ArcEngine要素编辑遇到的一些问题

1、如何开启编辑

IMap myMap = this._Aplication.ActiveView.FocusMap;
IWorkspace myWorkspace = (myMap25Sheet.PointFeatureLayer as IDataset).Workspace;
this._Aplication.EngineEditor.EnableUndoRedo(true);
this._Aplication.EngineEditor.StartEditing(myWorkspace, myMap);
this._Aplication.EngineEditor.StartOperation();

2、如何设置要编辑的目标图层
IEngineEditLayers myEngineEditLayers = this._Aplication.EngineEditor as IEngineEditLayers;
myEngineEditLayers.SetTargetLayer(myMap25Sheet.PointFeatureLayer, 0);

3、编辑的不符合规则，如何回退

IWorkspaceEdit myWorkspaceEdit = this._Application.EngineEditor.EditWorkspace as IWorkspaceEdit;
bool myHasUndo = false;
myWorkspaceEdit.HasUndos(ref myHasUndo);
if (myHasUndo == true)
{
IMap myMap = this._Application.ActiveView.FocusMap;
((IActiveView)myMap).PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, null);
myMap.ClearSelection();
((IActiveView)myMap).PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, null);
myWorkspaceEdit.UndoEditOperation();
this._Application.ActiveView.Refresh();
}

注意，一定要调用清空选择那块的代码，不然回退后，刷新下地图，又会重新回来，发现这个问题花了好长时间。

4、如何控制只能选择和编辑一个要素

private void EngineEditor_OnSelectionChanged()
        {
            Map25Sheet myMap25Sheet = this._Application.WorkZone.ActiveMap25Sheet;
            if (myMap25Sheet == null)
            {
                this._Application.SamplePointInfoUI.SetPointFeature(null);
                return;
            }
            IFeatureLayer myFeatureLayer = myMap25Sheet.PointFeatureLayer;
            IFeatureSelection myFeatureSelection = myMap25Sheet.PointFeatureLayer as IFeatureSelection;
            if (myFeatureSelection.SelectionSet.Count == 0)
            {
                this._Application.SamplePointInfoUI.SetPointFeature(null);
                return;
            }
            int myID = myFeatureSelection.SelectionSet.IDs.Next();
            if (myFeatureSelection.SelectionSet.Count > 1)
            {
                myFeatureSelection.Clear();
                myFeatureSelection.SelectionSet.Add(myID);
            }
            this._Application.SamplePointInfoUI.SetPointFeature(myFeatureLayer.FeatureClass.GetFeature(myID));
            this._Application.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, null);
        }

EngineEditor的OnSelectionChanged事件，在这控制下即可。

5、如何只编辑一个图层

控制其他图层不能不能被选择即可。

myFeatureLayer.Selectable = false;

6、ArcEngine中没有保存函数，如何保存编辑

先停止编辑，调用停止的时候，把是否保存参数设置为true，然后再重新开启即可。