项目案例【Net Core】如何注入多个服务实现类

需求

库表保存时,需要校验逻辑.

提交时有更深层次校验.

**状态,还有特殊校验

接口

写一个通用的校验接口,这里定义了校验时间.每个阶段校验可能需要考虑顺序,增加一个顺序字段.

public interface IOrcderCheck
    {
        ECheckTime CheckTime { get; }
        bool Check(OrderModel orderModel, List<string> warnMsg);

         /// <summary>
        /// 校验排序,默认制定为0即可
        /// </summary>
        int SortNum { get; }
    }

实现类2个

public class CheckAge : IOrcderCheck
    {
        public ECheckTime CheckTime => ECheckTime.BeforeSign;
        /// <summary>
        /// 校验排序,默认制定为0即可
        /// </summary>
        public int SortNum { get { return 0; } }
        public bool Check(OrderModel orderModel, List<string> warnMsg)
        {
            //内部逻辑 如:年龄小于18岁,校验失败
return true;
        }
    }

 public class CheckCaStatus : IOrcderCheck
    { 
        /// <summary>
        /// 校验排序,默认制定为0即可
        /// </summary>
        public int SortNum { get { return 0; } }
        public ECheckTime CheckTime => ECheckTime.BeforeSubmit;
        DataAccess _da;
        IDBContext _db;
        CfcaManager _cfcaManager;
        IUserInfoRepository _userInfoRepository;
        public CheckCaStatus(IIndex<string, DataAccess> daArr, IIndex<string, IDBContext> dbArr,CfcaManager cfcaManager,IUserInfoRepository userInfoRepository)
        {
            this._da = daArr["acs"];
            this._db = dbArr["acs"];
            this._cfcaManager = cfcaManager;
            this._userInfoRepository = userInfoRepository;
        }public bool Check(OrderModel orderModel, List<string> warnMsg)
        {
            if (CheckDelStatus(orderModel))
            {
                warnMsg.Add("此申请已被删除,无法提交");
                return false;
            }
            //判断是否电子签成功
            var orderId = orderModel.OrderId;
            var res= this._cfcaManager.CheckCaForSubmit(orderId, ECaCategory.Camain);
            if(res.Value==1)
            {
                return true;//电子签成功
            }
            if(res.WarnResult!=null)
            {
                warnMsg.Add(res.WarnResult.Message); //不完全电子签的,提示完成电子签
            }
            else
            {
                warnMsg.Add("请完成协议签署后再提交"); 
            }
            return warnMsg.Count == 0;
        }
        

    }

注册封装

扩展IServiceCollection 接口方法 AddCheckRules,注册校验类

校验入口

ValidateOrderData
传入校验实体类和校验时间

orderModel, eCheckTime

  public static class OrderCheckServiceCollectionExtensions
    {

        public static IServiceCollection AddCheckRules(this IServiceCollection services)
        {
            if (services == null)
            {
                throw new ArgumentNullException(nameof(services));
            }

            services.AddSingleton<IOrcderCheck, CheckAge>();//计算年龄+贷款 > 65
            services.AddSingleton<IOrcderCheck, CheckCaStatus>();//电子签名状态校验 判断删除状态

            return services;
        }
        /// <summary>
        /// 通用订单提交校验入口.
        /// </summary>
        /// <param name="rules"></param>
        /// <param name="orderModel"></param>
        /// <param name="eCheckTime"></param>
        /// <returns></returns>
        public static List<string> ValidateOrderData(this IEnumerable<IOrcderCheck> rules, OrderModel orderModel, ECheckTime eCheckTime)
        {
            List<string> warnMsg = new List<string>();

            var newRules = rules.Where(r => r.CheckTime <= eCheckTime).OrderBy(o => o.SortNum);
            foreach (var rule in newRules)
            {          if (!rule.Check(orderModel, warnMsg))
                        break;
            }
            return warnMsg;
        }

       

    }

调用

注册

 services.AddCheckRules();

构造注入

IEnumerable<IOrcderCheck> _orderChecks;
public OrderCRepository(
IEnumerable<IOrcderCheck> orderChecks
)
{
            this._orderChecks = orderChecks;
}

函数调用

这里直接使用函数,判断校验类错误信息.

var msg = _orderChecks.ValidateOrderData(orderModel, ECheckTime.BeforeSubmit);
if (msg.Count > 0)
{
return new WarnResult(string.Join('|', msg));
}