获得FeatureClass的坐标系ISpatialReference

        /// <summary>        /// 获得坐标系统by yl [e-mail]        /// </summary>        /// <param name="pFeatureClass"></param>        /// <returns></returns>        public static ISpatialReference getSpatialReference(IFeatureClass pFeatureClass)        {            IGeoDataset pGeoDataset = pFeatureClass as IGeoDataset;            return pGeoDataset.SpatialReference;         }