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| == Grundlagen == | | == Frontend Frameworks – Reifegrade == |
| ; Deklaration
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| <syntaxhighlight lang="csharp">
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| string name = "Alice";
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| string leer = string.Empty;
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| </syntaxhighlight>
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| ; Verkettung | | ; Tier-Definition (Kurzfassung) |
| <syntaxhighlight lang="csharp">
| | * Tier 1: Weit verbreitet, stabil, Langzeitpflege, starkes Ökosystem |
| string full = vorname + " " + nachname;
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| string interp = $"{vorname} {nachname}";
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| var builder = new StringBuilder().Append(vorname).Append(' ').Append(nachname).ToString();
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| </syntaxhighlight>
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| == Häufig genutzte Eigenschaften ==
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| * Length – Anzahl der UTF-16 Codeeinheiten (nicht zwingend Benutzer-grafeme)
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| == Vergleich ==
| | {| class="wikitable sortable" |
| <syntaxhighlight lang="csharp">
| | ! Tier !! Framework !! Kategorie !! Erstveröffentlichung !! Governance/Backing !! Release-/LTS-Kadenz !! Kurzbewertung |
| string.Equals(a, b); // Ordinal, case-sensitiv
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| string.Equals(a, b, StringComparison.OrdinalIgnoreCase);
| | | 1 || React || Bibliothek || 2013 || Meta + Community || regelmäßig || Dominantes Ökosystem, sehr stabil |
| a.Equals(b, StringComparison.Ordinal);
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| a == b; // Wertvergleich
| | | 1 || Angular || Framework || 2016 || Google || LTS || Enterprise‑fokussiert, integrierter Stack |
| string.Compare(a, b, StringComparison.Ordinal);
| | |- |
| </syntaxhighlight>
| | | 1 || Vue.js || Framework || 2014 || Core‑Team + Community || regelmäßig || Reif, breite Adoption |
| | |- |
| | | 1 || Next.js || Meta‑Framework (React) || 2016 || Vercel || schnell || Produktionsreif, SSR/ISR/RSC |
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| == Suchen ==
| | |} |
| <syntaxhighlight lang="csharp">
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| str.Contains("abc", StringComparison.Ordinal);
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| str.StartsWith("pre", StringComparison.OrdinalIgnoreCase);
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| str.EndsWith("suf", StringComparison.Ordinal);
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| str.IndexOf("x", StringComparison.Ordinal);
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| str.LastIndexOf('.');
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| </syntaxhighlight>
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| == Extrahieren ==
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| <syntaxhighlight lang="csharp">
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| str.Substring(startIndex);
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| str.Substring(startIndex, length);
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| str[startIndex]; // einzelnes char
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| </syntaxhighlight>
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| == Teilstrings moderner (Span-Slicing) ==
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| <syntaxhighlight lang="csharp">
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| ReadOnlySpan<char> span = str.AsSpan();
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| var teil = span.Slice(5, 3); // vermeidet Kopie
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| </syntaxhighlight>
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| == Aufteilen & Zusammenfügen ==
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| <syntaxhighlight lang="csharp">
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| var parts = str.Split('.', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
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| string joined = string.Join(";", parts);
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| </syntaxhighlight>
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| == Trimmen ==
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| <syntaxhighlight lang="csharp">
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| str.Trim(); // Whitespace
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| str.TrimStart();
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| str.TrimEnd();
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| str.Trim('0'); // spezifische Zeichen
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| </syntaxhighlight>
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| == Ersetzen ==
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| <syntaxhighlight lang="csharp">
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| str.Replace("alt", "neu");
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| str.Replace('a', 'b');
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| Regex.Replace(str, "[0-9]+", "#");
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| </syntaxhighlight>
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| | |
| == Formatierung ==
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| <syntaxhighlight lang="csharp">
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| string.Format("Wert: {0:N2}", value);
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| $"Wert: {value:N2}";
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| value.ToString("N2", CultureInfo.InvariantCulture);
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| </syntaxhighlight>
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| == Groß/Kleinschreibung ==
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| <syntaxhighlight lang="csharp">
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| str.ToUpperInvariant();
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| str.ToLower(CultureInfo.CurrentCulture);
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| </syntaxhighlight>
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| == Einfügen & Entfernen ==
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| <syntaxhighlight lang="csharp">
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| str.Insert(index, "XYZ");
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| str.Remove(startIndex);
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| str.Remove(startIndex, count);
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| </syntaxhighlight>
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| == Pad (Auffüllen) ==
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| <syntaxhighlight lang="csharp">
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| "42".PadLeft(5, '0'); // 00042
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| "42".PadRight(5, '.'); // 42...
