Microsoft Visual Studio 2017中的.NET核心2.0解决方案，带有最新更新
自从我在.NET核心1.1上运行得很好以来，我的应用程序还没有运行。在看了一些Shawn Wildermuth，Kevin Dockx和Julie Lehrman关于Pluralsight的视频后，我开始了一个非常好的开始。不幸的是，现在.NET 2.0中的事情发生了根本性的变化！我最初尝试升级，但这是一场灾难！我最终放弃并重新开始使用.NET核心2.0解决方案并复制/粘贴旧代码。
我的解决方案有两个项目，一个用于API的ASP.NET核心应用程序和一个用于数据的.NET核心控制台应用程序。我使用ASP.NET身份核心与Entity Framework Core（2.0.1），并且我连接到MSSQL Server 2017 SQLEXPRESS数据库。
当我重新开始时，我没有数据库。所以我打开包管理器并运行＆＃34; Add-Migration Initial＆＃34;。这会生成以下输出...
PM> Add-Migration Initial
Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[0]
User profile is available. Using 'C:\Users\user1\AppData\Local\ASP.NET\DataProtection-Keys' as key repository and Windows DPAPI to encrypt keys at rest.
Microsoft.EntityFrameworkCore.Infrastructure[10403]
Entity Framework Core 2.0.1-rtm-125 initialized 'DatabaseContext' using provider 'Microsoft.EntityFrameworkCore.SqlServer' with options: None
Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (256ms) [Parameters=[], CommandType='Text', CommandTimeout='60']
CREATE DATABASE [CFC0000001TC];
Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (58ms) [Parameters=[], CommandType='Text', CommandTimeout='60']
IF SERVERPROPERTY('EngineEdition') <> 5 EXEC(N'ALTER DATABASE [CFC0000001TC] SET READ_COMMITTED_SNAPSHOT ON;');
Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (6ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE [__EFMigrationsHistory] (
[MigrationId] nvarchar(150) NOT NULL,
[ProductVersion] nvarchar(32) NOT NULL,
CONSTRAINT [PK___EFMigrationsHistory] PRIMARY KEY ([MigrationId])
);
Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (2ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT OBJECT_ID(N'__EFMigrationsHistory');
Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (1ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT [MigrationId], [ProductVersion]
FROM [__EFMigrationsHistory]
ORDER BY [MigrationId];
Microsoft.EntityFrameworkCore.Migrations[20405]
No migrations were applied. The database is already up to date.
fail: Microsoft.EntityFrameworkCore.Database.Command[20102]
Failed executing DbCommand (24ms) [Parameters=[@__normalizedUserName_0='?' (Size = 256)], CommandType='Text', CommandTimeout='30']
SELECT TOP(1) [u].[Id], [u].[AccessFailedCount], [u].[ConcurrencyStamp], [u].[Email], [u].[EmailConfirmed], [u].[FirstName], [u].[LastName], [u].[LockoutEnabled], [u].[LockoutEnd], [u].[NormalizedEmail], [u]. [NormalizedUserName], [u].[PasswordHash], [u].[PhoneNumber], [u].[PhoneNumberConfirmed], [u].[SecurityStamp], [u].[TwoFactorEnabled], [u].[UserName]
FROM [SystemUser] AS [u]
WHERE [u].[NormalizedUserName] = @__normalizedUserName_0
System.Data.SqlClient.SqlException (0x80131904): Invalid object name 'SystemUser'.
at System.Data.SqlClient.SqlCommand.<>c.<ExecuteDbDataReaderAsync>b__108_0(Task`1 result)
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.<ExecuteAsync>d__17.MoveNext()
ClientConnectionId:9a66b342-9ca7-427e-af3a-8cffa483c72f
Error Number:208,State:1,Class:16
fail: Microsoft.EntityFrameworkCore.Database.Command[20102]
Failed executing DbCommand (24ms) [Parameters=[@__normalizedUserName_0='?' (Size = 256)], CommandType='Text', CommandTimeout='30']
SELECT TOP(1) [u].[Id], [u].[AccessFailedCount], [u].[ConcurrencyStamp], [u].[Email], [u].[EmailConfirmed], [u].[FirstName], [u].[LastName], [u].[LockoutEnabled], [u].[LockoutEnd], [u].[NormalizedEmail], [u]. [NormalizedUserName], [u].[PasswordHash], [u].[PhoneNumber], [u].[PhoneNumberConfirmed], [u].[SecurityStamp], [u].[TwoFactorEnabled], [u].[UserName]
FROM [SystemUser] AS [u]
WHERE [u].[NormalizedUserName] = @__normalizedUserName_0
System.Data.SqlClient.SqlException (0x80131904): Invalid object name 'SystemUser'.
at System.Data.SqlClient.SqlCommand.<>c.<ExecuteDbDataReaderAsync>b__108_0(Task`1 result)
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot)
--- End of stack trace from previous location where exception was thrown ---
如您所见，生成以下错误消息：
无效的对象名称＆＃39; SystemUser＆＃39;。
当我使用SQL Management Studio查看创建的数据库时，我只能看到一个表，它与EF迁移有关。没有与ASP.NET标识或其他任何内容相关的表。
其他信息：
否＆＃34;迁移＆＃34;在我的项目中生成/创建文件夹
我的数据库上下文类继承自IdentityDbContext
我的数据库上下文（以及其他项目）包含以下两个函数：
public DatabaseContext(DbContextOptions<DatabaseContext> options) :
base(options)
{
Database.Migrate();
}
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseSqlServer("Server=MYSERVER\\SQLEXPRESS;Database=CFC0000001TC;Trusted_Connection=True;");
}
我的创业班＆＃39; ConfigureServices包含：
services.AddDbContext<DatabaseContext>(ServiceLifetime.Scoped);
services.AddIdentity<Data.Entities.System.SystemUser, IdentityRole>().AddEntityFrameworkStores<DatabaseContext>();
services.AddScoped<IRepository, Repository>();
services.AddTransient<DatabaseInitializer>();
我的创业班＆＃39;配置包含：
app.UseAuthentication();
另外，我的创业班＆＃39;配置包含（作为最后一行）：
databaseInitializer.Seed().Wait();
如果我只运行应用程序，它似乎在 databaseInitializer.Seed（）。Wait（）调用的第一行失败，其中包含对 UserManager.FindByNameAsync的调用（ ...
你能帮我解决一下这里有什么问题吗？当我运行＆＃34; Add-Migration Initial＆＃34;？
时，我的数据库中没有生成ASP.NET标识核心表的可能原因是什么？