Question

当我在这个控制器的构造函数中设置断点时，我看到来自userManager.Users的System.ObjectDisposedException。为什么.NET会给我一个处理过的UserManager？我有其他控制器似乎以相同的方式设置，他们的UserManagers工作正常（这一个在它调用GetUserAsync时死亡）

[RequireHttps]
public class HomeController : Controller
{
    private readonly UserManager<ApplicationUser> _userManager;
    private readonly RegionService _regionService;
    private readonly ILogger _logger;

    public HomeController(UserManager<ApplicationUser> userManager, RegionService regionService, ILoggerFactory loggerFactory)
    {
        _userManager = userManager;
        _regionService = regionService;
        _logger = loggerFactory.CreateLogger<HomeController>();
    }

    [HttpGet]
    public async Task<IActionResult> Index()
    {
        var user = await _userManager.GetUserAsync(HttpContext.User);

        ...
    }

...我不应该访问Home / Index中的数据库;之后我会改变它

编辑： 这就是配置服务的方式：

public void ConfigureServices(IServiceCollection services)
    {
        // Add framework services.
        services.AddApplicationInsightsTelemetry(Configuration);

        services.AddDbContext<ApplicationDbContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

        services.AddIdentity<ApplicationUser, IdentityRole>(options =>
        {
            options.Password.RequireDigit = true;
            options.Password.RequireLowercase = false;
            options.Password.RequireNonAlphanumeric = false;
            options.Password.RequireUppercase = false;
            options.Password.RequiredLength = 6;
        })
            .AddEntityFrameworkStores<ApplicationDbContext>()
            .AddDefaultTokenProviders();

        services.AddMvc();

        // Add application services.
        services.AddTransient<IEmailSender, AuthMessageSender>();
        services.AddTransient<ISmsSender, AuthMessageSender>();
        services.Configure<AuthMessageSenderOptions>(Configuration);
        services.AddTransient<RegionService>();

        // require SSL
        services.Configure<MvcOptions>(options =>
        {
            options.Filters.Add(new RequireHttpsAttribute());
        });
    }

Answer 1

问题出在我创建的一个名为RegionService

的类的构造函数中

    public RegionService(IServiceProvider serviceProvider)
    {
        using (var context = serviceProvider.GetService<ApplicationDbContext>())
        {
             ...
        }
    }

使用＆＃39;声明原因＆＃39; context＆＃39;在完成该代码块之后处理。我应该刚刚制作了一个可以处理的DbContext的新实例：

public RegionService(IServiceProvider serviceProvider)
    {
        using (var context = new ApplicationDbContext(
            serviceProvider.GetRequiredService<DbContextOptions<ApplicationDbContext>>()))
        {
            ...
        }
    }

为什么我的Controller被传递给Disposed的UserManager？

1 个答案: