Simplifying boilerplate dependency injection with C# 12 Primary Constructors:

// C# 12 Primary Constructor syntax
public class PaymentProcessor(ILogger<PaymentProcessor> logger, IPaymentGateway gateway, IOrderRepository repo)
{
    public async Task ProcessAsync(OrderId id)
    {
        logger.LogInformation("Processing order {Id}", id);
        await gateway.ChargeAsync(id);
        await repo.MarkAsPaidAsync(id);
    }
}

Eliminates private field declarations (private readonly ILogger _logger;) and constructor assignment boilerplate, making service classes concise and readable!

Primary constructors make ASP.NET Core service and controller definitions 50% shorter.

Works on records, classes, and struct types across the board.