方法一、
IWorkspaceFactory pWorkspaceFactory; IFeatureWorkspace pFeatureWorkspace; IFeatureLayer pFeatureLayer; IFeatureDataset pFeatureDataset; //打开CAD数据集 pWorkspaceFactory = new CadWorkspaceFactoryClass(); pFeatureWorkspace = (IFeatureWorkspace)pWorkspaceFactory.OpenFromFile(directoryPath, 0); //打开一个要素集 pFeatureDataset = pFeatureWorkspace.OpenFeatureDataset(fileName); //IFeaturClassContainer可以管理IFeatureDataset中的每个要素类 IFeatureClassContainer pFeatureClassContainer = (IFeatureClassContainer)pFeatureDataset; //对CAD文件中的要素进行遍历处理 for (int i = 0; i < pFeatureClassContainer.ClassCount - 1; i++) { IFeatureClass pFeatureClass = pFeatureClassContainer.get_Class(i); if (pFeatureClass.FeatureType == esriFeatureType.esriFTAnnotation) { //如果是注记，则添加注记层 pFeatureLayer = new CadAnnotationLayerClass(); } else//
