修改创建服务，判断卡使用已经其它人用过

src/Shentun.Peis.Domain/CardRegisters/CardRegisterManager.cs

@@ -26,13 +26,18 @@ namespace Shentun.Peis.CardRegisters
         /// </summary>
         /// <param name="entity"></param>
         /// <returns></returns>
-        public CardRegister CreateAsync(
+        public async Task<CardRegister> CreateAsync(
           CardRegister entity
          )
         {
             Check.NotNull<CardRegister>(entity, nameof(entity));
             Verify(entity);
-           
+            var queryable = await _repository.GetQueryableAsync();
+            var findedEntity = queryable.Where(x => x.CardNo == entity.CardNo && x.IsActive == 'Y').FirstOrDefault();
+            if (findedEntity != null)
+            {
+                throw new UserFriendlyException($"卡号已经被{findedEntity.CustomerName}使用");
+            }
             return new CardRegister(
                 GuidGenerator.Create()
              )