C# Records & Pattern Matching Cheat Sheet

public record Point(int X, int Y);              // Positional record, immutable by defaultvar p1 = new Point(1, 2);var p2 = new Point(1, 2);Console.WriteLine(p1 == p2);                     // True: value-based equalityvar p3 = p1 with { Y = 5 };                      // Non-destructive mutation: copies p1, changes YConsole.WriteLine(p3);                           // Point { X = 1, Y = 5 } (auto ToString)public record class Person(string Name, int Age); // record class (reference type, the default)public record struct Coord(double Lat, double Lng); // record struct (value type)

object value = 42;string description = value switch{    int n when n < 0 => "negative",    0 => "zero",    int n and > 0 and < 10 => "small positive",   // Relational + logical patterns    int => "large integer",    string s => $"a string: {s}",    null => "nothing",    _ => "unknown"};if (value is int number && number > 10)           // Type pattern + condition{    Console.WriteLine($"Big number: {number}");}

var point = new Point(3, 4);var (x, y) = point;                     // Deconstruction (auto-generated for records)string quadrant = point switch{    Point { X: > 0, Y: > 0 } => "Q1",   // Property pattern matching on record members    Point { X: < 0, Y: > 0 } => "Q2",    Point(0, 0) => "Origin",             // Positional record pattern    _ => "Other"};