == 0)
+            {
+                Console.WriteLine("零");
+                return;
+            }
+
+            string result = "";
+
+            // 处理百位
+            int hundreds = number / 100;
+            if (hundreds > 0)
+            {
+                result += num[hundreds] + "佰";
+            }
+
+            // 处理十位
+            int tens = (number % 100) / 10;
+            if (tens > 0)
+            {
+                result += num[tens] + "拾";
+            }
+            else if (hundreds > 0 && number % 100 > 0)
+            {
+                // 百位不为0，十位为0，个位不为0时加"零"
+                result += "零";
+            }
+
+            // 处理个位
+            int ones = number % 10;
+            if (ones > 0)
+            {
+                result += num[ones];
+            }
+
+            Console.WriteLine(result);
+        }
+    }
+
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("请输入一个数");
+            Num.RerunNum(int.Parse(Console.ReadLine()));
+
+
+
+
+            Dictionary<char, int> dic = new Dictionary<char, int>();
+            string str = "Welcome to Unity World!";
+            str = str.ToLower();
+            for (int i = 0; i < str.Length; i++)
+            {
+                if (dic.ContainsKey(str[i]))
+                {
+                    dic[str[i]] += 1;
+                }
+                else
+                {
+                    dic.Add(str[i], 1);
+                }
+            }
+            foreach (var item in dic)
+            {
+                Console.WriteLine($"{item.Key}字母出现了{item.Value}次");
+            }
+        }
+
+    }
+}