/// <summary>              /// 获取所有要素集              /// </summary>              /// <param name="workspace">工作空间对象</param>              /// <returns>要素集列表</returns>              public static List<IFeatureDataset> GetAllFeatureClass(IWorkspace workspace)              {                  IEnumDataset dataset = workspace.get_Datasets(esriDatasetType.esriDTFeatureDataset);                  IFeatureDataset featureDataset = dataset.Next() as IFeatureDataset;                              List<IFeatureDataset> featureDatasetList = new List<IFeatureDataset>();                  while (featureDataset != null)                  {                      featureDatasetList.Add(featureDataset);                      featureDataset = dataset.Next() as IFeatureDataset;                  }                  return featureDatasetList;              }  

    /// <summary>      /// 获取所有要素类      /// </summary>      /// <param name="featureDataset">要素集</param>      /// <returns>要素类列表</returns>      public static List<IFeatureClass> GetAllFeatureClass(IFeatureDataset featureDataset)      {          IFeatureClassContainer featureClassContainer = (IFeatureClassContainer)featureDataset;          IEnumFeatureClass enumFeatureClass = featureClassContainer.Classes;          IFeatureClass featureClass = enumFeatureClass.Next();                List<IFeatureClass> featureClassList = new List<IFeatureClass>();          while (featureClass != null)          {              featureClassList.Add(featureClass);              featureClass = enumFeatureClass.Next();          }          return featureClassList;      }  

    /// <summary>      /// 获取所有要素      /// </summary>      /// <param name="featureClass">要素类</param>      /// <returns>要素列表</returns>      public static List<IFeature> GetAllFeatureClass(IFeatureClass featureClass)      {          List<IFeature> featureList = new List<IFeature>();          IFeatureCursor featureCursor = featureClass.Search(null, false);          IFeature feature = featureCursor.NextFeature();                while (feature != null)          {              featureList.Add(feature);              feature = featureCursor.NextFeature();          }          return featureList;      }