Aspnet Boilerplate Dynamic Setting Service via repository

AbpDynamicSettingService.cs

using System.Linq;
using Abp.Collections.Extensions;
using Abp.Configuration;
using Abp.Dependency;
using Abp.Domain.Repositories;
using Abp.Domain.Uow;

namespace MyCompanyName.AbpZeroTemplate.MySettingService
{
    public class DynamicSettingService : ITransientDependency
    {
        private readonly IRepository<Setting, long> _settingRepository;
        private readonly IUnitOfWorkManager _unitOfWorkManager;

        public DynamicSettingService(IRepository<Setting, long> settingRepository, 
            IUnitOfWorkManager unitOfWorkManager)
        {
            _settingRepository = settingRepository;
            _unitOfWorkManager = unitOfWorkManager;
        }

        public string GetSettingValue(string settingName, int? tenantId = null, int? userId = null)
        {
            var setting = _settingRepository
                .GetAll()
                .Where(x => x.Name == settingName)
                .WhereIf(tenantId.HasValue, x => x.TenantId == tenantId.Value)
                .WhereIf(userId.HasValue, x => x.UserId == userId.Value)
                .FirstOrDefault();

            return setting?.Value;
        }

        public void SetSettingValue(string settingName, string settingValue, int? tenantId = null, int? userId = null)
        {
            var setting = _settingRepository
                .GetAll()
                .Where(x => x.Name == settingName)
                .WhereIf(tenantId.HasValue, x => x.TenantId == tenantId.Value)
                .WhereIf(userId.HasValue, x => x.UserId == userId.Value)
                .FirstOrDefault();

            if (setting == null)
            {
                _settingRepository.InsertAndGetId(new Setting(tenantId, userId, settingName, settingValue));
            }
            else
            {
                setting.Value = settingValue;
                _settingRepository.Update(setting);
            }

            _unitOfWorkManager.Current.SaveChanges();
        }
    }

    public class MyTestUsageClass : ITransientDependency
    {
        private readonly DynamicSettingService _dynamicSettingService;

        public MyTestUsageClass(DynamicSettingService dynamicSettingService)
        {
            _dynamicSettingService = dynamicSettingService;
        }

        private void Test()
        {
            var mySettingValue = _dynamicSettingService.GetSettingValue("MySettingName");
            _dynamicSettingService.SetSettingValue("MySettingName", "123456");
        }
    }
}