/// <summary>
/// 根据省市区获取三级区域信息
/// </summary>
/// <param name="provinceId"></param>
/// <param name="cityId"></param>
/// <param name="districtId"></param>
/// <returns></returns>
private async Task <List <int> > GetDistrictIdsByRegionAsync(int provinceId, int cityId, int districtId)
{
var regionId = cityId > 0 ? cityId : (provinceId > 0 ? provinceId : 0);
var regionIds = districtId > 0 ? new List <int>(1)
{
districtId
} :
regionId > 0 ? await _regionService.GetDistrictIdsByRegionId(regionId)
: (await _regionService.GetAllDistrictsFromCache())?.Select(s => s.DistrictId)?.ToList();
return(regionIds);
}