//删除要素类.

 //例如:workspacePath=@"G:\doc\gis\1.400\data\pdb.mdb", featureClassPath="res2_4m".

 private void featureClass_delete(string workspacePath, string featureClassPath) {

     ESRI.ArcGIS.Geodatabase.IWorkspaceFactory wsf = new ESRI.ArcGIS.DataSourcesGDB.AccessWorkspaceFactoryClass();

     ESRI.ArcGIS.Geodatabase.IWorkspace ws = wsf.OpenFromFile(workspacePath, );

     ESRI.ArcGIS.Geodatabase.IFeatureWorkspace fws = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)ws;

     ESRI.ArcGIS.Geodatabase.IFeatureClass fc = fws.OpenFeatureClass(featureClassPath);

     //注意的是这里需要为IDataset(IFeatureClass没有删除的功能).

     ESRI.ArcGIS.Geodatabase.IDataset ds = (ESRI.ArcGIS.Geodatabase.IDataset)fc;

     ds.Delete();

 }