AE二次開發中，過濾後的圖層，實現縮放至圖層效果

  //featureClass是自己獲取的featureClass，也可是sde中獲取的。

    public void FilterAndZoomToLayer(IFeatureClass featureClass)

          {

                    IFeatureLayer featureLayer = new FeatureLayerClass();

                    featureLayer.FeatureClass = featureClass;

                    IFeatureLayerDefinition featureLayerDefinition = featureLayer as IFeatureLayerDefinition;

                    //獲取符合條件的圖層要素

                    featureLayerDefinition.DefinitionExpression = "XZQDM like '" + xz_xzqdm + "%'";

                    IFeatureLayer newFeatureLayer = featureLayerDefinition.CreateSelectionLayer(featureClass.AliasName, false, null, featureLayerDefinition.DefinitionExpression);

                     ILayer newLayer = newFeatureLayer as ILayer;

                     mcView.AddLayer(newLayer);

                    //實現過濾後的圖層，縮放到圖層

                    IEnvelope envelope = new EnvelopeClass();

                    ILayer layer = mcView.get_Layer(0);

                    IFeatureLayer featureLayer = layer as IFeatureLayer;

                    IQueryFilter queryFilter = new QueryFilterClass();

                    queryFilter.WhereClause = "";

                    IFeatureCursor featureCursor = featureLayer.FeatureClass.Search(queryFilter, true);

                    IFeature feature = featureCursor.NextFeature();

                    while (feature != null)

                    {

                        IGeometry geometry = feature.Shape;

                        IEnvelope featureExtent = geometry.Envelope;

                        envelope.Union(featureExtent);

                        System.Runtime.InteropServices.Marshal.ReleaseComObject(feature);

                        feature = featureCursor.NextFeature();

                    }

                    mcView.ActiveView.FullExtent  = envelope;

           }