DotNetCore跨平台~EFCore数据上下文的创建方式

  　public partial class ErpContext : DbContext, IERPContext
    {
        public ErpContext(DbContextOptions dbContextOptions) : base(dbContextOptions)
        { }
　 　}

            services.AddDbContextPool<ErpContext>(
                options => options.UseMySql("Server=123.56.31.133;DataBase=erp;UID=front;Password=PlP2017_#Test;charset=utf8;port=3306;SslMode=None"));

 public ValuesController(ErpContext context)
　{
            this.context = context;
　}

 protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseMySql("Server=123.56.31.133;DataBase=erp;UID=front;Password=PlP2017_#Test;charset=utf8;port=3306;SslMode=None");
            base.OnConfiguring(optionsBuilder);
        }

 public class ERPRepository<T> : EFRepository<T> where T : class
    {
         public ERPRepository() : base(new ErpContext(
            new DbContextOptionsBuilder().UseMySql("Server=123.56.31.133;DataBase=erp;UID=front;Password=PlP2017_#Test;charset=utf8;port=3306;SslMode=None").Options))
        { }
    }

 　　　　　　//一对多，效率很低
            var linq2 = from data1 in crm_customers.GetModel()
                        join data2 in crm_customertag.GetModel()
                        on data1.Id equals data2.CustomerId into list
                        select new
                        {
                            name = data1.AccountantName,
                            orders = list,
                        };

            var result2 = linq2.Take(10).ToList();