更新方法 - 值不能是 null。 （參數“實體”）

Question

我有一個我無法解決的問題。 當我嘗試更新數據庫中名為“簡介”的字段時，我從 API 收到此消息：

System.ArgumentNullException：值不能為 null。 （參數“實體”）在 Microsoft.EntityFrameworkCore.Utilities.Check.NotNull[T]（T 值，字符串參數名稱）在 Microsoft.EntityFrameworkCore.DbContext.Entry[TEntity]（TEntity 實體）在 ClinicAPIv1.Data.UserRepository.Update（ ClinicUser ClinicUser) 在 E:\Users\User\Desktop\Clinic\ClinicAPIv1\ClinicAPIv1\Data\UserRepository.cs:line 61 at ClinicAPIv1.Controllers.UsersController.UpdateDoctor(DoctorUpdateDTO doctorUpdateDTO) 在 E:\Users\User\Desktop\Clinic \ClinicAPIv1\ClinicAPIv1\Controllers\UsersController.cs:line 74 at lambda_method34(Closure, Object ) at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments) at Microsoft.AspNetCore.Mvc.Infrastructure.Co 的 Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Logged|12_1(ControllerActionInvoker 調用程序) ntrollerActionInvoker.g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) 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.g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft 。作為 pNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Logged|17_1(ResourceInvoker invoker) at Microsoft .AspNetCore.Routing.EndpointMiddleware.g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger) 在 Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context) 在 Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) 在 ClinicAPIv1 .Middleware.ExceptionMiddleware.InvokeAsync(HttpContext context) 在 E:\Users\User\Desktop\Clinic\ClinicAPIv1\ClinicAPIv1\Middleware\ExceptionMiddleware.cs:line 30

我知道問題出在我的存儲庫中的更新 function 上：

public void Update(ClinicUser clinicUser)
    {
        _context.Entry(clinicUser).State = EntityState.Modified;
    }

第 61 行是

_context.Entry(clinicUser).State = EntityState.Modified;

Controller Put 方法如下所示：

   [HttpPut]
public async Task<ActionResult> UpdateDoctor(DoctorUpdateDTO doctorUpdateDTO)
    {
        var email = User.FindFirst(ClaimTypes.Name)?.Value;
        var user = await _userRepository.GetUserByEmail(email);

        _mapper.Map(doctorUpdateDTO, user);

        _userRepository.Update(user);

        if (await _userRepository.SaveAllAsync()) return NoContent();

        return BadRequest("Failed to update Doctor Profile :(");
    }

第 74 行是

_userRepository.Update(user);

醫生更新DTO：

public class DoctorUpdateDTO
{
    public string Introduction { get; set; }
}

映射器：

public class AutoMapperProfiles : Profile
{
    public AutoMapperProfiles()
    {
        CreateMap<ClinicUser, MemberDTO>()
            .ForMember(dest => dest.PhotoUrl, opt => opt.MapFrom(
                src => src.Photos.FirstOrDefault().Url));
        CreateMap<Photo, PhotoDTO>();
        CreateMap<DoctorUpdateDTO, ClinicUser>();
    }
}

通過電子郵件獲取用戶：

public async Task<ClinicUser> GetUserByEmail(string email)
    {
        return await _context.clinicUsers
            .Where(x => x.TemporaryRole == "Doctor")
            .Include(p => p.Photos)
            .SingleOrDefaultAsync(x => x.Email == email);
    }

請幫我解決問題

Answer 1

在 AutoMapperProfiles 中調用 CreateMap 之后鏈 ReverseMap。 在此處獲取更多信息。