Asp.net core - 没有这样的表：AspNetUsers

所以我试图为我的 asp.net core 应用程序实现用户登录。我正在关注微软教程here https://docs.asp.net/en/latest/security/authentication/identity.html。我有两个上下文，一个称为 SchoolContext，用于保存所有与学校相关的模型，另一个称为 ApplicationDbContext，用于保存帐户模型。这一切都被保存到 sqlite 数据库中。
一切正常，直到我尝试将用户注册到我的上下文中。当我尝试注册用户时，出现找不到 AspNetUsers 表错误。如果我查看数据库，我看不到 AspNetUser 表。我尝试添加迁移 https://docs.asp.net/en/latest/data/ef-mvc/migrations.html，但我仍然遇到同样的错误。为什么没有创建表？

启动.cs

public class Startup {
        public IConfigurationRoot Configuration { get; }
        public Startup(IHostingEnvironment env) {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();
            Configuration = builder.Build();
        }
        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services) {
            // Add Context services
            services.AddDbContext<SchoolContext>(options =>
                options.UseSqlite(Configuration.GetConnectionString("MainConnection")));
            services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlite(Configuration.GetConnectionString("MainConnection")));

            // Add Identify servies 
            services.AddIdentity<ApplicationUser, IdentityRole>()
                .AddEntityFrameworkStores<ApplicationDbContext>()
                .AddDefaultTokenProviders();
            // Add framework services
            services.AddMvc();
        }
        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, SchoolContext context) {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();
            // Config hot module replacement
            if (env.IsDevelopment()) {
                app.UseDeveloperExceptionPage();
                app.UseWebpackDevMiddleware(new WebpackDevMiddlewareOptions {
                    HotModuleReplacement = true
                });
            }
            else {
                app.UseExceptionHandler("/Home/Error");
            }
            app.UseStaticFiles();
            // Enabled Identity
            app.UseIdentity();
            // Confgure routes 
            app.UseMvc(routes => {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");

                routes.MapSpaFallbackRoute(
                    name: "spa-fallback",
                    defaults: new { controller = "Home", action = "Index" });
            });
            // Initialize school database [FOR TESTING] 
            DbInitializer.Initialize(context);
        }
    }

应用程序DbContext.cs

namespace ContosoUniversity.Data
{
    public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options): base(options)
        {
        }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            base.OnModelCreating(builder);
        }
    }
}

应用程序用户.cs

namespace ContosoUniversity.Models
{
    // Add profile data for application users by adding properties to the ApplicationUser class
    public class ApplicationUser : IdentityUser
    {
    }
}

应用程序设置.json

  "ConnectionStrings": {
    "MainConnection": "Data Source=/home/Josn/AspNetCore/ContosoUniversity/Databases/database.db"
  },

Error

fail: Microsoft.EntityFrameworkCore.Query.RelationalQueryCompilationContextFactory[1]
      An exception occurred in the database while iterating the results of a query.
      Microsoft.Data.Sqlite.SqliteException: SQLite Error 1: 'no such table: AspNetUsers'.
         at Microsoft.Data.Sqlite.Interop.MarshalEx.ThrowExceptionForRC(Int32 rc, Sqlite3Handle db)
         at Microsoft.Data.Sqlite.SqliteCommand.ExecuteReader(CommandBehavior behavior)
         at Microsoft.Data.Sqlite.SqliteCommand.ExecuteReaderAsync(CommandBehavior behavior, CancellationToken cancellationToken)
         at Microsoft.Data.Sqlite.SqliteCommand.<ExecuteDbDataReaderAsync>d__53.MoveNext()
      --- End of stack trace from previous location where exception was thrown ---
         at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
         at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
         at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.<ExecuteAsync>d__20.MoveNext()
      --- End of stack trace from previous location where exception was thrown ---
         at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
         at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
         at Microsoft.EntityFrameworkCore.Query.Internal.AsyncQueryingEnumerable.AsyncEnumerator.<MoveNext>d__8.MoveNext()
      --- End of stack trace from previous location where exception was thrown ---
         at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
         at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
         at Microsoft.EntityFrameworkCore.Query.Internal.AsyncLinqOperatorProvider.<_FirstOrDefault>d__82`1.MoveNext()
      --- End of stack trace from previous location where exception was thrown ---
         at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
         at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
         at Microsoft.EntityFrameworkCore.Query.Internal.TaskResultAsyncEnumerable`1.Enumerator.<MoveNext>d__3.MoveNext()
      --- End of stack trace from previous location where exception was thrown ---
         at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
         at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
         at Microsoft.EntityFrameworkCore.Query.Internal.AsyncLinqOperatorProvider.ExceptionInterceptor`1.EnumeratorExceptionInterceptor.<MoveNext>d__5.MoveNext()

听起来你好像忘了打电话update-database在包管理器控制台中。这实际上是将您创建的迁移应用到连接的数据库。

另一个问题可能与您如何更新表名称有关。如果您直接编辑迁移，它无法知道您在运行时更改了名称，并且仍会查找默认的命名表。

要更改用户表名称，您需要在数据库上下文中执行类似的操作OnModelCreating method:

protected override void OnModelCreating( ModelBuilder builder ) {
    base.OnModelCreating( builder );
    // Customize the ASP.NET Identity model and override the defaults if needed.
    // For example, you can rename the ASP.NET Identity table names and more.
    // Add your customizations after calling base.OnModelCreating(builder);

    builder.Entity<ApplicationUser>() //Use your application user class here
           .ToTable( "ContosoUsers" ); //Set the table name here
}

然后，您需要创建一个迁移，以确保通过在包管理器控制台中运行以下命令来更新所有内容：

add-migration RenamedUserTable

然后快速跑update-database然后再试一次。