请教往空白图层里加数据的问题（C#）

<P>我在C#里用下列语句往空白图层里加数据怎么不行：</P>
<P>MapObjects2.Point Pt=new MapObjects2.PointClass();
   MapObjects2.MapLayer Layer=new MapObjects2.MapLayerClass();
   MapObjects2.DataConnection Dc=new MapObjects2.DataConnectionClass();
   string Path="D:\\sc\\demo\\EmptyMap";</P>
<P>   Dc.Database=Path;
   Layer.GeoDataset=Dc.FindGeoDataset("PointLayer");
  
   Point=new MapObjects2.PointClass();
   Point=mapMain.Extent.Center;
  
   Layer.Records.AddNew();
   Layer.Records.Fields.Item("Shape").Value=Point;
   Layer.Records.Update();
   mapMain.Layers.Add(Layer);
   mapMain.Refresh();
   mapMain.CtlRefresh();</P>

<img src="images/post/smile/dvbbs/em06.gif" /><img src="images/post/smile/dvbbs/em05.gif" />

<P>Layer.Records.Update();前面是不是要加上</P><P>Layer,Records.StopEdit();</P>

<P>判断一下Layer.Records.updatable 是否为true</P><P>然后</P><P>layer.records.addnew();</P><P>...</P><P>layer.records.update();</P><P>layer.records.stopedit();</P>