Value cannot be null. (Parameter 'key') On Web API POST Method
Question
So Basically I Have Created Add Cars Method In CarsRepository.cs
public int AddCar(Car car)
{
_carRentalSystemContext.Cars.Add(car);
_carRentalSystemContext.SaveChanges();
return 1;
}
In CarsService.cs
public int AddCar(Car car)
{
return _icarsRepository.AddCar(car);
}
In Both ICarsRepository And ICarsServices
int AddCar(Car car);
And Action In CarsController As
[HttpPost]
[Route("AddCar")]
public IActionResult AddCar(Car car)
{
return new ObjectResult(_icarsService.AddCar(car));
}
And My Model Class For Car Is
using System;
using System.Collections.Generic;
#nullable disable
namespace CAR_RENTAL_SYSTEM.Models
{
public partial class Car
{
public Car()
{
Bookings = new HashSet<Booking>();
CarReviews = new HashSet<CarReview>();
DriverReviews = new HashSet<DriverReview>();
}
public int CarId { get; set; }
public string CarModel { get; set; }
public string CarRtoNumber { get; set; }
public string CarType { get; set; }
public decimal? CarMileage { get; set; }
public int? CarPersonCapacity { get; set; }
public string CarCondition { get; set; }
public decimal? KmDone { get; set; }
public string FuelType { get; set; }
public decimal? RentPerKm { get; set; }
public string ReviewId { get; set; }
public string InService { get; set; }
public virtual ICollection<Booking> Bookings { get; set; }
public virtual ICollection<CarReview> CarReviews { get; set; }
public virtual ICollection<DriverReview> DriverReviews { get; set; }
}
}
The JSON Body Im Sending Through Swagger Is
{
"carId": 0,
"carModel": "Audi",
"carRtoNumber": "MHJK5645",
"carType": "Sedan",
"carMileage": 12,
"carPersonCapacity": 8,
"carCondition": "Good",
"kmDone": 15500,
"fuelType": "Petrol",
"rentPerKm": 25,
"reviewId": "MHJK12",
"inService": "Yes",
"bookings": [
{
"bookingId": 0,
"customerId": 0,
"carId": 0,
"driverId": 0,
"fromDate": "2022-01-07T14:32:48.971Z",
"toDate": "2022-01-07T14:32:48.971Z",
"fromLocation": "string",
"toLocation": "string",
"noOfPersons": 0,
"bookingStatus": "string",
"journeyCompletion": "string",
"paymentStatus": "string",
"createdOn": "2022-01-07T14:32:48.971Z",
"updatedOn": "2022-01-07T14:32:48.971Z",
"customer": {
"customerId": 0,
"customerName": "string",
"customerPassword": "string",
"customerEmail": "string",
"customerPhone": "string",
"customerAdress": "string",
"customerCity": "string",
"customerPin": 0,
"createdOn": "2022-01-07T14:32:48.971Z",
"updatedOn": "2022-01-07T14:32:48.971Z",
"isActive": "string",
"bookings": [
null
],
"carReviews": [
null
],
"driverReviews": [
null
],
"feedbacks": [
{
"feedbackId": 0,
"bookingId": 0,
"customerId": 0,
"feedbackMsg": "string"
}
]
},
"driver": {
"driverId": 0,
"driverName": "string",
"driverLicensenumber": "string",
"driverEmail": "string",
"driverPassword": "string",
"driverPhone": "string",
"driverAddress": "string",
"anyAddiction": "string",
"driverAge": 0,
"reviewId": "string",
"inService": "string",
"isActive": "string",
"bookings": [
null
],
"driverReviews": [
null
],
"journeyCompletions": [
{
"journeyId": 0,
"bookingId": 0,
"driverId": 0,
"kmDone": 0,
"totalFare": 0,
"receipts": [
{
"receiptId": 0,
"bookingId": 0,
"journeyId": 0,
"totalFare": 0,
"paymentStatus": "string"
}
]
}
]
},
"carReviews": [
{
"reviewId": 0,
"carId": 0,
"customerId": 0,
"bookingId": 0,
"review": "string",
"rating": 0,
"customer": {
"customerId": 0,
"customerName": "string",
"customerPassword": "string",
"customerEmail": "string",
"customerPhone": "string",
"customerAdress": "string",
"customerCity": "string",
"customerPin": 0,
"createdOn": "2022-01-07T14:32:48.972Z",
"updatedOn": "2022-01-07T14:32:48.972Z",
"isActive": "string",
"bookings": [
null
],
"carReviews": [
null
],
"driverReviews": [
null
],
"feedbacks": [
{
"feedbackId": 0,
"bookingId": 0,
"customerId": 0,
"feedbackMsg": "string"
}
]
}
}
],
"driverReviews": [
{
"reviewId": 0,
"driverId": 0,
"customerId": 0,
"carId": 0,
"bookingId": 0,
"review": "string",
"rating": 0,
"customer": {
"customerId": 0,
"customerName": "string",
