PetaPoco在ASP.NET Core 2.2中使用注入方式访问数据库

services.AddScoped<IDatabase>(
    x =>
       {
           var connectionStrnig = Configuration["ConnectionStrings:MySQL:MvcMySQL"];
           var configuration = DatabaseConfiguration.Build().UsingConnectionString(connectionStrnig)
                            .UsingProvider<MariaDbDatabaseProvider>();
           return new PetaPocoMvcDBContext(configuration);
       });
 
services.AddScoped<IDatabase, PetaPocoMvcDBContext>(
    (x) =>
         {
             var connectionStrnig = Configuration["ConnectionStrings:MySQL:MvcMySQL"];
             var configuration = DatabaseConfiguration.Build().UsingConnectionString(connectionStrnig)
                            .UsingProvider<MariaDbDatabaseProvider>();
             return new PetaPocoMvcDBContext(configuration);
         });

namespace PetaPocoEfCoreMvc.DBContext
{
    using System.Data.Common;
 
    using PetaPoco;
    using PetaPoco.Core;
 
    public class PetaPocoMvcDBContext:Database
    {
        public PetaPocoMvcDBContext(DbConnection connection, IMapper defaultMapper = null)
            : base(connection, defaultMapper)
        {
        }
 
        public PetaPocoMvcDBContext(string connectionString, string providerName, IMapper defaultMapper = null)
            : base(connectionString, providerName, defaultMapper)
        {
        }
 
        public PetaPocoMvcDBContext(string connectionString, DbProviderFactory factory, IMapper defaultMapper = null)
            : base(connectionString, factory, defaultMapper)
        {
        }
 
        public PetaPocoMvcDBContext(string connectionString, IProvider provider, IMapper defaultMapper = null)
            : base(connectionString, provider, defaultMapper)
        {
        }
 
        public PetaPocoMvcDBContext(IDatabaseBuildConfiguration configuration)
            : base(configuration)
        {
        }
    }
}

"ConnectionStrings": {
    "MySQL": {
      "MvcMySQL": "server=127.0.0.1;port=3306;uid=root;pwd=123456;database=WireCloud;",
      "provider": "MySql.Data.MySqlClient"
    }
  }

namespace PetaPocoEfCoreMvc.Service
{
    using PetaPocoEfCoreMvc.Models;

    public interface IUserService
    {
        IEnumerable<User> GetAll();
    }
}


namespace PetaPocoEfCoreMvc.Service
{
    using PetaPoco;
    using PetaPocoEfCoreMvc.Models;

    public class UserService:IUserService
    {
        private readonly IDatabase _database;
　　　   //构造函数注入
        public UserService(IDatabase database)
        {
            _database = database;
        }

        public IEnumerable<User> GetAll()
        {
            return _database.Fetch<User>();
        }
    }
}