请教：ArcGISServer中如何进行编辑

<P>比如 在一个多边形的图层中 新增一个多边形</P>
<P>我的方法是 点击toolbar中一个tool，执行画多边形的客户端代码，然后在map的polygon事件中取得我画的多边形，存如当前的多边形图层，polygon事件响应代码如下：</P>
<P>private void Map1_Polygon(object sender, ESRI.ArcGIS.Server.WebControls.PolygonEventArgs args)<BR>  {<BR>   if (args.ToolName == "newpolygon")<BR>   {<BR>    ESRI.ArcGIS.Server.WebControls.WebMap webmap = Map1.CreateWebMap();<BR>    IFeatureLayer flayer = (webmap.MapServer as IMapServerObjects).get_Layer(webmap.DataFrame,0) as IFeatureLayer;        //获取当前活动图层了函数，这里就不贴了，就是调用GetFeatureLayer(int lyid)函数<BR>    if (flayer == null) return;<BR>    <BR>    if (flayer.FeatureClass.ShapeType != ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon) <BR>    {<BR>     string sc;<BR>     sc = "<script language=javascript>alert('当前图层何类型不对！')</script>";<BR>     Page.RegisterClientScriptBlock("ShapeTypeError",sc);<BR>     return;<BR>    }<BR>    <BR>    //生成多边形<BR>    ESRI.ArcGIS.Server.IServerContext context;<BR>    webmap.ManageLifetime(flayer);<BR>    context = webmap.ServerContext;<BR>    ESRI.ArcGIS.Geometry.IPolygon poly = context.CreateObject("esriGeometry.Polygon") as ESRI.ArcGIS.Geometry.IPolygon; //'new ag.PolygonClass();<BR>    webmap.ManageLifetime(poly);<BR>    ESRI.ArcGIS.Geometry.IPoint pt;<BR>    ESRI.ArcGIS.Geometry.IGeometryCollection ringcol = context.CreateObject("esriGeometry.Polygon") as ESRI.ArcGIS.Geometry.IGeometryCollection;// new  PolygonClass();<BR>    webmap.ManageLifetime(ringcol);<BR>    ESRI.ArcGIS.Geometry.IPointCollection ptcol =context.CreateObject("esriGeometry.Ring") as ESRI.ArcGIS.Geometry.IPointCollection;// new RingClass();<BR>    webmap.ManageLifetime(ptcol);<BR>    object obj=Type.Missing;<BR>    for (int i=0;i<=args.Vectors.Length-1;i++)<BR>    {<BR>     pt = webmap.ToMapPoint(args.Vectors.X,args.Vectors.Y);<BR>     ptcol.AddPoint(pt,ref obj,ref obj);<BR>    }<BR>    ringcol.AddGeometry(ptcol as IGeometry,ref obj,ref obj);    <BR>    poly = ringcol as IPolygon;    <BR>    <BR>    <BR>    //将多边形写入到图层中<BR>    ESRI.ArcGIS.Geodatabase.IDataset dataset=flayer.FeatureClass as IDataset;<BR>    ESRI.ArcGIS.Geodatabase.IWorkspaceEdit edit=dataset.Workspace as IWorkspaceEdit;<BR>    edit.StartEditOperation();<BR>    <FONT color=#ff3300>ESRI.ArcGIS.Geodatabase.IFeature feature =  flayer.FeatureClass.CreateFeature();<BR></FONT>    feature.Shape = poly as IGeometry;<BR>    feature.Store();<BR>    edit.StopEditOperation();<BR>    webmap.Refresh();</P>
<P>    webmap.Dispose();</P>
<P>   }<BR>  }</P>
<P>程序在红色处报错，麻烦各位帮忙看看</P>

<P>ding 看看我.做的,我已经发到上面了.你找找看.</P>

数据必须要用SDE来连接？