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| </syntaxhighlight>
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| == Zeichenprüfung ==
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| <syntaxhighlight lang="csharp">
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| char.IsLetterOrDigit(ch);
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| char.IsWhiteSpace(ch);
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| </syntaxhighlight>
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| == Immutable Hinweis ==
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| Strings sind unveränderlich. Viele Operationen erzeugen neue Instanzen. Für viele Verkettungen: StringBuilder.
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| == StringBuilder ==
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| <syntaxhighlight lang="csharp">
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| var sb = new StringBuilder(capacity:256)
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| .Append("Zeile ").AppendLine("1")
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| .AppendFormat("Wert={0}", 123);
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| string result = sb.ToString();
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| </syntaxhighlight>
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| | |
| == Sicherheitsrelevante Vergleiche ==
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| <syntaxhighlight lang="csharp">
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| CryptographicOperations.FixedTimeEquals(
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| MemoryMarshal.AsBytes("secret"u8),
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| MemoryMarshal.AsBytes(eingabe.AsSpan()));
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| </syntaxhighlight>
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| | |
| == Null / Empty / WhiteSpace ==
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| <syntaxhighlight lang="csharp">
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| string.IsNullOrEmpty(str);
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| string.IsNullOrWhiteSpace(str);
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| </syntaxhighlight>
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| == Interpolated String Handler (Performance) ==
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| <syntaxhighlight lang="csharp">
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| [InterpolatedStringHandler]
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| public ref struct LogHandler {
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| // eigener Handler für Logging
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| }
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| </syntaxhighlight>
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| | |
| == Raw String Literals (C# 11) ==
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| <syntaxhighlight lang="csharp">
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| string json = """
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| {
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| "id": 1,
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| "name": "Alice"
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| }
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| """;
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| </syntaxhighlight>
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| == Escapes ==
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| <syntaxhighlight lang="csharp">
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| string pfad = @"C:\Temp\log.txt";
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| string zeile = "Text\nNeue Zeile\tTab";
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| </syntaxhighlight>
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| == Normalisierung (Unicode) ==
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| <syntaxhighlight lang="csharp">
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| string norm = str.Normalize(NormalizationForm.FormC);
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| </syntaxhighlight>
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| == Split vs Span ==
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| Für Hochleistung: str.AsSpan().Split(...) (ab .NET 8: MemoryExtensions.Split)
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| == Zusammenfassung ==
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| Kurzliste: Length, Indexer, Substring, Contains, StartsWith, EndsWith, IndexOf, Split, Join, Trim*, Replace, Insert, Remove, PadLeft/Right, ToUpper*/ToLower*, Format/$-Interpolation, Equals/Compare, Normalize, StringBuilder.
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Frontend Frameworks – Reifegrade
- Tier-Definition (Kurzfassung)
- Tier 1: Weit verbreitet, stabil, Langzeitpflege, starkes Ökosystem
| Tier |
Framework |
Kategorie |
Erstveröffentlichung |
Governance/Backing |
Release-/LTS-Kadenz |
Kurzbewertung
|
| 1 |
React |
Bibliothek |
2013 |
Meta + Community |
regelmäßig |
Dominantes Ökosystem, sehr stabil
|
| 1 |
Angular |
Framework |
2016 |
Google |
LTS |
Enterprise‑fokussiert, integrierter Stack
|
| 1 |
Vue.js |
Framework |
2014 |
Core‑Team + Community |
regelmäßig |
Reif, breite Adoption
|
| 1 |
Next.js |
Meta‑Framework (React) |
2016 |
Vercel |
schnell |
Produktionsreif, SSR/ISR/RSC
|