BusinessLogic/BusinessLogic/RoleLogic.cs

@@ -1,6 +1,7 @@
 using Contracts.BindingModels;
 using Contracts.BusinessLogicContracts;
 using Contracts.Converters;
+using Contracts.Exceptions;
 using Contracts.SearchModels;
 using Contracts.StorageContracts;
 using Contracts.ViewModels;
@@ -24,21 +25,20 @@ namespace BusinessLogic.BusinessLogic
 			_roleStorage = roleStorage;
 		}
 
-		public RoleViewModel? Create(RoleBindingModel model)
+		public RoleViewModel Create(RoleBindingModel model)
 		{
 			ArgumentNullException.ThrowIfNull(model);
 
 			var role = _roleStorage.Insert(model);
 			if (role is null)
 			{
-				_logger.LogWarning("Insert operation failed.");
-				return null;
+				throw new Exception("Insert operation failed.");
 			}
 
 			return RoleConverter.ToView(role);
 		}
 
-		public RoleViewModel? Delete(RoleSearchModel model)
+		public RoleViewModel Delete(RoleSearchModel model)
 		{
 			ArgumentNullException.ThrowIfNull(model);
 
@@ -46,14 +46,13 @@ namespace BusinessLogic.BusinessLogic
 			var role = _roleStorage.Delete(model);
 			if (role is null)
 			{
-				_logger.LogWarning("Delete operation failed.");
-				return null;
+				throw new Exception("Delete operation failed.");
 			}
 
 			return RoleConverter.ToView(role);
 		}
 
-		public RoleViewModel? ReadElement(RoleSearchModel model)
+		public RoleViewModel ReadElement(RoleSearchModel model)
 		{
 			ArgumentNullException.ThrowIfNull(model);
 
@@ -61,8 +60,7 @@ namespace BusinessLogic.BusinessLogic
 			var role = _roleStorage.GetElement(model);
 			if (role is null)
 			{
-				_logger.LogWarning("ReadElement element not found");
-				return null;
+				throw new ElementNotFoundException();
 			}
 			_logger.LogInformation("ReadElement find. Id: {0}", role.Id);
 
@@ -83,15 +81,14 @@ namespace BusinessLogic.BusinessLogic
 			return list.Select(RoleConverter.ToView);
 		}
 
-		public RoleViewModel? Update(RoleBindingModel model)
+		public RoleViewModel Update(RoleBindingModel model)
 		{
 			ArgumentNullException.ThrowIfNull(model);
 
 			var role = _roleStorage.Update(model);
 			if (role is null)
 			{
-				_logger.LogWarning("Update operation failed.");
-				return null;
+				throw new Exception("Update operation failed.");
 			}
 			return RoleConverter.ToView(role);
 		}

BusinessLogic/BusinessLogic/UserLogic.cs

@@ -1,6 +1,7 @@
 using Contracts.BindingModels;
 using Contracts.BusinessLogicContracts;
 using Contracts.Converters;
+using Contracts.Exceptions;
 using Contracts.SearchModels;
 using Contracts.StorageContracts;
 using Contracts.ViewModels;
@@ -24,21 +25,20 @@ namespace BusinessLogic.BusinessLogic
 			_userStorage = userStorage;
 		}
 
-		public UserViewModel? Create(UserBindingModel model)
+		public UserViewModel Create(UserBindingModel model)
 		{
 			ArgumentNullException.ThrowIfNull(model);
 
 			var user = _userStorage.Insert(model);
 			if (user is null)
 			{
-				_logger.LogWarning("Insert operation failed.");
-				return null;
+				throw new Exception("Insert operation failed.");
 			}
 
 			return UserConverter.ToView(user);
 		}
 
-		public UserViewModel? Delete(UserSearchModel model)
+		public UserViewModel Delete(UserSearchModel model)
 		{
 			ArgumentNullException.ThrowIfNull(model);
 
@@ -46,8 +46,7 @@ namespace BusinessLogic.BusinessLogic
 			var user = _userStorage.Delete(model);
 			if (user is null)
 			{
-				_logger.LogWarning("Delete operation failed.");
-				return null;
+				throw new Exception("Update operation failed.");
 			}
 
 			return UserConverter.ToView(user);
@@ -67,7 +66,7 @@ namespace BusinessLogic.BusinessLogic
 			return list.Select(UserConverter.ToView);
 		}
 
-		public UserViewModel? ReadElement(UserSearchModel model)
+		public UserViewModel ReadElement(UserSearchModel model)
 		{
 			ArgumentNullException.ThrowIfNull(model);
 
@@ -75,23 +74,21 @@ namespace BusinessLogic.BusinessLogic
 			var user = _userStorage.GetElement(model);
 			if (user is null)
 			{
-				_logger.LogWarning("ReadElement element not found");
-				return null;
+				throw new ElementNotFoundException();
 			}
 			_logger.LogInformation("ReadElement find. Id: {0}", user.Id);
 
 			return UserConverter.ToView(user);
 		}
 
-		public UserViewModel? Update(UserBindingModel model)
+		public UserViewModel Update(UserBindingModel model)
 		{
 			ArgumentNullException.ThrowIfNull(model);
 
 			var user = _userStorage.Update(model);
 			if (user is null)
 			{
-				_logger.LogWarning("Update operation failed.");
-				return null;
+				throw new Exception("Update operation failed.");
 			}
 			return UserConverter.ToView(user);
 		}