Asp.net核心 - 没有这样的表：AspNetUsers

Question

所以我试图为我的asp.net核心应用程序实现用户登录。 我在这里关注微软教程。 我有两个上下文，一个叫做SchoolContext，用于保存所有与学校相关的模型，另一个叫做ApplicationDbContext，用于Account模型。 这都被保存到sqlite数据库。
一切正常，直到我尝试将用户注册到我的上下文。 当我尝试注册我得到的用户时，无法找到AspNetUsers表错误。 如果我查看数据库，我没有看到AspNetUser表。 我尝试添加迁移 ，但我仍然得到同样的错误。 为什么没有创建表？

Startup.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);
        }
    }

ApplicationDbContext.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);
        }
    }
}

ApplicationUser.cs

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

appsettings.json

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

错误

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()

Answer 1

听起来你忘了在包管理器控制台中调用update-database 。 这就是您实际将迁移应用到已连接数据库的内容。

另一个问题可能是您更新表名称的方式。 如果您直接编辑了迁移，则无法知道您在运行时更改了名称，并且仍将查找默认的命名表。

要更改用户表名，您希望在OnModelCreating方法的数据库上下文中执行OnModelCreating ：

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内容来更新所有内容：

add-migration RenamedUserTable

然后运行快速update-database并再试一次。

Answer 2

我通过在OnModelCreating方法中提供表名来解决我遇到的同样问题。

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            string SQLLiteConnectionString = @"Data Source=C:/Projects/ArticlesDB.db";
            optionsBuilder.UseSqlite(SQLLiteConnectionString);             
        }
protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Articles>().ToTable("Articles");
            modelBuilder.Entity<Articles>(entity =>
            {
                entity.Property(e => e.Id).IsRequired();
            });
        }