In response to issue on the Discourse forum how to disable zoom? :
The Map control currently has ZoomBarMinZoom and ZoomBarMaxZoom properties, that are related to the zoom levels supported by the current Tiling service. But these restrictions are not enforced when zooming with the mouse click or mouse wheel.
Add or enhance the properties to the Map control, to restrict the zoom levels or scale of the map, to stay within a specified zoom or scale range.