Click here to Skip to main content
11,930,788 members (44,199 online)
Click here to Skip to main content
Add your own
alternative version


482 bookmarked

GMap.NET - Great Maps for Windows Forms and Presentation

, 16 Apr 2013 MIT
Rate this:
Please Sign up or sign in to vote.
GMap.NET is a powerful, free, cross platform, Open Source .NET control. It enables the use of routing, geocoding, and maps from Google, Yahoo!, OpenStreet in Windows Forms and Presentation, and supports caching!



Google Maps are cool, yeah? But it's useful only in the browser, and is insufficient for real time tracking. It also does not have cache so Google servers are overloaded. This control removes all these deficiencies! It also gives the .NET developer unlimited ability to extend it!

GMap.NET is great and Powerful, Free, cross platform, open source .NET control. Enable use routing, geocoding, directions and maps from Google, Yahoo!, Bing, OpenStreetMap, ArcGIS, Pergo, SigPac, Yandex,,,, NearMap, OviMap, CloudMade, WikiMapia, MapQuest in Windows Forms & Presentation, supports caching and runs on windows mobile! 


The basic idea is simple: get the required data from Google/etc., cache it, and use it. Fast, simple, and practical.

Using the Code

It's more than easy. GMap.NET.dll and GMap.NET.WindowsForms.dll contain the user control. Add it to your project and simply use it.

Here are the basic control initial options: 

public MainForm()


   System.Net.IPHostEntry e =
   MainMap.Manager.Mode = AccessMode.CacheOnly;
   MessageBox.Show("No internet connection avaible, going to CacheOnly mode.", 
         "GMap.NET - Demo.WindowsForms", MessageBoxButtons.OK,

// config map
MainMap.MapProvider = GMapProviders.OpenStreetMap;
MainMap.Position = new PointLatLng(54.6961334816182, 25.2985095977783);
MainMap.MinZoom = 0;
MainMap.MaxZoom = 24;
MainMap.Zoom = 9;

// add your custom map db provider
//GMap.NET.CacheProviders.MySQLPureImageCache ch = new GMap.NET.CacheProviders.MySQLPureImageCache();
//ch.ConnectionString = @"server=sql2008;User Id=trolis;Persist Security Info=True;database=gmapnetcache;password=trolis;";
//MainMap.Manager.SecondaryCache = ch;

// set your proxy here if need
//GMapProvider.WebProxy = new WebProxy("", 8080);
//GMapProvider.WebProxy.Credentials = new NetworkCredential("", "bilgeada");

// map events
   MainMap.OnPositionChanged += new PositionChanged(MainMap_OnPositionChanged);

   MainMap.OnTileLoadStart += new TileLoadStart(MainMap_OnTileLoadStart);
   MainMap.OnTileLoadComplete += new TileLoadComplete(MainMap_OnTileLoadComplete);

   MainMap.OnMapZoomChanged += new MapZoomChanged(MainMap_OnMapZoomChanged);
   MainMap.OnMapTypeChanged += new MapTypeChanged(MainMap_OnMapTypeChanged);

   MainMap.OnMarkerClick += new MarkerClick(MainMap_OnMarkerClick);
   MainMap.OnMarkerEnter += new MarkerEnter(MainMap_OnMarkerEnter);
   MainMap.OnMarkerLeave += new MarkerLeave(MainMap_OnMarkerLeave);

   MainMap.OnPolygonEnter += new PolygonEnter(MainMap_OnPolygonEnter);
   MainMap.OnPolygonLeave += new PolygonLeave(MainMap_OnPolygonLeave);

   MainMap.OnRouteEnter += new RouteEnter(MainMap_OnRouteEnter);
   MainMap.OnRouteLeave += new RouteLeave(MainMap_OnRouteLeave);

   MainMap.Manager.OnTileCacheComplete += new TileCacheComplete(OnTileCacheComplete);
   MainMap.Manager.OnTileCacheStart += new TileCacheStart(OnTileCacheStart);
   MainMap.Manager.OnTileCacheProgress += new TileCacheProgress(OnTileCacheProgress);

As you can see, the control options are quite simple. And there is nothing more to add.

Points of Interest

Well, it was quite cryptic to figure out how Google manages tiles, what coordinate system it uses, the JSON decryption, etc.


