Master Visual Studio
2026 Development

// C# 14: Primary constructors on any class (VS 2026)
public class CustomerService(IRepository repo, ILogger logger)
{
    public async Task<Customer> GetByIdAsync(int id)
    {
        logger.LogInformation("Fetching customer {Id}", id);
        return await repo.FindAsync<Customer>(id);
    }
}

// C# 14: Collection expressions with spread + dictionary syntax
int[] first  = [1, 2, 3];
int[] second = [4, 5, 6];
int[] all    = [..first, ..second];  // Spread operator

// C# 14: params Span<T> — zero allocation variadic
static int Sum(params ReadOnlySpan<int> values)
    => MemoryMarshal.Cast<int, int>(values).ToArray().Sum();

// GitHub Copilot: describe intent as comment, Copilot writes the code
// Sort orders by date descending, group by customer, take top 5 per group
var grouped = orders
    .OrderByDescending(o => o.Date)
    .GroupBy(o => o.CustomerId)
    .Select(g => g.Take(5))
    .ToList();