程序代码：

        public static Features SearchLayerFeature(AxMap axMap, double X, double Y, string LayerName, float Radius)
        {
            Layer layer = null;
            try
            {
                layer = axMap.Layers.Item(LayerName);
                MapXLib.Point source = new PointClass();
                source.Set(X, Y);
                return layer.SearchWithinDistance(source, (double) Radius, 7, 1);
            }
            catch
            {
                return null;
            }
        }