2nd/10_Wiki/Topics/Domain_Programming/Topic_CSharp/CSharp_Strings.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
csharp-strings	C# Strings	Programming_Language	draft	conceptual		.Length property ToUpper ToLower C# 문자열		B	0.84	2026-07-04	2026-07-04			csharp programming-language w3schools strings	https://www.w3schools.com/cs/cs_strings.php

CSharp Strings

🎯 한 줄 통찰 (One-line insight)

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]

🧠 핵심 개념 (Core concepts)

• String = object with properties and methods — unlike C's raw char arrays, a C# string is genuinely an object. [S1]
• .Length property — no parentheses; accessed like a field, not called like a function (txt.Length, NOT txt.Length()). [S1]
• .ToUpper() / .ToLower() — methods (with parentheses) that return a NEW string converted to upper/lower case, leaving the original unchanged. [S1]

📖 세부 내용 (Details)

• Basic declaration: string greeting = "Hello"; / multi-word: string greeting2 = "Nice to meet you!";. [S1]
• Length: string txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; Console.WriteLine("The length of the txt string is: " + txt.Length); → 26. [S1]
• Case conversion: string txt = "Hello World"; Console.WriteLine(txt.ToUpper()); Console.WriteLine(txt.ToLower());. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• Length가 메서드가 아니라 프로퍼티임: C++의 std::string::length()와 Java의 .length()는 둘 다 괄호를 붙여 호출하는 메서드였지만, C#의 .Length는 괄호 없이 필드처럼 접근하는 프로퍼티라는 점이 확인됨 — C#은 "상태를 읽는 것(프로퍼티)"과 "동작을 호출하는 것(메서드, 예: .ToUpper())"을 문법적으로 구분함. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 문자열 길이 출력과 대소문자 변환 예제가 원문에서 제시됨. [S1]

💻 코드 패턴 (Code patterns)

Property access (no parens) vs. method call (with parens) on a string (C#):

string txt = "Hello World";
Console.WriteLine(txt.Length);     // property -- no parentheses -> 11
Console.WriteLine(txt.ToUpper());  // method -- parentheses -> "HELLO WORLD"
Console.WriteLine(txt.ToLower());  // method -- parentheses -> "hello world"

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.84
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: C# Tutorial
• 관련 개념: CSharp Strings Concat, CPP Strings, Java Strings
• 참조 맥락: Strings 섹션 — String Concatenation 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — C# Strings — https://www.w3schools.com/cs/cs_strings.php

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "C# Strings" page (Astra wiki-curation, P-Reinforce v3.1 format).