我正在尝试使用 UserManager<TUser> 更新用户但出现以下错误
The instance of entity type 'UserEntity' cannot be tracked because another instance with the key value '{Id}' is already being tracked. When attaching existing entities, ensure that only one entity instance with a given key value is attached.
互联网上有几个关于上述错误的问题，但在通过 UserManager 更新用户时没有一个问题.
这是我的代码:
服务配置:
services.AddScoped<IUserRepository, UserRepository>();
services.AddIdentity<UserEntity, UserRoleEntity>()
.AddEntityFrameworkStores<GallaContext>()
.AddDefaultTokenProviders();
用户实体:
public class UserEntity : IdentityUser<Guid>
{
private ProfileEntity _profile;
private UserEntity(ILazyLoader lazyLoader)
{
LazyLoader = lazyLoader;
}
private ILazyLoader LazyLoader { get; set; }
public UserEntity()
{
}
public string FirstName { get; set; }
public string LastName { get; set; }
public string Designation { get; set; }
public string IdentityNumber { get; set; }
public bool Active { get; set; }
public DateTimeOffset CreatedAt { get; set; }
public string CreatedBy { get; set; }
public DateTimeOffset? ModifiedAt { get; set; }
public string ModifiedBy { get; set; }
public Guid ProfileId { get; set; }
public ProfileEntity Profile { get => LazyLoader.Load(this, ref _profile); set => _profile = value; }
}
Razor 页面处理程序:
public async Task<IActionResult> OnPutAsync(
[FromForm] UserViewModel userViewModel,
CancellationToken ct)
{
try
{
await _user.InitializeAsync(userViewModel.Id, ct);
var user = _mapper.Map(userViewModel, _user);
var result = await user.SaveAsync(ct);
return new JsonResult(new AjaxResultHelper<string>(result.Succeeded)
{
Response = result.ErrorMessage ?? ResponseMessages.DataSaved
});
}
catch (Exception e)
{
// Need to log the error
return new JsonResult(new AjaxResultHelper<string>()
{
Response = e.Message
});
}
}
用户业务:
public class User : CoreEntityBase
{
private readonly IUserRepository _userRepository;
private readonly IMapper _mapper;
public User(
IUserRepository userRepository,
IMapper mapper)
{
_userRepository = userRepository;
_mapper = mapper;
}
public string Name => $"{FirstName} {LastName}";
public string UserName { get; private set; }
public string NormalizedUserName { get; private set; }
public string Email { get; private set; }
public string NormalizedEmail { get; private set; }
public bool EmailConfirmed { get; private set; }
public string PasswordHash { get; private set; }
public string SecurityStamp { get; private set; }
public string ConcurrencyStamp { get; private set; }
public bool LockoutEnabled { get; private set; }
[Sortable(Default = true)]
[SearchableString]
public string FirstName { get; set; }
[Sortable]
[SearchableString]
public string LastName { get; set; }
[Sortable]
[SearchableString]
public string Designation { get; set; }
[Sortable]
[SearchableString]
public string IdentityNumber { get; set; }
public Guid ProfileId { get; set; }
[NestedSortable]
[NestedSearchable]
public Profile Profile { get; set; }
public async Task InitializeAsync(
Guid Id,
CancellationToken ct)
{
if (Id == null)
{
throw new ArgumentNullException($"{nameof(Id)} cannot be null");
}
var user = await _userRepository.GetUserByIdAsync(Id, ct);
_mapper.Map(user, this);
SecurityStamp = user.SecurityStamp;
UserName = user.UserName;
}
public async Task<User> GetUserByIdAsync(
Guid userId,
CancellationToken ct)
{
var user = await _userRepository.GetUserByIdAsync(userId, ct);
return _mapper.Map<User>(user);
}
public async Task<(bool Succeeded, string ErrorMessage)> SaveAsync(CancellationToken ct)
{
if (!Validate())
{
return (false, Errors?.First());
}
//var userEntity = await _userRepository.GetUserByIdAsync(Id, ct);
//var userEntity = _mapper.Map(this, userEntity);
var update = await _userRepository.UpdateUserAsync(this);
return update;
}
public override bool Validate()
{
var isValid = true;
if (string.IsNullOrWhiteSpace(FirstName))
{
Errors.Add("FirstName cannot be empty");
isValid = false;
}
if (string.IsNullOrWhiteSpace(LastName))
{
Errors.Add("LastName cannot be empty");
isValid = false;
}
if (string.IsNullOrWhiteSpace(Designation))
{
Errors.Add("Designation cannot be empty");
isValid = false;
}
return isValid;
}
}
用户资料库:
public class UserRepository : IUserRepository
{
private readonly UserManager<UserEntity> _userManager;
private readonly IMapper _mapper;
public UserRepository(
UserManager<UserEntity> userManager,
IMapper mapper)
{
_userManager = userManager;
_mapper = mapper;
}
