{
    "api": "YAML JSON TOON Database",
    "version": "1.0.0",
    "format": "json",
    "dataset": {
        "id": 52,
        "slug": "csharp-dotnet-features",
        "title": "C# and .NET Modern Features",
        "description": "Modern C# features (C# 8-12) and .NET capabilities: nullable reference types, records, pattern matching, LINQ, async streams, minimal APIs.",
        "category": "Programming Languages",
        "category_slug": "programming-languages",
        "tags": "csharp,dotnet,nullable-reference-types,records,pattern-matching,linq,async-streams",
        "view_count": 0,
        "created_at": 1778695229,
        "updated_at": 1778695229
    },
    "data": {
        "features": [
            {"name": "Nullable Reference Types", "version": "C# 8.0 / .NET Core 3.0", "description": "Compiler warnings for potential NullReferenceException: string? means nullable, string means non-nullable", "example": "string? middleName = null; string firstName = middleName ?? \"Unknown\";", "notes": "Enable with <Nullable>enable</Nullable> in .csproj"},
            {"name": "Records", "version": "C# 9.0 / .NET 5", "description": "Immutable reference types with value equality, positional syntax, with-expressions for non-mutating updates", "example": "public record Person(string FirstName, string LastName); var p2 = p1 with { LastName = \"Smith\" };", "notes": "Use record class for reference semantics, record struct for value semantics"},
            {"name": "Pattern Matching", "version": "C# 8-12", "description": "Type patterns, property patterns, relational patterns, list patterns for expressive conditional logic", "example": "return shape switch { Circle c => c.Radius * c.Radius * Math.PI, Rectangle r => r.Width * r.Height, _ => 0 };", "notes": "Evolves each version: C# 7 (is/switch), C# 8 (property/recursive), C# 10 (extended), C# 12 (list)"},
            {"name": "LINQ", "version": "C# 3.0 / .NET Framework 3.5", "description": "Language Integrated Query: declarative data querying with deferred execution, query syntax and method syntax", "example": "var adults = people.Where(p => p.Age >= 18).Select(p => p.Name).OrderBy(n => n);", "notes": "Works with any IEnumerable<T>; IQueryable<T> for remote execution (EF Core, SQL)"},
            {"name": "Async Streams", "version": "C# 8.0 / .NET Core 3.0", "description": "IAsyncEnumerable<T> for asynchronous iteration over sequences, await foreach", "example": "await foreach (var item in GetItemsAsync()) { Process(item); }", "notes": "Essential for paginated APIs, database queries, real-time data streams"},
            {"name": "Minimal APIs", "version": ".NET 6", "description": "Simplified HTTP API building without controllers: app.MapGet(\"/\", () => \"Hello\")", "example": "var app = WebApplication.Create(args); app.MapGet(\"/todos/{id}\", (int id, TodoDb db) => db.Todos.FindAsync(id));", "notes": "Reduces boilerplate for small APIs; use for microservices, prototypes, simple backends"},
            {"name": "Primary Constructors", "version": "C# 12 / .NET 8", "description": "Constructor parameters directly on class/struct declaration, accessible as instance fields", "example": "public class Person(string firstName, string lastName) { public string FullName => $\"{firstName} {lastName}\"; }", "notes": "Reduces boilerplate; parameters are in scope for the entire class body"},
            {"name": "Source Generators", "version": ".NET 5 / Roslyn 3.8", "description": "Compile-time code generation: analyze syntax trees and emit new C# source files", "example": "[GenerateSerializer] public class MyData { } // Generates serialization code at compile time", "notes": "Used by System.Text.Json, EF Core, gRPC; eliminates runtime reflection overhead"}
        ]
    }
}