Null checking with primary constructor in C# 12

Null checking with primary constructor in C# 12

By Ritesh Sahu - November 29, 2023

I using C# 12. In C# 12 I can use primary constructor:

public class UserService(IUnitOfWork uow) : IUserService
{

}

Before C# 12 I used null checking for items that I inject in constructor:

public class UserService : IUserService
{
    private readonly IUnitOfWork _uow;

    public UserService(IUnitOfWork uow)
    {
        ArgumentNullException.ThrowIfNull(uow);
        _uow = uow;
    }
}

Now how can I do null checking in C# 12 ?
Is it need to use fail fast with primary constructor ?

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