我遇到了这个错误
System.ObjectDisposedException
HResult=0x80131622
Message=Cannot access a disposed object. A common cause of this error is disposing a context that was resolved from dependency injection and then later trying to use the same context instance elsewhere in your application. This may occur if you are calling Dispose() on the context, or wrapping the context in a using statement. If you are using dependency injection, you should let the dependency injection container take care of disposing context instances.
Source=Microsoft.EntityFrameworkCore
StackTrace:
at Microsoft.EntityFrameworkCore.Internal.ConcurrencyDetector.AsyncDisposer.Dispose()
at Microsoft.EntityFrameworkCore.Query.Internal.AsyncLinqOperatorProvider.ExceptionInterceptor`1.EnumeratorExceptionInterceptor.<MoveNext>d__5.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.<ExecuteSingletonAsyncQuery>d__21`1.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Microsoft.AspNetCore.Identity.UserManager`1.<FindByNameAsync>d__78.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Microsoft.AspNetCore.Identity.UserValidator`1.<ValidateUserName>d__6.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.AspNetCore.Identity.UserValidator`1.<ValidateAsync>d__5.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Microsoft.AspNetCore.Identity.UserManager`1.<ValidateUserAsync>d__172.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Microsoft.AspNetCore.Identity.UserManager`1.<CreateAsync>d__74.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Microsoft.AspNetCore.Identity.UserManager`1.<CreateAsync>d__79.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at EmployeeController.<Create>d__3.MoveNext() in Controllers\EmployeeController.cs:line 31
以下是需要翻译的代码:
public class EmployeeController : Controller
{
private readonly UserManager<Employee> userManager;
public EmployeeController(UserManager<Employee> userManager)
{
this.userManager = userManager;
}
public ActionResult<string> Get()
{
return "Test Employee";
}
[HttpPost("Create")]
public async void Create([FromBody]string employee)
{
var user = new Employee { UserName = "test@gmail.com", Email = "test@gmail.com" };
var d = await userManager.CreateAsync(user, "1234567");
}
}
Startup.cs
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddDbContext<ApplicationDbContext>(options =>
options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
services.AddIdentity<Employee, IdentityRole>(opts =>
{
opts.Password.RequireDigit = false;
opts.Password.RequireLowercase = false;
opts.Password.RequireUppercase = false;
opts.Password.RequireNonAlphanumeric = false;
opts.Password.RequiredLength = 7;
opts.User.RequireUniqueEmail = true;
}).AddEntityFrameworkStores<ApplicationDbContext>().AddDefaultTokenProviders();
services.AddAuthentication(opts =>
{
opts.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
opts.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
opts.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
}).AddJwtBearer(cfg =>
{
cfg.RequireHttpsMetadata = false;
cfg.SaveToken = true;
cfg.TokenValidationParameters = new TokenValidationParameters()
{
// standard configuration
ValidIssuer = Configuration["Auth:Jwt:Issuer"],
ValidAudience = Configuration["Auth:Jwt:Audience"],
IssuerSigningKey = new SymmetricSecurityKey(
Encoding.UTF8.GetBytes(Configuration["Auth:Jwt:Key"])),
ClockSkew = TimeSpan.Zero,
// security switches
RequireExpirationTime = true,
ValidateIssuer = true,
ValidateIssuerSigningKey = true,
ValidateAudience = true
};
});
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseAuthentication();
app.UseMvc();
}
}
我需要在我的DI中注册一些东西吗? 我的理解是AddEntityFrameworkStores<ApplicationDbContext>()
就足够了。
async void
是合法的,但是非常危险。 - Camilo Terevinto