Asp.net core 即使将该类添加到服务中，也无法从根提供程序解析作用域服务

在ASP.NET核心项目中，我有以下启动时的ConfigureServices方法：

 public void ConfigureServices(IServiceCollection services) {
   ...
   services.AddLiteDatabase<Database>(connectionString);
   ...
 }

我可以获取IWebHostEnvironment，但获取数据库时出错：

Cannot resolve scoped service 'Database' from root provider.'

我错过了什么

剩余代码

在方法

AddLiteDatabase

中，我有：

public static void AddLiteDatabase<T>(this IServiceCollection services, String connectionString) where T : LiteDatabase {
  T database = (T)Activator.CreateInstance(typeof(T), new Object[] { connectionString });
  services.AddScoped<T>(x => database);
}

其他类别包括：

public interface IDatabaseConfiguration<T> where T : LiteDatabase {
  void Configure();
}

public class Database : LiteDatabase {
  public Database(String connection) : base (connection) { }
}

public class DatabaseConfiguration : IDatabaseConfiguration<LiteDatabase> {

  private readonly IApplicationBuilder _builder;

  public DatabaseConfiguration(IApplicationBuilder builder) {
    _builder = builder;
  }

  public void Configure() { 
    IServiceProvider provider = _builder.ApplicationServices;
    IWebHostEnvironment environment = provider.GetService<IWebHostEnvironment>();
    Database database = provider.GetService<Database>();
    ...
  }
}

公共接口IDatabaseConfiguration，其中T:LiteDatabase{
void Configure（）；
}
公共类数据库：LiteDatabase{
公共数据库（字符串连接）：基本（连接）{}
}
公共类数据库配置：IDatabaseConfiguration{
私有只读IApplicationBuilder\u builder；
公共数据库配置（IApplicationBuilder）{
_建筑商=建筑商；
}
public void Configure（）{
IServiceProvider=\u builder.ApplicationServices；
IWebHostEnvironment环境=provider.GetService（）；
数据库=provider.GetService（）；
...
}
}

public static void AddLiteDatabase<T>(this IServiceCollection services, String connectionString) where T : LiteDatabase {
  T database = (T)Activator.CreateInstance(typeof(T), new Object[] { connectionString });
  services.AddScoped<T>(x => database);
}

public static void UseLiteDatabase<T>(this IApplicationBuilder builder) where T : IDatabaseConfiguration<LiteDatabase> {
  T configuration = (T)Activator.CreateInstance(typeof(T), new Object[] { builder });
  configuration.Configure();
}

public interface IDatabaseConfiguration<T> where T : LiteDatabase {
  void Configure();
}

public class Database : LiteDatabase {
  public Database(String connection) : base (connection) { }
}

public class DatabaseConfiguration : IDatabaseConfiguration<LiteDatabase> {

  private readonly IApplicationBuilder _builder;

  public DatabaseConfiguration(IApplicationBuilder builder) {
    _builder = builder;
  }

  public void Configure() { 
    IServiceProvider provider = _builder.ApplicationServices;
    IWebHostEnvironment environment = provider.GetService<IWebHostEnvironment>();
    Database database = provider.GetService<Database>();
    ...
  }
}