- public partial class Startup
- {
- static Startup()
- {
- UserManagerFactory = () => new UserManager<IdentityUser>(new UserStore<IdentityUser>());
- ....
- }
因此,由于没有DbContext被传递到上面的UserStore构造函数中,这向我指示正在创建新的DbContext.由于我还想利用数据上下文(对于请求期间的其他数据操作),我稍微更改了模板代码:
- public partial class Startup
- {
- public static DerivedDbContext=null;
- static Startup()
- {
- context = new DerivedDbContext();
- UserManagerFactory = () => new UserManager<IdentityUser>(new UserStore<IdentityUser>(context));
- ...
- }
现在,我可以通过以下方式从我的任何控制器使用相同的DbContext:
- Startup.context
但是,当多个请求同时进入时我遇到了麻烦,因为无关的操作发生在同一个DbContext中.从这里开始,我向我指出,我不应该在应用程序的整个生命周期中实例化单个DbContext,而只是为了特定请求的生命周期,所以我将实例化移动到控制器的构造函数,但是现在,我在控制器中有自己的DbContext,而UserManager仍然有自己的(并且在Startup类中创建).
为什么模板为所有用户(在Startup类中)实例化了一次UserManager?值得关注的是,通过在控制器构造函数中创建自己的DbContext,有两个DbContexts(我在控制器的构造函数中创建的那个,以及在UserManager中创建的那个,在Startup类中创建的)同时播放?在所有请求中共享一个UserManager是否可以接受,但是在一般情况下在所有请求中共享一个DbContext是不可接受的?
有两个单独的上下文似乎是愚蠢的,我注意到我有时会得到一个不同步的数据视图.我想知道是否有其他人在使用此模板时遇到此问题.
**编辑:我理解像nInject这样的IOC框架可能有助于在这种情况下管理对象生命周期,但我想首先了解如何在没有这种框架的帮助下实现这一目标.
谢谢…
-ben
解决方法
我们正在开发一个更新的样本包来演示这些,但与此同时
您可以使用新软件包添加以下IdentityModels.cs / Startup.Auth.cs:
- public class ApplicationUser : IdentityUser
- {
- public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> 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 ApplicationDbContext : IdentityDbContext<ApplicationUser>
- {
- public ApplicationDbContext()
- : base("DefaultConnection")
- {
- }
- public static ApplicationDbContext Create() {
- return new ApplicationDbContext();
- }
- }
- public class ApplicationUserManager : UserManager<ApplicationUser> {
- // Configure the application user manager
- public ApplicationUserManager(IUserStore<ApplicationUser> store) : base(store) {
- }
- public static ApplicationUserManager Create(IdentityFactoryOptions<ApplicationUserManager> options) {
- var manager = new ApplicationUserManager(new UserStore<ApplicationUser>(options.Context.GetDbContext()));
- //var manager = new ApplicationUserManager(new AzureStore<ApplicationUser>());
- manager.UserValidator = new UserValidator<ApplicationUser>(manager) {
- AllowOnlyAlphanumericUserNames = false,RequireUniqueEmail = true
- };
- manager.PasswordValidator = new MinimumLengthValidator(6);
- var dataProtectionProvider = options.DataProtectionProvider;
- if (dataProtectionProvider != null) {
- manager.PasswordResetTokens = new DataProtectorTokenProvider(dataProtectionProvider.Create("PasswordReset"));
- manager.UserConfirmationTokens = new DataProtectorTokenProvider(dataProtectionProvider.Create("ConfirmUser"));
- }
- return manager;
- }
- }
- public static class OwinExtensions {
- public static IAppBuilder UseDbContextFactory(this IAppBuilder app,Func<DbContext> createCallback) {
- if (app == null) {
- throw new ArgumentNullException("app");
- }
- if (createCallback == null) {
- throw new ArgumentNullException("createCallback");
- }
- app.Use(typeof(IdentityFactoryMiddleware<DbContext,IdentityFactoryOptions<DbContext>>),new IdentityFactoryOptions<DbContext>() {
- Provider = new IdentityFactoryProvider<DbContext>() {
- OnCreate = (options) => createCallback()
- }
- });
- return app;
- }
- public static DbContext GetDbContext(this IOwinContext context) {
- if (context == null) {
- throw new ArgumentNullException("context");
- }
- return context.Get<DbContext>();
- }
- }
以下内容进入Startup.Auth.cs:
- public void ConfigureAuth(IAppBuilder app) {
- // Configure the db context and user manager to use per request
- app.UseDbContextFactory(ApplicationDbContext.Create);
- app.UseUserManagerFactory(new IdentityFactoryOptions<ApplicationUserManager>() {
- DataProtectionProvider = app.GetDataProtectionProvider(),Provider = new IdentityFactoryProvider<ApplicationUserManager>() {
- OnCreate = ApplicationUserManager.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 {
- OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager,ApplicationUser>(
- validateInterval: TimeSpan.FromSeconds(5),regenerateIdentity: (manager,user) => user.GenerateUserIdentityAsync(manager))
- }
- });
- app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);