public IFeature GetFeatureOnMouseDown(IPoint point)

        {

            try

            {

                ILayer layer = Common.GetLayerByName(mMap, "地块");

                if (layer == null)

                {

                    MessageBox.Show("请加载地块图层！", "提示");

                    return null;

                }

                //IFeatureLayer fLayer = layer as IFeatureLayer;

                //IFeatureSelection featureSelection = fLayer as IFeatureSelection;

                //featureSelection.Clear();

                //if (featureSelection == null)

                //{

                //    return null;

                //}

                IFeatureLayer featureLayer = layer as IFeatureLayer;

                if (featureLayer == null)

                    return null;

                IFeatureClass featureClass = featureLayer.FeatureClass;

                if (featureClass == null)

                    return null;

                //IPoint point = axMapControl1.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(x, y);

                IGeometry geometry = point as IGeometry;

                double length = ConvertPixelsToMapUnits(axMapControl1.ActiveView, );

                ITopologicalOperator pTopo = geometry as ITopologicalOperator;

                IGeometry buffer = pTopo.Buffer(length);

                geometry = buffer.Envelope as IGeometry;

                ISpatialFilter spatialFilter = new SpatialFilterClass();

                spatialFilter.Geometry = geometry;

                switch (featureClass.ShapeType)

                {

                    case esriGeometryType.esriGeometryPoint:

                        spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelContains;

                        break;

                    case esriGeometryType.esriGeometryPolygon:

                        spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;

                        break;

                    case esriGeometryType.esriGeometryPolyline:

                        spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelCrosses;

                        break;

                }

                spatialFilter.GeometryField = featureClass.ShapeFieldName;

                IQueryFilter filter = spatialFilter as IQueryFilter;

                IFeatureCursor cursor = featureClass.Search(filter, false);

                IFeature pfeature = cursor.NextFeature();

                if (pfeature != null)

                {

                    return pfeature;

                    //featureSelection.Add(pfeature);

                    //pfeature = cursor.NextFeature();

                }

                else

                {

                    return null;

                }

            }

            catch

            {

                return null;

            }

        }

if (pfeature != null)

                {

                    return pfeature;

                    //featureSelection.Add(pfeature);

                    //pfeature = cursor.NextFeature();

                }