得到shp文件的坐标系

filePath为路径，比如：D\Documents and Settings\Administrator\桌面\shp\b.shp

private string getSpatialReference(string filePath)
        {
            string strSpatialReference = "";

            if (filePath.Length > 0)
            {
                string WorkSpacePath = System.IO.Path.GetDirectoryName(filePath);

                //获得打开IFeatureClass的字符串数组
                string ShapeFileName = System.IO.Path.GetFileName(filePath);

                IWorkspaceFactory pWorkspaceFactory = new ShapefileWorkspaceFactoryClass();
                IWorkspace pWorkspace = pWorkspaceFactory.OpenFromFile(WorkSpacePath, 0);
                IFeatureWorkspace pFeatureWorkspace = pWorkspace as IFeatureWorkspace;
               
                IFeatureClass pFeatureClass = pFeatureWorkspace.OpenFeatureClass(ShapeFileName);
                IDataset pDataset = pFeatureClass as IDataset;
               
                IFeatureLayer pFeatureLayer = new FeatureLayerClass();
                pFeatureLayer.FeatureClass = pFeatureClass;
                pFeatureLayer.Name = pDataset.Name;
                strSpatialReference = pFeatureLayer.AreaOfInterest.SpatialReference.Name;
            }
            return strSpatialReference;
        }