IDbContextFactory该方法或操作未实现

Question

我正在使用IdentityServer4。

我想使用EF作为配置数据（教程[第一步] [http://identityserver4.readthedocs.io/en/release/quickstarts/8_entity_framework.html]）。

我statup.cs

namespace IdentityServer 
{ 
    public class Startup 
    { 
       { 
      services.AddMvc(); 

      var connectionString = @"Data Source=CR08186\\sqlexpress;Initial Catalog=IdentityServer;Persist Security Info=True;User ID=sa;Password=MsSql2008"; 
      var migrationsAssembly = typeof(Startup).GetTypeInfo().Assembly.GetName().Name; 

      // configure identity server with in-memory users, but EF stores for clients and resources 
      services.AddIdentityServer() 
       .AddTemporarySigningCredential() 
       .AddTestUsers(Config.GetUsers()) 
       .AddConfigurationStore(builder => 
        builder.UseSqlServer(connectionString, options => 
         options.MigrationsAssembly(migrationsAssembly))) 
       .AddOperationalStore(builder => 
        builder.UseSqlServer(connectionString, options => 
         options.MigrationsAssembly(migrationsAssembly))); 

     } 
} 

从CMD运行dotnet ef migrations add InitialIdentityServerMigration -c PersistedGrantDbContext 和 dotnet ef migrations add InitialIdentityServerPersistedGrantDbMigration -c PersistedGrantDbContext -o Data/Migrations/IdentityServer/PersistedGrantDb

，并有一个错误

An error occurred while calling method 'ConfigureServices' on startup class 'Startup'. Consider using IDbContextFactory to override the initialization of the DbContext at design-time. Error: The method or operation is not implemented. No DbContext named 'PersistedGrantDbContext' was found.

任何帮助，将不胜感激！

Answer 1

所以，问题出在使用的数据库。连接sting containg数据库，已经存在。 如果选择新的数据库（现在不存在），一切都会正常工作。