Constructor Assignment (Injection without boilerplate)

[LukeSamkharadze]

Imagine we have a container with injectables and one service that depends on that other services

AuthService.cs

public class AuthService {
    private AppDbContext appDb;
    private EmailAuthService emailAuthService;
    private ILogger<AuthService> logger;
    private IOptions<JwtSettings> jwtSettings;
    private ScopeTrackerService scopeTrackerService;
    private LocationService locationService;
    private MessageService messageService;
    private BlobService blobService;
    private MyProfileService myProfileService;
    private UserKeysService userKeysService;

    // Constructor that just stores injected objects
    // Boilerplate isn't it?
    public AuthService(
        AppDbContext appDb,
        ScopeTrackerService scopeTrackerService,
        ILogger<AuthService> logger,
        EmailAuthService emailAuthService
        ScopeTrackerService scopeTrackerService.
        LocationService locationService,
        MessageService messageService,
        BlobService blobService,
        MyProfileService myProfileService,
        UserKeysService userKeysService
        ) {
        this.emailAuthService = emailAuthService;
        this.logger = logger;
        this.jwtSettings = jwtSettings;
        this.appDb = appDb;
        this.scopeTrackerService = scopeTrackerService;
        this.locationService = locationService;
        this.messageService = messageService;
        this.blobService = blobService;
        this.myProfileService = myProfileService;
        this.userKeysService = userKeysService;
    }
    
    ...
}

What if we had constructor syntax the same as we have in Typescript Constructor Assignment

We would have

AuthService.cs

public class AuthService {
    public AuthService(
        private AppDbContext appDb;
        private EmailAuthService emailAuthService;
        private ILogger<AuthService> logger;
        private IOptions<JwtSettings> jwtSettings;
        private ScopeTrackerService scopeTrackerService;
        private LocationService locationService;
        private MessageService messageService;
        private BlobService blobService;
        private MyProfileService myProfileService;
        private UserKeysService userKeysService) { }
        
    ...
}

It would automatically store injected variables

[HaloFour]

See: #4025

[LukeSamkharadze]

As it seems that Issue is pretty much stale, do we have any news on that?

[Joe4evr]

Just because the discussion is stale doesn't mean it's not being thought about.