diff --git a/C#核心/C#核心.sln b/C#核心/C#核心.sln
index e14b28e..9093761 100644
--- a/C#核心/C#核心.sln
+++ b/C#核心/C#核心.sln
@@ -9,8 +9,6 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson10_封装-运算符
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson10_封装-运算符重载", "Lesson10_封装-运算符重载联系\Lesson10_封装-运算符重载.csproj", "{DEE2177C-8552-488D-A36A-A47B8547580D}"
 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", "{DD7B30CE-773B-4752-9703-D0D5E6E4F376}"
-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}"
@@ -33,10 +31,6 @@ Global
 		{DEE2177C-8552-488D-A36A-A47B8547580D}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{DEE2177C-8552-488D-A36A-A47B8547580D}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{DEE2177C-8552-488D-A36A-A47B8547580D}.Release|Any CPU.Build.0 = Release|Any CPU
-		{DD7B30CE-773B-4752-9703-D0D5E6E4F376}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{DD7B30CE-773B-4752-9703-D0D5E6E4F376}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{DD7B30CE-773B-4752-9703-D0D5E6E4F376}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{DD7B30CE-773B-4752-9703-D0D5E6E4F376}.Release|Any CPU.Build.0 = Release|Any CPU
 		{97B96262-E4CC-4A7B-8545-D58984CCBD70}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{97B96262-E4CC-4A7B-8545-D58984CCBD70}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{97B96262-E4CC-4A7B-8545-D58984CCBD70}.Release|Any CPU.ActiveCfg = Release|Any CPU
diff --git a/C#核心/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 b/C#核心/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
deleted file mode 100644
index 2150e37..0000000
--- a/C#核心/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
+++ /dev/null
@@ -1,10 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
-    <ImplicitUsings>enable</ImplicitUsings>
-    <Nullable>enable</Nullable>
-  </PropertyGroup>
-
-</Project>
diff --git a/C#核心/Lesson12_继承_继承的基本概念练习/Program.cs b/C#核心/Lesson12_继承_继承的基本概念练习/Program.cs
deleted file mode 100644
index d72b5f5..0000000
--- a/C#核心/Lesson12_继承_继承的基本概念练习/Program.cs
+++ /dev/null
@@ -1,34 +0,0 @@
-namespace Lesson12_继承_继承的基本概念练习
-{
-    class Human
-    {
-        public string name;
-        public int age;
-        public void Speak()
-        {
-            Console.WriteLine("说话");
-        }
-    }
-    class Warrior : Human
-    {
-        public int atk;
-        public void Attack()
-        {
-            Console.WriteLine("攻击");
-        }
-    }
-    internal class Program
-    {
-        static void Main(string[] args)
-        {
-            Console.WriteLine("Hello, World!");
-            Warrior w = new Warrior();
-            w.name = "HK";
-            w.age = 18;
-            w.Speak();
-            w.atk = 5;
-            w.Attack();
-
-        }
-    }
-}