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ExM.Inheritance/ExM.Inheritance.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExM.Inheritance/Program.cs

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+// 베이스 클래스
+public class Animal
+{
+    public string Name { get; set; }
+    public int Age { get; set; }
+}
+
+// 파생클래스
+public class Dog : Animal
+{
+    public void HowOld()
+    {
+        // 베이스 클래스의 Age 속성 사용
+        Console.WriteLine("나이: {0}", this.Age);
+    }
+}
+
+public class Bird : Animal
+{
+    public void Fly()
+    {
+        Console.WriteLine("{0}가 날다", this.Name);
+    }
+}
+
+
+public class VirBase
+{
+    public virtual void Say()
+    {
+        Console.WriteLine("Hello");
+    }
+}
+
+public class SpeakerA : VirBase
+{
+    public override void Say()
+    {
+        Console.WriteLine("World");
+    }
+}
+
+public abstract class PureBase
+{
+    // abstract C#키워드 
+    public abstract int GetFirst();
+    public abstract int GetNext();
+}
+
+public class DerivedA : PureBase
+{
+    private int no = 1;
+
+    // override C#키워드 
+    public override int GetFirst()
+    {
+        return no;
+    }
+
+    public override int GetNext()
+    {
+        return ++no;
+    }
+}
+
+public class MyBase
+{
+    public string Name { get; set; }
+    protected int Age { get; set; }
+}
+
+public class MyDerived : MyBase
+{
+    public void Run()
+    {
+        // 파생클래스이므로 Age 사용 가능
+        Console.WriteLine("나이: {0}", this.Age);
+    }
+}
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        var dog = new Dog();
+        dog.Name = "멍멍이";
+        dog.Age = 10;
+        var bird = new Bird();
+        bird.Name = "삐약이";
+
+        dog.HowOld();
+        bird.Fly();
+
+        Animal[] animals = { dog, bird };
+        foreach (var animal in animals)
+        {
+            Console.WriteLine($"{animal.Name}");
+        }
+
+    }
+    public void Test(object obj)
+    {
+        // as 연산자
+        MyBase a = obj as MyBase;
+
+        // is 연산자
+        bool ok = obj is MyBase; //true
+
+        // Explicit Casting
+        MyBase b = (MyBase)obj;
+    }
+
+}