Go to the project's CodePlex site to get a running update of any changes or improvements I've made.  


This article, along with any associated source code and files, is licensed under The MIT License


About the Author
Software Developer
Lithuania Lithuania
No Biography provided

You may also be interested in...

Comments and Discussions

QuestionTilt Map Pin
Member 42973466-Aug-14 17:27
memberMember 42973466-Aug-14 17:27 
QuestionReally wished this worked. Pin
Daniel Krusky27-Jul-14 8:22
memberDaniel Krusky27-Jul-14 8:22 
AnswerRe: Really wished this worked. Pin
radioman.lt29-Jul-14 2:31
memberradioman.lt29-Jul-14 2:31 
Questionmultiple Marker Cursor freeze to "Hand" Pin
Member 1058111922-Feb-14 4:19
memberMember 1058111922-Feb-14 4:19 
AnswerRe: multiple Marker Cursor freeze to "Hand" Pin
radioman.lt22-Feb-14 8:52
memberradioman.lt22-Feb-14 8:52 
GeneralRe: multiple Marker Cursor freeze to "Hand" Pin
willi-5824-Feb-14 16:47
memberwilli-5824-Feb-14 16:47 
QuestionGood job! Pin
g0d20127-Jan-14 20:06
memberg0d20127-Jan-14 20:06 
GeneralMy vote of 5 Pin
ThatsAlok8-Nov-13 3:01
memberThatsAlok8-Nov-13 3:01 
GeneralMy vote of 1 Pin
davemaster995-Jul-13 13:58
memberdavemaster995-Jul-13 13:58 
GeneralRe: My vote of 1 Pin
radioman.lt7-Jul-13 11:12
memberradioman.lt7-Jul-13 11:12 
GeneralRe: My vote of 1 Pin
davemaster997-Jul-13 16:38
memberdavemaster997-Jul-13 16:38 
GeneralMy vote of 2 Pin
GregoryW29-Apr-13 0:26
memberGregoryW29-Apr-13 0:26 
QuestionCan't Browse at CP Pin
Alan Burkhart22-Apr-13 14:33
memberAlan Burkhart22-Apr-13 14:33 
AnswerRe: Can't Browse at CP Pin
SteveQ5622-Apr-13 22:33
memberSteveQ5622-Apr-13 22:33 
GeneralRe: Can't Browse at CP Pin
radioman.lt22-Apr-13 22:35
memberradioman.lt22-Apr-13 22:35 
GeneralRe: Can't Browse at CP Pin
Alan Burkhart23-Apr-13 14:06
memberAlan Burkhart23-Apr-13 14:06 
GeneralMy vote of 5 Pin
Prasad Khandekar16-Apr-13 10:15
memberPrasad Khandekar16-Apr-13 10:15 
QuestionHow to cache maps? Pin
S.Faizan.Ali15-Apr-13 20:34
memberS.Faizan.Ali15-Apr-13 20:34 
AnswerRe: How to cache maps? Pin
radioman.lt16-Apr-13 1:22
memberradioman.lt16-Apr-13 1:22 
QuestionMapControl does not contain the properties of MapType and CurrentPosition Pin
jhyap858-Apr-13 16:20
memberjhyap858-Apr-13 16:20 
AnswerRe: MapControl does not contain the properties of MapType and CurrentPosition Pin
radioman.lt8-Apr-13 21:17
memberradioman.lt8-Apr-13 21:17 
GeneralRe: MapControl does not contain the properties of MapType and CurrentPosition Pin
jhyap858-Apr-13 22:18
memberjhyap858-Apr-13 22:18 
GeneralRe: MapControl does not contain the properties of MapType and CurrentPosition Pin
radioman.lt8-Apr-13 23:23
memberradioman.lt8-Apr-13 23:23 
GeneralRe: MapControl does not contain the properties of MapType and CurrentPosition Pin
jhyap859-Apr-13 4:14
memberjhyap859-Apr-13 4:14 
GeneralRe: MapControl does not contain the properties of MapType and CurrentPosition Pin
jhyap859-Apr-13 16:19
memberjhyap859-Apr-13 16:19 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web01 | 2.8.151126.1 | Last Updated 16 Apr 2013
Article Copyright 2009 by
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid