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85 lines
5.2 KiB
Markdown
85 lines
5.2 KiB
Markdown
---
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id: csharp-interface
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title: "C# Interface"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["interface implements C#", "IAnimal", "C# 인터페이스"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.85
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["csharp", "programming-language", "w3schools", "oop", "interface"]
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raw_sources: ["https://www.w3schools.com/cs/cs_interface.php"]
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applied_in: []
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github_commit: ""
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---
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# [[CSharp Interface]]
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## 🎯 한 줄 통찰 (One-line insight)
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The tutorial states outright why interfaces exist at all: "C# does not support 'multiple inheritance' (a class can only inherit from ONE base class)" — a hard restriction with NO equivalent in Topic_CPP, where C++ freely supports true multiple class inheritance (`class Derived : public Base1, public Base2`, already documented in `[[CPP Inheritance Multiple]]`) — so C# compensates by letting a class implement MANY interfaces via the SAME `:` syntax used for single-class inheritance, making interfaces less a stylistic alternative to abstract classes and more a structural workaround for a capability C# deliberately doesn't offer at the class level. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Interface** — a "completely abstract class" containing ONLY abstract methods and properties with empty bodies; no fields/variables allowed. [S1]
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- **Naming convention** — interfaces are conventionally prefixed with `I` (e.g. `IAnimal`) to distinguish them from ordinary classes at a glance. [S1]
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- **Default member modifiers** — interface members are implicitly `abstract` AND `public`, with no need to write those keywords. [S1]
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- **Implementation via `:`** — the SAME symbol used for inheritance; a class "implements" an interface using `:`, and must provide bodies for ALL the interface's methods. [S1]
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- **No `override` keyword needed** — unlike overriding a `virtual` base method, implementing an interface method requires no `override` keyword at all. [S1]
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- **Cannot instantiate an interface directly** — like an abstract class, an interface can never be `new`'d into an object. [S1]
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- **No constructors** — an interface cannot have a constructor, since it can never be instantiated. [S1]
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- **Motivation #2, stated explicitly** — because C# disallows multiple class inheritance, interfaces are the mechanism for achieving multiple-inheritance-like behavior (a class implementing several interfaces). [S1]
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## 📖 세부 내용 (Details)
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- Interface declaration: `interface Animal { void animalSound(); void run(); }` — both methods bodyless. [S1]
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- Implementation: `interface IAnimal { void animalSound(); } class Pig : IAnimal { public void animalSound() { Console.WriteLine("The pig says: wee wee"); } } ... Pig myPig = new Pig(); myPig.animalSound();`. [S1]
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- Explicit note that `IAnimal myObj = new IAnimal();` would be impossible, mirroring the abstract class restriction. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **다중 상속 부재를 인터페이스로 보완함**: C++는 `class Derived : public Base1, public Base2`처럼 여러 클래스를 동시에 상속하는 진짜 다중 상속을 지원했지만(`[[CPP Inheritance Multiple]]`), C#은 클래스 단위 다중 상속을 아예 지원하지 않고 대신 여러 인터페이스를 구현(implement)하는 방식으로 유사한 효과를 낸다는 점이 원문에서 직접 그 이유로 명시됨. [S1]
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- **인터페이스 구현에는 override가 필요 없음**: Abstract 챕터에서 abstract 클래스를 상속할 때는 override 키워드가 필수였지만, 인터페이스를 implement할 때는 override 없이 그냥 메서드를 정의하면 된다는 차이가 확인됨. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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IAnimal 인터페이스의 animalSound() 메서드를 Pig 클래스가 override 없이 그대로 구현해 호출하는 예제가 원문에서 직접 실전 활용 사례로 제시됨. [S1]
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## 💻 코드 패턴 (Code patterns)
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Interface implementation — no `override` keyword required (C#):
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```csharp
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interface IAnimal
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{
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void animalSound(); // no body
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}
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class Pig : IAnimal // "implements" -- same : syntax as inheritance
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{
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public void animalSound() // no `override` needed
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{
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Console.WriteLine("The pig says: wee wee");
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}
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}
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Pig myPig = new Pig();
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myPig.animalSound();
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.85
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[C# Tutorial]]
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- **관련 개념:** [[CSharp Abstract]], [[CSharp Interface Multi]], [[CPP Inheritance Multiple]]
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- **참조 맥락:** Interface 섹션 — Multiple Interfaces 챕터로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — C# Interface — https://www.w3schools.com/cs/cs_interface.php
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "C# Interface" page (Astra wiki-curation, P-Reinforce v3.1 format).
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