[mapguide-users] new layer is not in the mapimage

[pribram]

Hi,
What I would like to do:
- remove all layers from the map in session
- change the xml definition for a layer and save it to session repository
(remove the mMaxScale tag)
- add the new layer to the map in session repository
- use this map by getmapimage request

What's my problem:
when running the code bellow and then trying to get image by getmapimage
request to mapagent, the image is empty. I have tryied to loop through the
maplayers in the map - the layer with the correct definition is there.

What's wrong here?

Thank's a lot for any idea.

MapGuideApi.MgInitializeWebTier(mgExtPath + "\\webconfig.ini");

string sessionId = null;
bool createSession = true;
MgUserInformation mgUserInfo;

//
mgUserInfo = new MgUserInformation();
if (sessionId != "" && sessionId != null)
{
	mgUserInfo.SetMgSessionId(sessionId);
	createSession = false;
}
else
{
	mgUserInfo.SetMgUsernamePassword("Anonymous", "");
}

//
if (createSession)
{
	MgSite mgSiteTmp = new MgSite();
	mgSiteTmp.Open(mgUserInfo);
	sessionId = mgSiteTmp.CreateSession();
}

//
mgUserInfo = new MgUserInformation(sessionId);
MgSiteConnection mgSite = new MgSiteConnection();
mgSite.Open(mgUserInfo);
MgResourceService mgResSrvc =
(MgResourceService)mgSite.CreateService(MgServiceType.ResourceService);

//
MgMap mgMapLib = new MgMap();
MgResourceIdentifier mgResIdMapInit = new MgResourceIdentifier(mapRes);
string mapNameInit = mgResIdMapInit.GetName();
mgMapLib.Create(mgResSrvc, mgResIdMapInit, mapNameInit);

//
MgSelection mgSelTmp = new MgSelection(mgMapLib);
mgSelTmp.Save(mgResSrvc, mapNameInit);

//
MgResourceIdentifier mgResIdMapSess = new MgResourceIdentifier("Session:" +
sessionId + "//" + mapNameInit + "." + MgResourceType.Map);
mgMapLib.Save(mgResSrvc, mgResIdMapSess);

//
MgMap mgMapSess = new MgMap();
mgMapSess.Open(mgResSrvc, mgResIdMapSess);

//
MgLayerCollection mgLays = null;
MgLayer mgAcvLay = null;
MgResourceIdentifier mgResIdAcvLay = null;
string acvLayName = "";

mgLays = mgMapSess.GetLayers();
int cntLay = 0;
foreach (MgLayer mgLay in mgLays)
{
	if (cntLay == layOrder)
	{
		mgLay.Visible = true;
		mgResIdAcvLay = mgLay.GetLayerDefinition();
		acvLayName = mgLay.Name;
		mgAcvLay = mgLay;
	}
	cntLay++;
}

mgLays.Clear();
mgMapSess.Save(mgResSrvc);

if (mgAcvLay != null)
{
	//
	MgByteReader mgByteReader = mgResSrvc.GetResourceContent(mgResIdAcvLay);
	String mapDefString = mgByteReader.ToString();
	XmlDocument xmlDoc = new XmlDocument();
	xmlDoc.LoadXml(mapDefString);

	//
	XmlNodeList xmlScaleRanges =
xmlDoc.GetElementsByTagName("VectorScaleRange");
	if (xmlScaleRanges.Count == 0)
	{
		xmlScaleRanges = xmlDoc.GetElementsByTagName("GridScaleRange");
		if (xmlScaleRanges.Count == 0)
		{
			xmlScaleRanges = xmlDoc.GetElementsByTagName("DrawingLayerDefinition");
		}
	}

	//
	for (int i = 0; i < xmlScaleRanges.Count; i++)
	{
		XmlElement xmlScaleRange = (XmlElement)xmlScaleRanges[i];
		XmlNodeList xmlMaxScale = xmlScaleRange.GetElementsByTagName("MaxScale");
		if (xmlMaxScale.Count > 0)
		{
			xmlScaleRange.RemoveChild(xmlMaxScale[0]);
		}
	}
	string xmlOut = xmlDoc.OuterXml;

	//
	MgByteSource mgByteSrc = new MgByteSource(Encoding.UTF8.GetBytes(xmlOut),
xmlOut.Length);
	mgByteSrc.SetMimeType(MgMimeType.Xml);
	MgByteReader mgByteReaderOut = mgByteSrc.GetReader();
	MgResourceIdentifier mgResIdAcvLaySess = new
MgResourceIdentifier("Session:" + sessionId + "//" + acvLayName + "." +
MgResourceType.LayerDefinition);
	mgResSrvc.SetResource(mgResIdAcvLaySess, mgByteReaderOut, null);

	//
	MgLayer mgNewLay = new MgLayer(mgResIdAcvLaySess, mgResSrvc);
	mgNewLay.SetName("aaaaa");
	mgNewLay.SetVisible(true);
	mgNewLay.SetLegendLabel("");
	mgNewLay.DisplayInLegend = true;
	//mgNewLay.ForceRefresh();
	mgLays = mgMapSess.GetLayers();
	mgLays.Insert(0, mgNewLay);

	mgMapSess.Save(mgResSrvc);

	mgLays = mgMapSess.GetLayers();
}
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