介紹一種簡單的獲取向量圖層空間參考的方法：
首先開啟Shp檔案獲得FeatureClass，程式碼如下：

            string pPath="D:\\test.shp";
            string pFolder=Path.GetDirectoryName (pPath);
            string pFileName=Path.GetFileName(pPath);
            IWorkspace pWorkspace=pWorkspaceFactory .OpenFromFile(pFolder ,0); 
            IFeatureWorkspace pFeatureWorkspace =pWorkspace as
 
 IFeatureWorkspace ;
            IFeatureClass pFeatureClass=pFeatureWorkspace .OpenFeatureClass (pFileName ); 

然後 由FeatureClass得到空間參考，程式碼如下：

IGeoDataset pGeoDataset = (IGeoDataset)pFeatureClass;
ISpatialReference pSpatialReference = pGeoDataset.SpatialReference;