Exception handling

WD7UVN_HFT_2023241.Endpoint/Controllers/CustomerController.cs

@@ -2,6 +2,7 @@ using Microsoft.AspNetCore.Mvc;
 using WD7UVN_HFT_2023241.Logic;
 using System.Linq;
 using WD7UVN_HFT_2023241.Models;
+using System;
 
 namespace WD7UVN_HFT_2023241.Endpoint
 {
@@ -17,16 +18,30 @@ namespace WD7UVN_HFT_2023241.Endpoint
         }
 
         [HttpGet()]
-        public IQueryable<Customer> ReadAllCustomers()
+        public IQueryable<Customer>? ReadAllCustomers()
+        {
+            try
             {
                 return LogicServices.CRUDOperations.ReadAllCustomers();
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+        }
 
         [HttpGet("{id}")]
-        public Customer ReadCustomer(int id)
+        public Customer? ReadCustomer(int id)
+        {
+            try
             {
                 return LogicServices.CRUDOperations.ReadCustomer(id);
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+        }
 
         [HttpPut()]
         public void PutCustomer([FromBody] Customer e)

WD7UVN_HFT_2023241.Endpoint/Controllers/EmployeeController.cs

@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Mvc;
 using WD7UVN_HFT_2023241.Logic;
 using System.Linq;
+using System;
 using WD7UVN_HFT_2023241.Models;
 
 namespace WD7UVN_HFT_2023241.Endpoint
@@ -17,16 +18,30 @@ namespace WD7UVN_HFT_2023241.Endpoint
         }
 
         [HttpGet()]
-        public IQueryable<Employee> ReadAllEmployees()
+        public IQueryable<Employee>? ReadAllEmployees()
+        {
+            try
             {
                 return LogicServices.CRUDOperations.ReadAllEmployees();
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+        }
 
         [HttpGet("{id}")]
-        public Employee ReadEmployee(int id)
+        public Employee? ReadEmployee(int id)
+        {
+            try
             {
                 return LogicServices.CRUDOperations.ReadEmployee(id);
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+        }
 
         [HttpPut()]
         public void PutEmployee([FromBody] Employee e)

WD7UVN_HFT_2023241.Endpoint/Controllers/MaintainerTeamController.cs

@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Mvc;
 using WD7UVN_HFT_2023241.Logic;
 using System.Linq;
+using System;
 using WD7UVN_HFT_2023241.Models;
 
 namespace WD7UVN_HFT_2023241.Endpoint
@@ -17,16 +18,30 @@ namespace WD7UVN_HFT_2023241.Endpoint
         }
 
         [HttpGet()]
-        public IQueryable<MaintainerTeam> ReadAllMaintainerTeams()
+        public IQueryable<MaintainerTeam>? ReadAllMaintainerTeams()
+        {
+            try
             {
                 return LogicServices.CRUDOperations.ReadAllMaintainerTeams();
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+        }
 
         [HttpGet("{id}")]
-        public MaintainerTeam ReadMaintainerTeam(int id)
+        public MaintainerTeam? ReadMaintainerTeam(int id)
+        {
+            try
             {
                 return LogicServices.CRUDOperations.ReadMaintainerTeam(id);
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+        }
 
         [HttpPut()]
         public void PutMaintainerTeam([FromBody] MaintainerTeam e)

WD7UVN_HFT_2023241.Endpoint/Controllers/ServiceController.cs

@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Mvc;
 using WD7UVN_HFT_2023241.Logic;
 using System.Linq;
+using System;
 using WD7UVN_HFT_2023241.Models;
 
 namespace WD7UVN_HFT_2023241.Endpoint
@@ -17,16 +18,30 @@ namespace WD7UVN_HFT_2023241.Endpoint
         }
 
         [HttpGet()]
-        public IQueryable<Service> ReadAllServices()
+        public IQueryable<Service>? ReadAllServices()
+        {
+            try
             {
                 return LogicServices.CRUDOperations.ReadAllServices();
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+        }
 
         [HttpGet("{id}")]
-        public Service ReadService(int id)
+        public Service? ReadService(int id)
+        {
+            try
             {
                 return LogicServices.CRUDOperations.ReadService(id);
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+        }
 
