IFeatureConstruction 用法Example

public void CreatePolygonFeaturesFromCursors(IFeatureClass polygonFC,
  IFeatureClass lineFC)
{
  if (polygonFC.ShapeType != esriGeometryType.esriGeometryPolygon)
  {
    System.Console.WriteLine("The target layer is not a polygon layer.");
    return ;
  }

  //Set IFeatureCursor object, which will be the line source to construct polygons.
  IFeatureCursor lineFeatureCursor = lineFC.Search(null, false);

  //Set the processing bounds to be the extent of the polygon feature class,
  //which will be used to search for existing polygons in the target feature.
  IGeoDataset geoDS = polygonFC as IGeoDataset;
  IEnvelope processingBounds = geoDS.Extent;

  //Define an IInValidArea object.
  IInvalidArea invalidArea = new InvalidAreaClass();

  //Define a construct feature object.
  IFeatureConstruction featureConstruction = new FeatureConstructionClass();

  //Start an edit session.
  IDataset dataset = polygonFC as IDataset;
  IWorkspace workspace = dataset.Workspace;
  IWorkspaceEdit workspaceEdit = workspace as IWorkspaceEdit;

  if (workspaceEdit.IsBeingEdited() != true)
  {
    workspaceEdit.StartEditing(true);
    workspaceEdit.StartEditOperation();
  }


  try
  {
    //**********Construct polygons using the line feature cursor.************//
    featureConstruction.ConstructPolygonsFromFeaturesFromCursor(null, polygonFC,
      processingBounds, true, false, lineFeatureCursor, invalidArea,  - 1, null)
      ;

    //**********AutoComplete the polygons.*************//
    //IWorkspace selWorkspace = polygonFC.FeatureDataset.Workspace;
    //ISelectionSet selectionSet;
    //featureConstruction.AutoCompleteFromFeaturesFromCursor(polygonFC, processingBounds, lineFeatureCursor,
    // invalidArea, -1, selWorkspace, out selectionSet);

    //**********Split the polygons.***************//
    //featureConstruction.SplitPolygonsWithLinesFromCursor(null, polygonFC, processingBounds, 
    // lineFeatureCursor, invalidArea, -1);

    //Complete the edit operation and stop the edit session.
    workspaceEdit.StopEditOperation();
    workspaceEdit.StopEditing(true);
  }

  catch (Exception e)
  {
    //Abort the edit operation if errors are detected.
    System.Console.WriteLine("Construct polygons failed. " + e.Message);
    workspaceEdit.AbortEditOperation();
  }
}