编辑器扩展，实现对要素的新建、编辑事件的监听。

可能的使用方式，比如希望在新建要素的时候，给要素自动增加Guid值、创建时间、系统用户名等，用以对要素的创建、修改进行记录。

核心代码如下：

protected override void OnStartup()
        {
            IEditor theEditor = ArcMap.Editor;

            Events.OnStartEditing += new IEditEvents_OnStartEditingEventHandler(Events_OnStartEditing);
            Events.OnStopEditing += new IEditEvents_OnStopEditingEventHandler(Events_OnStopEditing);
        }

        private void Events_OnStopEditing(bool save)
        {
            Events.OnCreateFeature += new IEditEvents_OnCreateFeatureEventHandler(Events_OnCreateChangeFeature);
            Events.OnChangeFeature += new IEditEvents_OnChangeFeatureEventHandler(Events_OnCreateChangeFeature);
        }

        private void Events_OnCreateChangeFeature(IObject obj)
        {
            IFeature pFeature = obj as IFeature;
            if (pFeature.Fields.FindField("Guid") != -1)
            {
                pFeature.set_Value(pFeature.Fields.FindField("Guid"), Guid.NewGuid().ToString());
            }

            if (pFeature.Fields.FindField("CreateTime") != -1)
            {
                pFeature.set_Value(pFeature.Fields.FindField("CreateTime"), DateTime.Now);
            }

            if (pFeature.Fields.FindField("CreateUser") != -1)
            {
                pFeature.set_Value(pFeature.Fields.FindField("CreateUser"), System.Environment.UserName);
            }

            //System.Diagnostics.Debug.WriteLine(pFeature.OID+":处理完成");
        }

        void Events_OnStartEditing()
        {
            Events.OnCreateFeature += new IEditEvents_OnCreateFeatureEventHandler(Events_OnCreateChangeFeature);
        }