如何在 ASP.NET web 应用程序之外获取 UserManager 实例？

Question

我有一个带有ASP.NET Identity（个人账户）的ASP.NET MVC 5 Web应用程序。但我需要能够从控制台应用程序注册新用户。

因此，我正在将一些ASP.NET Identity类从Web应用程序移动到共享Web应用程序和CLI之间的类库中。

我已成功地移动了以下内容：

public class PortalDbContext : IdentityDbContext<PortalUser>
{
    public PortalDbContext(string connectionString)
        : base(connectionString, throwIfV1Schema: false)
    {
    }

    public static PortalDbContext Create(string connectionString)
    {
        return new PortalDbContext(connectionString);
    }
}

public class PortalUser : IdentityUser
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<PortalUser> manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);

        // Add custom user claims here
        return userIdentity;
    }
}

public class PortalUserManager : UserManager<PortalUser>
{
    public PortalUserManager(IUserStore<PortalUser> store) : base(store)
    {
    }

    public async Task<IdentityResult> RegisterUser(string email, string password)
    {
        PortalUser user = new PortalUser { UserName = email, Email = email };

        return await this.CreateAsync(user, password);
    }
}

但是我不知道从哪里获取 IUserStore<PortalUser>，PortalUserManager 需要它来工作。

在 Web 应用程序中，可以通过 HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>() 获取此管理器，但在类库中显然无法使用。

- empz

Answer 1

请看 OwinRequestScopeContext nuget 包。它允许您使用上下文，而不依赖于 System.Web。为了避免只有链接的答案，我将添加当前自述文件中的示例：

# Usage 

// using Owin; you can use UseRequestScopeContext extension method.

// enabled timing is according to Pipeline.
// so I recommend enable as far in advance as possible.
app.UseRequestScopeContext();

app.UseErrorPage();
app.Run(async _ =>
{
    // get global context like HttpContext.Current.
    var context = OwinRequestScopeContext.Current;

    // Environment is raw Owin Environment as IDictionary<string, object>.
    var __ = context.Environment;

    // optional:If you want to change Microsoft.Owin.OwinContext, you can wrap.
    new Microsoft.Owin.OwinContext(context.Environment);

    // Timestamp is request started(correctly called RequestScopeContextMiddleware timing).
    var ___ = context.Timestamp;

    // Items is IDictionary<string, object> like HttpContext.Items.
    // Items is threadsafe(as ConcurrentDictionary) by default.
    var ____ = context.Items;

    // DisposeOnPipelineCompleted can register dispose when request completed(correctly RequestScopeContextMiddleware underling Middlewares finished)
    // return value is cancelToken. If call token.Dispose() then canceled register.
    var cancelToken = context.DisposeOnPipelineCompleted(new TraceDisposable());

    // OwinRequestScopeContext over async/await also ConfigureAwait(false)
    context.Items["test"] = "foo";
    await Task.Delay(TimeSpan.FromSeconds(1)).ConfigureAwait(false);
    var _____ = OwinRequestScopeContext.Current.Items["test"]; // foo

    await Task.Run(() =>
    {
        // OwinRequestScopeContext over new thread/threadpool.
        var ______ = OwinRequestScopeContext.Current.Items["test"]; // foo
    });

    _.Response.ContentType = "text/plain";
    await _.Response.WriteAsync("Hello OwinRequestScopeContext! => ");
    await _.Response.WriteAsync(OwinRequestScopeContext.Current.Items["test"] as string); // render foo
});

- John H

---

这似乎对我所需的过于复杂了。我只是想知道如何实例化一个UserStore。 - empz

Answer 2

我最终添加了一个静态方法Create(string connectionString)到PortalUserManager中，该方法将创建UserStore和DbContext，并返回管理器的一个新实例。

public class PortalDbContext : IdentityDbContext<PortalUser>
{
    public PortalDbContext(string connectionString)
        : base(connectionString, throwIfV1Schema: false)
    {
    }

    public static PortalDbContext Create(string connectionString)
    {
        return new PortalDbContext(connectionString);
    }
}

public class PortalUser : IdentityUser
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<PortalUser> manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);

        // Add custom user claims here
        return userIdentity;
    }
}

public class PortalUserManager : UserManager<PortalUser>
{
    public PortalUserManager(IUserStore<PortalUser> store) : base(store)
    {
    }

    public static PortalUserManager Create(string connectionString)
    {
        UserStore<PortalUser> userStore = new UserStore<PortalUser>(PortalDbContext.Create(connectionString));

        PortalUserManager manager = new PortalUserManager(userStore);

        // Configure validation logic for usernames
        manager.UserValidator = new UserValidator<PortalUser>(manager)
        {
            AllowOnlyAlphanumericUserNames = true,
            RequireUniqueEmail = true                
        };

        // Configure validation logic for passwords
        manager.PasswordValidator = new PasswordValidator
        {
            RequiredLength = 6,
            RequireNonLetterOrDigit = true,
            RequireDigit = true,
            RequireLowercase = true,
            RequireUppercase = true,
        };

        return manager;
    }

    public async Task<IdentityResult> RegisterUser(string email, string password)
    {
        PortalUser user = new PortalUser { UserName = email, Email = email };

        return await this.CreateAsync(user, password);
    }
}

- empz