public async Task<UserEntity> GetUserByIdAsync(
Guid userId,
CancellationToken ct)
{
var entity = await _userManager.Users.AsNoTracking().TagWith(nameof(GetUserIdAsync))
.Include(u => u.Profile)
.SingleOrDefaultAsync(x => x.Id == userId, ct);
return entity;
}
public async Task<(bool Succeeded, string ErrorMessage)> UpdateUserAsync(User user)
{
var userEntity = _mapper.Map<UserEntity>(user);
var result = await _userManager.UpdateAsync(userEntity);
if (result.Succeeded)
{
return (true, null);
}
var firstError = result.Errors.FirstOrDefault()?.Description;
return (false, firstError);
}
}
我不知道我哪里错了。我有AsNoTracking()设置为 _userManager.Users在 GetUserByIdAsync()方法;但仍然无法正常工作并继续抛出相同的错误。我做错了吗？请协助指出需要更正的地方以及我哪里出错了。
提前致谢。
最佳答案
经过一些分析找出了问题所在。这是因为 GetUserByIdAsync()。虽然我将 AsNoTracking() 设置为 _userManager.Users，但它在内部由 ef core 跟踪。因此，通过 _userManager.FindByIdAsync 更改了实现以返回用户，并且成功了。
这是最终清理过的代码。希望这对某人有帮助。
Razor 页面处理程序:
public async Task<IActionResult> OnPutAsync([FromForm] UserViewModel userViewModel)
{
try
{
await _user.InitializeAsync(userViewModel.Id);
var user = _mapper.Map(userViewModel, _user);
var (Succeeded, ErrorMessage) = await user.SaveAsync();
return new JsonResult(new AjaxResultHelper<string>(Succeeded)
{
Response = ErrorMessage ?? ResponseMessages.DataSaved
});
}
catch (Exception ex)
{
// Need to log the error
Console.WriteLine(ex.Message);
return new JsonResult(new AjaxResultHelper<string>()
{
Response = ResponseMessages.DataNotSaved
});
}
}
用户业务:
public class User : CoreEntityBase
{
private readonly IUserRepository _userRepository;
private readonly IMapper _mapper;
public User()
{
}
public User(
IUserRepository userRepository,
IMapper mapper)
{
_userRepository = userRepository;
_mapper = mapper;
}
public string Name { get; set; }
[Sortable(Default = true)]
[SearchableString]
public string FirstName { get; set; }
[Sortable]
[SearchableString]
public string LastName { get; set; }
[Sortable]
[SearchableString]
public string Designation { get; set; }
[Sortable]
[SearchableString]
public string IdentityNumber { get; set; }
public Guid ProfileId { get; set; }
[NestedSortable]
[NestedSearchable]
public Profile Profile { get; set; }
public async Task InitializeAsync(Guid Id)
{
if (Id == null)
{
throw new ArgumentNullException($"{nameof(Id)} cannot be null");
}
var userEntity = await _userRepository.GetUserByIdAsync(Id);
_mapper.Map(userEntity, this);
}
public async Task<PagedResults<User>> GetUsersAsync(
PagingOptions pagingOptions,
SortOptions<User, UserEntity> sortOptions,
SearchOptions<User, UserEntity> searchOptions,
CancellationToken ct)
{
var users = await _userRepository.GetUsersAsync(pagingOptions, sortOptions, searchOptions, ct);
return new PagedResults<User>
{
Items = _mapper.Map<User[]>(users.Items),
TotalSize = users.TotalSize
};
}
public async Task<User> GetUserByIdAsync(Guid userId)
{
var userEntity = await _userRepository.GetUserByIdAsync(userId);
return _mapper.Map<User>(userEntity);
}
public async Task<(bool Succeeded, string ErrorMessage)> SaveAsync()
{
if (!Validate())
{
return (false, Error);
}
var userEntity = await _userRepository.GetUserByIdAsync(Id);
userEntity = _mapper.Map(this, userEntity);
var update = await _userRepository.UpdateUserAsync(userEntity);
return update;
}
public override bool Validate()
{
var isValid = true;
if (string.IsNullOrWhiteSpace(FirstName))
{
Error = "FirstName cannot be empty";
isValid = false;
}
if (string.IsNullOrWhiteSpace(LastName))
{
Error = "LastName cannot be empty";
isValid = false;
}
if (string.IsNullOrWhiteSpace(Designation))
{
Error = "Designation cannot be empty";
isValid = false;
}
return isValid;
}
}
用户存储库:
public class UserRepository : IUserRepository
{
private readonly UserManager<UserEntity> _userManager;
public UserRepository(
UserManager<UserEntity> userManager)
{
_userManager = userManager;
}
public async Task<UserEntity> GetUserByIdAsync(Guid userId)
{
var entity = await _userManager.FindByIdAsync(userId.ToString());
return entity;
}
public async Task<(bool Succeeded, string ErrorMessage)> UpdateUserAsync(UserEntity userEntity)
{
var result = await _userManager.UpdateAsync(userEntity);
if (result.Succeeded)
{
return (true, null);
}
var firstError = result.Errors.FirstOrDefault()?.Description;
return (false, firstError);
}
}
关于c# - 无法在 asp.net core 2.2 应用程序中使用 ef core 2.2 通过 UserManager<TUser> 更新用户，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57398092/