c# - 值不能为空 - 应用程序管理器

Question

我正在更改 ASP.NET MVC 站点的新启动文件中的一些内容，但出现空错误:

System.ArgumentNullException: Value cannot be null. Parameter name: context

身份配置文件:

使用-

using Microsoft.AspNet.Identity.Owin;
using Microsoft.AspNet.Identity;

...剪断...

public static ApplicationUserManager Create(IdentityFactoryOptions<ApplicationUserManager> options, IOwinContext context) 
{
    var manager = new ApplicationUserManager(new UserStore<ApplicationUser>(context.Get<IdentityDb>()));
    // Configure validation logic for usernames
    manager.UserValidator = new UserValidator<ApplicationUser>(manager)
    {
        AllowOnlyAlphanumericUserNames = false,
        RequireUniqueEmail = true
    };

IdentityDb 文件:

public class IdentityDb : IdentityDbContext<ApplicationUser>
{
    public IdentityDb()
        : base("DefaultConnection")
    {
    }
}

我不知道我是否遗漏了 Microsoft.AspNet.Identity.Owin.IdentityFactoryProvider 的某些内容？

Server Error in '/' Application.

值不能为空。 参数名称:context

描述:当前网络请求执行过程中出现未处理的异常。请查看堆栈跟踪以获取有关错误及其在代码中的来源的更多信息。

异常详细信息:System.ArgumentNullException:值不能为空。

参数名称:context

完整的堆栈跟踪:

Source Error: 


Line 40:         public static ApplicationUserManager Create(IdentityFactoryOptions<ApplicationUserManager> options, IOwinContext context)
Line 41:         {
Line 42:             var manager = new ApplicationUserManager(new UserStore<ApplicationUser>(context.Get<IdentityDb>()));
Line 43:             // Configure validation logic for usernames
Line 44:             manager.UserValidator = new UserValidator<ApplicationUser>(manager)

Source File: c:\users\aindriu\documents\visual studio 2015\Projects\Books\Books.Web\App_Start\IdentityConfig.cs    Line: 42 

Stack Trace: 


[ArgumentNullException: Value cannot be null.
Parameter name: context]
   Microsoft.AspNet.Identity.EntityFramework.UserStore`6..ctor(DbContext context) +335
   Microsoft.AspNet.Identity.EntityFramework.UserStore`1..ctor(DbContext context) +5
   Books.Web.ApplicationUserManager.Create(IdentityFactoryOptions`1 options, IOwinContext context) in c:\users\aindriu\documents\visual studio 2015\Projects\Books\Books.Web\App_Start\IdentityConfig.cs:42
   Microsoft.AspNet.Identity.Owin.IdentityFactoryProvider`1.Create(IdentityFactoryOptions`1 options, IOwinContext context) +14
   Microsoft.AspNet.Identity.Owin.<Invoke>d__0.MoveNext() +104
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.<RunApp>d__5.MoveNext() +187
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.<DoFinalWork>d__2.MoveNext() +185
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.StageAsyncResult.End(IAsyncResult ar) +69
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContext.EndFinalWork(IAsyncResult ar) +64
   System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +380
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

Answer 1

为了解决这个问题，我将 app.CreatePerOwinContext(ApplicationDbContext.Create); 添加到 Startup.Auth.cs 中的 ConfigureAuth()/p>

启动.Auth.cs

public partial class Startup
{
    // For more information on configuring authentication, please visit http://go.microsoft.com/fwlink/?LinkId=301864
    public void ConfigureAuth(IAppBuilder app)
    {
        // Configure the db context, user manager and signin manager to use a single instance per request
        app.CreatePerOwinContext(ApplicationDbContext.Create);
        app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
        app.CreatePerOwinContext<ApplicationSignInManager>(ApplicationSignInManager.Create);

        // Enable the application to use a cookie to store information for the signed in user
        // and to use a cookie to temporarily store information about a user logging in with a third party login provider
        // Configure the sign in cookie
        app.UseCookieAuthentication(new CookieAuthenticationOptions
        {
            AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
            LoginPath = new PathString("/Account/Login"),
            Provider = new CookieAuthenticationProvider
            {
                // Enables the application to validate the security stamp when the user logs in.
                // This is a security feature which is used when you change a password or add an external login to your account.  
                OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager, ApplicationUser>(
                    validateInterval: TimeSpan.FromMinutes(30),
                    regenerateIdentity: (manager, user) => user.GenerateUserIdentityAsync(manager))
            }
        });            
        app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);

        // Enables the application to temporarily store user information when they are verifying the second factor in the two-factor authentication process.
        app.UseTwoFactorSignInCookie(DefaultAuthenticationTypes.TwoFactorCookie, TimeSpan.FromMinutes(5));

        // Enables the application to remember the second login verification factor such as phone or email.
        // Once you check this option, your second step of verification during the login process will be remembered on the device where you logged in from.
        // This is similar to the RememberMe option when you log in.
        app.UseTwoFactorRememberBrowserCookie(DefaultAuthenticationTypes.TwoFactorRememberBrowserCookie);

        // Uncomment the following lines to enable logging in with third party login providers
        //app.UseMicrosoftAccountAuthentication(
        //    clientId: "",
        //    clientSecret: "");

        //app.UseTwitterAuthentication(
        //   consumerKey: "",
        //   consumerSecret: "");

        //app.UseFacebookAuthentication(
        //   appId: "",
        //   appSecret: "");

        //app.UseGoogleAuthentication(new GoogleOAuth2AuthenticationOptions()
        //{
        //    ClientId = "",
        //    ClientSecret = ""
        //});
    }
}