"customerPassword": "string",
"customerEmail": "string",
"customerPhone": "string",
"customerAdress": "string",
"customerCity": "string",
"customerPin": 0,
"createdOn": "2022-01-07T14:32:48.972Z",
"updatedOn": "2022-01-07T14:32:48.972Z",
"isActive": "string",
"bookings": [
null
],
"carReviews": [
null
],
"driverReviews": [
null
],
"feedbacks": [
{
"feedbackId": 0,
"bookingId": 0,
"customerId": 0,
"feedbackMsg": "string"
}
]
},
"driver": {
"driverId": 0,
"driverName": "string",
"driverLicensenumber": "string",
"driverEmail": "string",
"driverPassword": "string",
"driverPhone": "string",
"driverAddress": "string",
"anyAddiction": "string",
"driverAge": 0,
"reviewId": "string",
"inService": "string",
"isActive": "string",
"bookings": [
null
],
"driverReviews": [
null
],
"journeyCompletions": [
{
"journeyId": 0,
"bookingId": 0,
"driverId": 0,
"kmDone": 0,
"totalFare": 0,
"receipts": [
{
"receiptId": 0,
"bookingId": 0,
"journeyId": 0,
"totalFare": 0,
"paymentStatus": "string"
}
]
}
]
}
}
],
"feedbacks": [
{
"feedbackId": 0,
"bookingId": 0,
"customerId": 0,
"feedbackMsg": "string"
}
],
"journeyCompletions": [
{
"journeyId": 0,
"bookingId": 0,
"driverId": 0,
"kmDone": 0,
"totalFare": 0,
"receipts": [
{
"receiptId": 0,
"bookingId": 0,
"journeyId": 0,
"totalFare": 0,
"paymentStatus": "string"
}
]
}
],
"receipts": [
{
"receiptId": 0,
"bookingId": 0,
"journeyId": 0,
"totalFare": 0,
"paymentStatus": "string"
}
]
}
],
"carReviews": [
{
"reviewId": 0,
"carId": 0,
"customerId": 0,
"bookingId": 0,
"review": "string",
"rating": 0,
"customer": {
"customerId": 0,
"customerName": "string",
"customerPassword": "string",
"customerEmail": "string",
"customerPhone": "string",
"customerAdress": "string",
"customerCity": "string",
"customerPin": 0,
"createdOn": "2022-01-07T14:32:48.972Z",
"updatedOn": "2022-01-07T14:32:48.972Z",
"isActive": "string",
"bookings": [
null
],
"carReviews": [
null
],
"driverReviews": [
null
],
"feedbacks": [
{
"feedbackId": 0,
"bookingId": 0,
"customerId": 0,
"feedbackMsg": "string"
}
]
}
}
],
"driverReviews": [
{
"reviewId": 0,
"driverId": 0,
"customerId": 0,
"carId": 0,
"bookingId": 0,
"review": "string",
"rating": 0,
"customer": {
"customerId": 0,
"customerName": "string",
"customerPassword": "string",
"customerEmail": "string",
"customerPhone": "string",
"customerAdress": "string",
"customerCity": "string",
"customerPin": 0,
"createdOn": "2022-01-07T14:32:48.972Z",
"updatedOn": "2022-01-07T14:32:48.972Z",
"isActive": "string",
"bookings": [
null
],
"carReviews": [
null
],
"driverReviews": [
null
],
"feedbacks": [
{
"feedbackId": 0,
"bookingId": 0,
"customerId": 0,
"feedbackMsg": "string"
}
]
},
"driver": {
"driverId": 0,
"driverName": "string",
"driverLicensenumber": "string",
"driverEmail": "string",
"driverPassword": "string",
"driverPhone": "string",
"driverAddress": "string",
"anyAddiction": "string",
"driverAge": 0,
"reviewId": "string",
"inService": "string",
"isActive": "string",
"bookings": [
null
],
"driverReviews": [
null
],
"journeyCompletions": [
{
"journeyId": 0,
"bookingId": 0,
"driverId": 0,
"kmDone": 0,
"totalFare": 0,
"receipts": [
{
"receiptId": 0,
"bookingId": 0,
"journeyId": 0,
"totalFare": 0,
"paymentStatus": "string"
}
]
}
]
}
}
]
}
So After Building This Project I Get Build Succeded And In Swagger When I Try To Add A Car Using Respective JSON Body Following Error Occurs
System.ArgumentNullException: Value cannot be null. (Parameter 'key')
