Tópicos importantes de C#

Pattern Matching

Patterns combine type checks, extraction, and conditions without unsafe casts.

How it works

Inspect types and values with declarative patterns.

The switch expression handles null, positive integers, non-empty strings, and a final fallback in one exhaustive expression.

Runnable C# example

Run code →

Program.cs

using System;

class Program
{
    static string Describe(object? value) => value switch
    {
        null => "missing",
        int number when number > 0 => $"positive {number}",
        string { Length: > 0 } text => $"text: {text}",
        _ => "other"
    };

    static void Main() => Console.WriteLine(Describe(12));
}

Expected output

positive 12

Practice with the debugger

Set a breakpoint on an important assignment or condition, click Debug, and inspect the local values before stepping to the next line.