---
id: csharp-oop
title: "C# - What is OOP?"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["object-oriented programming C#", "DRY principle", "C# OOP 소개"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.83
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["csharp", "programming-language", "w3schools", "oop"]
raw_sources: ["https://www.w3schools.com/cs/cs_oop.php"]
applied_in: []
github_commit: ""
---

# [[CSharp OOP]]

## 🎯 한 줄 통찰 (One-line insight)
Unlike Topic_C, which never had an OOP chapter at all (procedural only), and Topic_CPP, where OOP was introduced as an OPTIONAL paradigm layered on top of C-style procedural code, this C# chapter frames OOP as the language's core identity from the very first sentence — reinforcing what the Syntax chapter already forced structurally (every line of code must be inside a class): in C#, object-oriented isn't an available style choice the way it was for C++, it's the only way the language works. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Procedural vs. object-oriented** — procedural programming writes procedures/methods that operate on data; OOP creates objects that bundle BOTH data and methods together. [S1]
- **Claimed OOP advantages** — faster/easier to execute, clearer program structure, supports the DRY principle (Don't Repeat Yourself), enables reusable applications with less code and shorter development time. [S1]
- **DRY principle** — extract code common to the application into a single place and reuse it, instead of repeating it. [S1]
- **Class** — a template/blueprint for creating objects. [S1]
- **Object** — an instance of a class; created objects inherit all variables and methods from their class. [S1]
- **Class-vs-object illustration** — `Fruit` (class) → `Apple`, `Banana`, `Mango` (objects); `Car` (class) → `Volvo`, `Audi`, `Toyota` (objects). [S1]

## 📖 세부 내용 (Details)
- No code examples in this chapter — purely conceptual, deferring class/object syntax to the next chapter. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **OOP가 선택이 아니라 언어의 본질로 제시됨**: Topic_C에는 OOP 챕터 자체가 없었고(순수 절차적 언어), Topic_CPP는 OOP를 C 스타일 절차적 코드 위에 선택적으로 얹는 패러다임으로 소개했지만, C#은 Syntax 챕터에서 이미 확인된 "모든 코드는 class 안에" 구조적 강제를 그대로 반영해 OOP를 언어의 유일한 작동 방식으로 첫 문장부터 제시한다는 점이 확인됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — Fruit/Car를 class로, 그 인스턴스들을 object로 비유하는 개념 설명이 원문에서 제시됨. [S1]

## 💻 코드 패턴 (Code patterns)
없음 — 이 챕터는 코드 예제가 없는 개념 소개 챕터.

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.83
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[C# Tutorial]]
- **관련 개념:** [[CSharp Method Parameters Return]], [[CSharp Classes]], [[CPP OOP]]
- **참조 맥락:** OOP Basics 섹션 — Classes and Objects 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — C# - What is OOP? — https://www.w3schools.com/cs/cs_oop.php

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "C# - What is OOP?" page (Astra wiki-curation, P-Reinforce v3.1 format).