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Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
69 lines
3.7 KiB
Markdown
69 lines
3.7 KiB
Markdown
---
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id: csharp-strings
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title: "C# Strings"
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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: [".Length property", "ToUpper ToLower", "C# 문자열"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.84
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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", "strings"]
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raw_sources: ["https://www.w3schools.com/cs/cs_strings.php"]
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applied_in: []
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github_commit: ""
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---
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# [[CSharp Strings]]
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## 🎯 한 줄 통찰 (One-line insight)
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C# exposes string length as a PROPERTY (`txt.Length`, no parentheses) rather than a METHOD call, which is a subtle but real divergence from both C++'s `std::string::length()` (a method call with parens) and Java's `.length()` (also a method call) — the tutorial's own example (`txt.Length`) reveals that C# treats a string "as an object" but distinguishes properties (state you read) from methods (behavior you invoke, like `.ToUpper()`), a distinction C++/Java collapse into "just call a method for everything." [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **String = object with properties and methods** — unlike C's raw char arrays, a C# string is genuinely an object. [S1]
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- **`.Length` property** — no parentheses; accessed like a field, not called like a function (`txt.Length`, NOT `txt.Length()`). [S1]
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- **`.ToUpper()` / `.ToLower()`** — methods (with parentheses) that return a NEW string converted to upper/lower case, leaving the original unchanged. [S1]
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## 📖 세부 내용 (Details)
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- Basic declaration: `string greeting = "Hello";` / multi-word: `string greeting2 = "Nice to meet you!";`. [S1]
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- Length: `string txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; Console.WriteLine("The length of the txt string is: " + txt.Length);` → 26. [S1]
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- Case conversion: `string txt = "Hello World"; Console.WriteLine(txt.ToUpper()); Console.WriteLine(txt.ToLower());`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **Length가 메서드가 아니라 프로퍼티임**: C++의 `std::string::length()`와 Java의 `.length()`는 둘 다 괄호를 붙여 호출하는 메서드였지만, C#의 `.Length`는 괄호 없이 필드처럼 접근하는 프로퍼티라는 점이 확인됨 — C#은 "상태를 읽는 것(프로퍼티)"과 "동작을 호출하는 것(메서드, 예: `.ToUpper()`)"을 문법적으로 구분함. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 문자열 길이 출력과 대소문자 변환 예제가 원문에서 제시됨. [S1]
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## 💻 코드 패턴 (Code patterns)
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Property access (no parens) vs. method call (with parens) on a string (C#):
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```csharp
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string txt = "Hello World";
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Console.WriteLine(txt.Length); // property -- no parentheses -> 11
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Console.WriteLine(txt.ToUpper()); // method -- parentheses -> "HELLO WORLD"
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Console.WriteLine(txt.ToLower()); // method -- parentheses -> "hello world"
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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:** 0.84
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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 Strings Concat]], [[CPP Strings]], [[Java Strings]]
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- **참조 맥락:** Strings 섹션 — String Concatenation 챕터로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — C# Strings — https://www.w3schools.com/cs/cs_strings.php
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "C# Strings" page (Astra wiki-curation, P-Reinforce v3.1 format).
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