/// <summary>
/// 根据映射键和类型获取映射对象
/// </summary>
/// <param name="mappingKey">映射的第三方键</param>
/// <param name="type">映射类型</param>
/// <returns>映射对象</returns>
public Mapping GetMappingByMappingKey(string mappingKey, MappingType type)
{
var spec = mappingRepository.CreateSpecification()
.Where(o => o.MappingKey == mappingKey && o.MappingType == type);
return(mappingRepository.FindOne(spec));
}