at System.Collections.Generic.Dictionary`2.FindValue(TKey key)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityReferenceMap.TryGet(Object entity, IEntityType entityType, InternalEntityEntry& entry, Boolean throwOnNonUniqueness)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.TryGetEntry(Object entity, IEntityType entityType, Boolean throwOnTypeMismatch)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.NavigationFixer.InitialFixup(InternalEntityEntry entry, Boolean fromQuery)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.NavigationFixer.StateChanged(InternalEntityEntry entry, EntityState oldState, Boolean fromQuery)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.InternalEntityEntryNotifier.StateChanged(InternalEntityEntry entry, EntityState oldState, Boolean fromQuery)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.InternalEntityEntry.FireStateChanged(EntityState oldState)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.InternalEntityEntry.SetEntityState(EntityState oldState, EntityState newState, Boolean acceptChanges, Boolean modifyProperties)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.InternalEntityEntry.SetEntityState(EntityState entityState, Boolean acceptChanges, Boolean modifyProperties, Nullable`1 forceStateWhenUnknownKey)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityGraphAttacher.PaintAction(EntityEntryGraphNode`1 node)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityEntryGraphIterator.TraverseGraph[TState](EntityEntryGraphNode`1 node, Func`2 handleNode)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityEntryGraphIterator.TraverseGraph[TState](EntityEntryGraphNode`1 node, Func`2 handleNode)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityEntryGraphIterator.TraverseGraph[TState](EntityEntryGraphNode`1 node, Func`2 handleNode)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityEntryGraphIterator.TraverseGraph[TState](EntityEntryGraphNode`1 node, Func`2 handleNode)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityGraphAttacher.AttachGraph(InternalEntityEntry rootEntry, EntityState targetState, EntityState storeGeneratedWithKeySetTargetState, Boolean forceStateWhenUnknownKey)
at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.SetEntityState(InternalEntityEntry entry, EntityState entityState)
at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.Add(TEntity entity)
at CAR_RENTAL_SYSTEM.Repositories.CarsRepository.AddCar(Car car) in C:\Users\Sarvesh\source\repos\CAR_RENTAL_SYSTEM\Repositories\CarsRepository.cs:line 15
at CAR_RENTAL_SYSTEM.Services.CarsService.AddCar(Car car) in C:\Users\Sarvesh\source\repos\CAR_RENTAL_SYSTEM\Services\CarsService.cs:line 16
at CAR_RENTAL_SYSTEM.Controllers.CarsController.AddCar(Car car) in C:\Users\Sarvesh\source\repos\CAR_RENTAL_SYSTEM\Controllers\CarsController.cs:line 22
at lambda_method2(Closure , Object , Object[] )
at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
HEADERS
=======
Accept: */*
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9
Connection: close
Content-Length: 5075
Content-Type: application/json
Cookie: ai_user=05ZDd|2021-12-14T10:16:21.921Z; ai_session=zEAqz|1641560256601|1641562776408.5
Host: localhost:44353
Referer: https://localhost:44353/swagger/index.html
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36 Edg/96.0.1054.62
sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="96", "Microsoft Edge";v="96"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "Windows"
origin: https://localhost:44353
sec-fetch-site: same-origin
sec-fetch-mode: cors
sec-fetch-dest: empty
And I Checked Methods and Model there is no issue project build succeeds & Update Method Works For Same Model But Not Add Method
how to solve this error?
Note:This Project Is Created Using DBFirst With Scaffold Command For Generating Models.
1 answers
solution1
1 2022-01-07 18:47:16
Update: Thanks To AchoVasilev, I Removed Id From Json Body, As It was AutoIncrement In Database, And Also The Error Caused By Default Suggested Request Body By Swagger Contained Reference To Other Tables Also.
What I Did: I Used Insomnia As Rest Client And Called Same API Endpoint With Json Body Without CarID[Which Was Identity] & Removed The Other Table References Which results as:
{
"carModel": "CarNameHere",
"carRtoNumber": "DL456560",
"carType": "Sedan",
"carMileage": 18,
"carPersonCapacity": 5,
"carCondition": "Excellent",
"kmDone": 15000,
"fuelType": "Petrol",
"rentPerKm": 20,
"reviewId": "DL4565",
"inService": "Yes"
}
And Sent POST Request And It Has Worked Flawlessely..
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