ArgumentNullException handling using throw expressions

Solves dotnet-architecture#64

Author: eiximenis

src/Services/Identity/Identity.API/Services/ProfileService.cs

@@ -22,8 +22,7 @@ public ProfileService(UserManager<ApplicationUser> userManager)
 
         async public Task GetProfileDataAsync(ProfileDataRequestContext context)
         {
-            var subject = context.Subject;
-            if (subject == null) throw new ArgumentNullException(nameof(context.Subject));
+            var subject = context.Subject ?? throw new ArgumentNullException(nameof(context.Subject));
 
             var subjectId = subject.Claims.Where(x => x.Type == "sub").FirstOrDefault().Value;
 
@@ -37,8 +36,7 @@ async public Task GetProfileDataAsync(ProfileDataRequestContext context)
 
         async public Task IsActiveAsync(IsActiveContext context)
         {
-            var subject = context.Subject;
-            if (subject == null) throw new ArgumentNullException(nameof(context.Subject));
+            var subject = context.Subject ?? throw new ArgumentNullException(nameof(context.Subject));
 
             var subjectId = subject.Claims.Where(x => x.Type == "sub").FirstOrDefault().Value;
             var user = await _userManager.FindByIdAsync(subjectId);

src/Services/Ordering/Ordering.API/Application/Commands/CreateOrderCommandHandler.cs

@@ -15,18 +15,8 @@ public class CreateOrderCommandHandler
         // Using DI to inject infrastructure persistence Repositories
         public CreateOrderCommandHandler(IBuyerRepository buyerRepository, IOrderRepository orderRepository)
         {
-            if (buyerRepository == null)
-            {
-                throw new ArgumentNullException(nameof(buyerRepository));
-            }
-
-            if (orderRepository == null)
-            {
-                throw new ArgumentNullException(nameof(orderRepository));
-            }
-
-            _buyerRepository = buyerRepository;
-            _orderRepository = orderRepository;
+            _buyerRepository = buyerRepository ?? throw new ArgumentNullException(nameof(buyerRepository));
+            _orderRepository = orderRepository ?? throw new ArgumentNullException(nameof(orderRepository));
         }
 
         public async Task<bool> Handle(CreateOrderCommand message)

src/Services/Ordering/Ordering.API/Application/Queries/OrderQueries.cs

@@ -15,7 +15,7 @@ public class OrderQueries
 
         public OrderQueries(string constr)
         {
-            _connectionString = constr;
+            _connectionString = !string.IsNullOrWhiteSpace(constr) ? constr : throw new ArgumentNullException(nameof(constr));
         }
 
 

src/Services/Ordering/Ordering.API/Controllers/OrdersController.cs

@@ -20,24 +20,10 @@ public class OrdersController : Controller
 
         public OrdersController(IMediator mediator, IOrderQueries orderQueries, IIdentityService identityService)
         {
-            if (mediator == null)
-            {
-                throw new ArgumentNullException(nameof(mediator));
-            }
-
-            if (orderQueries == null)
-            {
-                throw new ArgumentNullException(nameof(orderQueries));
-            }
-
-            if (identityService == null)
-            {
-                throw new ArgumentException(nameof(identityService));
-            }
 
-            _mediator = mediator;
-            _orderQueries = orderQueries;
-            _identityService = identityService;
+            _mediator = mediator ?? throw new ArgumentNullException(nameof(mediator));
+            _orderQueries = orderQueries ?? throw new ArgumentNullException(nameof(orderQueries));
+            _identityService = identityService ?? throw new ArgumentNullException(nameof(identityService));
         }
 
         [Route("new")]

src/Services/Ordering/Ordering.API/Infrastructure/Services/IdentityService.cs

@@ -13,12 +13,7 @@ public class IdentityService : IIdentityService
 
         public IdentityService(IHttpContextAccessor context)
         {
-            if (context == null)
-            {
-                throw new ArgumentNullException(nameof(context));
-            }
-
-            _context = context;
+            _context = context ?? throw new ArgumentNullException(nameof(context));
         }
 
         public string GetUserIdentity()

src/Services/Ordering/Ordering.Domain/AggregatesModel/BuyerAggregate/Buyer.cs

@@ -21,12 +21,7 @@ protected Buyer() {
 
         public Buyer(string identity) : this()
         {
-            if (String.IsNullOrWhiteSpace(identity))
-            {
-                throw new ArgumentNullException(nameof(identity));
-            }
-
-            IdentityGuid = identity;
+            IdentityGuid = !string.IsNullOrWhiteSpace(identity) ? identity : throw new ArgumentNullException(nameof(identity));
 
         }
 

src/Services/Ordering/Ordering.Domain/AggregatesModel/BuyerAggregate/PaymentMethod.cs

@@ -21,30 +21,17 @@ protected PaymentMethod() { }
 
         public PaymentMethod(int cardTypeId, string alias, string cardNumber, string securityNumber, string cardHolderName, DateTime expiration)
         {
-            if (String.IsNullOrWhiteSpace(cardNumber))
-            {
-                throw new ArgumentException(nameof(cardNumber));
-            }
 
-            if (String.IsNullOrWhiteSpace(securityNumber))
-            {
-                throw new ArgumentException(nameof(securityNumber));
-            }
-
-            if (String.IsNullOrWhiteSpace(cardHolderName))
-            {
-                throw new ArgumentException(nameof(cardHolderName));
-            }
+            _cardNumber = !string.IsNullOrWhiteSpace(cardNumber) ? cardNumber : throw new ArgumentException(nameof(cardNumber));
+            _securityNumber = !string.IsNullOrWhiteSpace(securityNumber) ? securityNumber : throw new ArgumentException(nameof(securityNumber));
+            _cardHolderName = !string.IsNullOrWhiteSpace(cardHolderName) ? cardHolderName : throw new ArgumentException(nameof(cardHolderName));
 
             if (expiration < DateTime.UtcNow)
             {
                 throw new ArgumentException(nameof(expiration));
             }
 
             _alias = alias;
-            _cardNumber = cardNumber;
-            _securityNumber = securityNumber;
-            _cardHolderName = cardHolderName;
             _expiration = expiration;
             _cardTypeId = cardTypeId;
         }

src/Services/Ordering/Ordering.Infrastructure/Repositories/BuyerRepository.cs

@@ -22,12 +22,7 @@ public IUnitOfWork UnitOfWork
 
         public BuyerRepository(OrderingContext context)
         {
-            if (context == null)
-            {
-                throw new ArgumentNullException(nameof(context));
-            }
-
-            _context = context;
+            _context = context ?? throw new ArgumentNullException(nameof(context));
         }
 
         public Buyer Add(Buyer buyer)

src/Services/Ordering/Ordering.Infrastructure/Repositories/OrderRepository.cs

@@ -19,12 +19,7 @@ public IUnitOfWork UnitOfWork
 
         public OrderRepository(OrderingContext context)
         {
-            if (context == null)
-            {
-                throw new ArgumentNullException(nameof(context));
-            }
-
-            _context = context;
+            _context = context ?? throw new ArgumentNullException(nameof(context));
         }
 
         public Order Add(Order order)