1.三张表的关系
2.接口的实现
public byte[] SCCToXlsx(IEnumerable<County> StateProvinceCC)
{
var properties = new[]
{
new PropertyByName<County>("区/县", p => p.Name),
new PropertyByName<County>("城市", p =>GetCity(p.CityId)),
new PropertyByName<County>("省份", p =>GetStateProvinceName(GetStateProvince(p.CityId)))
};
return ExportToXlsx(properties, StateProvinceCC);
}
//通过区县id获取城市名称
public string GetCity(int id)
{
return _cityService.GetCityById(id).Name;
}
/// <summary>
/// 得到省的id
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public int GetStateProvince(int id)
{
return _cityService.GetCityById(id).StateProvinceId;//省的id
}
/// <summary>
/// 通过id获取到省名称
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public string GetStateProvinceName(int id)
{
return _stateProvinceService.GetStateProvinceById(id).Name; ;
}