 [HttpPut()]
         public void PutService([FromBody] Service e)

WD7UVN_HFT_2023241.Endpoint/Controllers/SubOrdinateController.cs

@@ -1,4 +1,5 @@
 using Microsoft.AspNetCore.Mvc;
+using System;
 using WD7UVN_HFT_2023241.Logic;
 using System.Linq;
 using WD7UVN_HFT_2023241.Models;
@@ -17,9 +18,16 @@ namespace WD7UVN_HFT_2023241.Endpoint
         }
 
 		[HttpGet()]
-		public IQueryable<Employee> GetSubordinates([FromQuery] int id)
+		public IQueryable<Employee>? GetSubordinates([FromQuery] int id)
+		{
+            try
             {
 			    return LogicServices.GetSubordinates(id);
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+		}
     }
 }

WD7UVN_HFT_2023241.Endpoint/Controllers/WhoIsResponsibleForServiceController.cs

@@ -1,6 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
+using System;
 using WD7UVN_HFT_2023241.Logic;
-using System.Linq;
 using WD7UVN_HFT_2023241.Models;
 
 namespace WD7UVN_HFT_2023241.Endpoint
@@ -17,9 +17,16 @@ namespace WD7UVN_HFT_2023241.Endpoint
         }
 
 		[HttpGet()]
-		public Employee WhoIsResponsibleForService([FromQuery] int id)
+		public Employee? WhoIsResponsibleForService([FromQuery] int id)
+		{
+            try
             {
                 return LogicServices.WhoIsResponsibleForService(id);
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+        }
     }
 }

WD7UVN_HFT_2023241.Endpoint/Controllers/WhoMaintainsServiceController.cs

@@ -1,4 +1,5 @@
 using Microsoft.AspNetCore.Mvc;
+using System;
 using WD7UVN_HFT_2023241.Logic;
 using System.Linq;
 using WD7UVN_HFT_2023241.Models;
@@ -17,9 +18,16 @@ namespace WD7UVN_HFT_2023241.Endpoint
         }
 
 		[HttpGet()]
-		public IQueryable<Employee> WhoUsesService([FromQuery] int id)
+		public IQueryable<Employee>? WhoUsesService([FromQuery] int id)
+		{
+            try
             {
 			    return LogicServices.WhoMaintainsService(id);
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+		}
     }
 }

WD7UVN_HFT_2023241.Endpoint/Controllers/WhoUsesServiceController.cs

@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Mvc;
 using WD7UVN_HFT_2023241.Logic;
 using System.Linq;
+using System;
 using WD7UVN_HFT_2023241.Models;
 
 namespace WD7UVN_HFT_2023241.Endpoint
@@ -17,9 +18,16 @@ namespace WD7UVN_HFT_2023241.Endpoint
         }
 
 		[HttpGet()]
-		public IQueryable<Customer> WhoUsesService([FromQuery] int id)
+		public IQueryable<Customer>? WhoUsesService([FromQuery] int id)
+		{
+            try
             {
 			    return LogicServices.WhoUsesService(id);
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+		}
     }
 }

WD7UVN_HFT_2023241.Endpoint/Controllers/WhoWorksInMaintainerTeamController.cs

@@ -1,7 +1,9 @@
 using Microsoft.AspNetCore.Mvc;
+using System;
 using WD7UVN_HFT_2023241.Logic;
 using System.Linq;
 using WD7UVN_HFT_2023241.Models;
+using Microsoft.AspNetCore.Mvc.Diagnostics;
 
 namespace WD7UVN_HFT_2023241.Endpoint
 {
@@ -17,9 +19,16 @@ namespace WD7UVN_HFT_2023241.Endpoint
         }
 
 		[HttpGet()]
-		public IQueryable<Employee> WhoWorksInMaintainerTeam([FromQuery] int id)
+		public IQueryable<Employee>? WhoWorksInMaintainerTeam([FromQuery] int id)
+		{
+            try
             {
 			    return LogicServices.WhoWorksInMaintainerTeam(id);
             }
+            catch (NullReferenceException)
+            {
+                return null;
+            }
+		}
     }
 }