Question

我有一个用于编辑ApplicationUser对象的页面。这是来自IdentityUser的简单继承，带有一些其他字段。

这些类对各种管理器使用注入，并为表单和处理定义绑定的CurrUser。

public class UserEditModel : CtrackPageModel
{
    private readonly UserManager<ApplicationUser> _userManager;
    private readonly SignInManager<ApplicationUser> _signInManager;
    private readonly RoleManager<ApplicationRole> _roleManager;
    private readonly ApplicationDbContext _db;
    private readonly ILogger<UserEditModel> _logger;

    public UserEditModel(
        ApplicationDbContext db,
        UserManager<ApplicationUser> userManager,
        SignInManager<ApplicationUser> signInManager,
        RoleManager<ApplicationRole> roleManager,
        ILogger<UserEditModel> logger)
    {
        _db = db;
        _userManager = userManager;
        _signInManager = signInManager;
        _roleManager = roleManager;
        _logger = logger;
    }

    [BindProperty]
    public ApplicationUser CurrUser { get; set; }

    public IList<Organisation> Organisations { get; set; }

OnGetAsync仅加载选择列表的值并设置CurrUser

    public async Task<IActionResult> OnGetAsync(string id)
    {
        CurrUser = await _userManager.FindByIdAsync(id);
        Organisations = await _db.Organisations.AsNoTracking().ToListAsync();

        if (CurrUser == null)
        {
            _logger.LogWarning("User not defined. Redirecting to /Admin/Users");
            return RedirectToPage("/Admin/Users");
        }

        return Page();
    }

OnPostEditAsync最初看起来像在工作。调试时，我可以看到CurrUser对象存在并已填充请求的更改。

    public async Task<IActionResult> OnPostEditAsync()
    {
        if (!ModelState.IsValid)
        {
            return Page();
        }

        Organisations = await _db.Organisations.AsNoTracking().ToListAsync();



        try
        {
            _logger.LogInformation("Attempting to update User.");

            IdentityResult result = await _userManager.UpdateAsync(CurrUser);

            if (result == IdentityResult.Success)
            {
                _logger.LogInformation($"Modified User {CurrUser.UserName}");
                AlertInformation($"Modified User {CurrUser.UserName}.");
            }
            else
            {
                _logger.LogInformation($"Error modifying User {CurrUser.UserName}. Result status is {result.ToString()}.");
                AlertError($"Error modifying User {CurrUser.UserName}.  Result status is {result.ToString()}.");
            }
            return Page();

        }
        catch (Exception ex)
        {
            _logger.LogError(ex, $"Error modifying User {CurrUser.UserName}");
            AlertError($"Error modifying User {CurrUser.UserName}. Exception is {ex.GetType()}.");
            if(User.IsInRole("Admin"))
            {
                AlertException(ex);
            }
        }


        return Page();
    }

但是，在进行_userManager.UpdateAsync(CurrUser);调用时，它将引发以下异常

System.InvalidOperationException

无法跟踪实体类型'ApplicationUser'的实例，因为已经跟踪了具有相同键值的{'Id'}的另一个实例。附加现有实体时，请确保仅附加一个具有给定键值的实体实例。考虑使用'DbContextOptionsBuilder.EnableSensitiveDataLogging'查看冲突的键值。

Microsoft.EntityFrameworkCore

在.Net Core 2 Identity中编辑用户时引发异常

0 个答案: