Bits of .NET

Writing constructors with property assignment is repetitive. C# 12 primary constructors simplify it.

Old Way:

public class ProductService
{
    private readonly ILogger _logger;
    private readonly IProductRepository _repo;

    public ProductService(ILogger logger, IProductRepository repo)
    {
        _logger = logger;
        _repo = repo;
    }

    public void DoWork()
    {
        _logger.LogInfo("Working");
        _repo.Save();
    }
}

Primary Constructor (C# 12):

public class ProductService(ILogger logger, IProductRepository repo)
{
    public void DoWork()
    {
        logger.LogInfo("Working");  // Directly accessible!
        repo.Save();
    }
}

// Parameters become fields automatically
// No manual property assignment needed

With Properties:

public class Person(string firstName, string lastName, int age)
{
    public string FullName => $"{firstName} {lastName}";
    public bool IsAdult => age >= 18;
}

var person = new Person("John", "Doe", 30);
Console.WriteLine(person.FullName);  // "John Doe"

Less boilerplate, same functionality!