ArcEngine删除sde中的图层

刚接触GIS开发.从代码中摘录出来的.

   //ArcGIS 打开SDE数据库
   IPropertySet pOutSDEPropset;
   pOutSDEPropset = new PropertySet();
   pOutSDEPropset.SetProperty("SERVER",ServerName);
   pOutSDEPropset.SetProperty("INSTANCE",instance);
   pOutSDEPropset.SetProperty("USER",UserName);
   pOutSDEPropset.SetProperty("Password",PassWord);
   pOutSDEPropset.SetProperty("version",SDEVersion);
   

   //获取空间数据库对象的管理器
   IWorkspaceFactory pWorkFact;
   //这句话貌似根据数据库类型不同new的方法不一样.
   //sde的是new 的SdeWorkspaceFactoryClass.
   pWorkFact = new SdeWorkspaceFactoryClass();

   //这个地方有些疑问,有的是用IFeatureWorkspace. 如: IFeatureWorkspace Workspace = Fact.Open(Propset,0) as IFeatureWorkspace;
   //可能是我这边主要是想删除表(图层)吧,反正我这边项目中的代码是 IWorkspace.
   IWorkspace pOutSDEWorkspace;
   pOutSDEWorkspace = pWorkFact.Open(pOutSDEPropset,0);

   //获取DataSet名字,实际运行起来,pEnumDsName里面是sde下的表空间名称
   IEnumDatasetName pEnumDsName = pOutSDEWorkspace.get_DatasetNames(esriDatasetType.esriDTFeatureDataset);
   
   //新建这个东西是为了循环这些表空间后,找到对应的表空间将其赋值给他.
   IFeatureDatasetName pOutSDEFeatDSName = null;
   
   ///循环开始找到的表空间.

   //这句是重置位置,表示下面开始从第一个循环.
   pEnumDsName.Reset();
   IDatasetName pSDEDSname;
   //取得下一个
   pSDEDSname = pEnumDsName.Next();
   //找到对应的 DatasetName,将 IDatasetName 转化为  IFeatureDatasetName.
   while(pSDEDSname != null)
   {
    if(pSDEDSname.Name ==SDEDSname)
    {
     pOutSDEFeatDSName = (IFeatureDatasetName)pSDEDSname;
     break;
    }
    pSDEDSname = pEnumDsName.Next();  
   }

   //这句是将该表空间的FeatureClassNames取出来.实际上取出来的都是表名(图层名)
   //不过这个地方 他将表空间中的表组织成了IEnumDatasetName结构.
   //之间他将用户sde下的表空间也组织成了IEnumDatasetName结构.
   IEnumDatasetName pEnumFcName_del = pOutSDEFeatDSName.FeatureClassNames;
   
   //以下循环这些表.

   pEnumFcName_del.Reset();

   IDatasetName tmpDs = pEnumFcName_del.Next();
   while(tmpDs != null)
   {
    //判断表名是不是要删除的表名
    if(tmpDs.Name.ToUpper() ==  UserName.ToUpper()+"."+NewLayName.ToUpper())
    {
     
     break;
    } 
    else
    {
     tmpDs = pEnumFcName.Next();
    }
   }
   //找到了要删除的表名
   if(tmpDs != null)
   {
    //这个时候就将 IWorkspace转化为IFeatureWorkspace了.
    IFeatureWorkspace pFWS = pOutSDEWorkspace as IFeatureWorkspace;
    //再转为这个IFeatureWorkspaceManage 才能执行 delete.真麻烦.
    IFeatureWorkspaceManage pFWSM;
    pFWSM = (IFeatureWorkspaceManage)pFWS;
    pFWSM.DeleteByName(tmpDs);
   }