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<title>Trouble Adding Existing Layers Programmatically </title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>You’re not saving the map back to
the Session.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Try something like this after you have
added the layercollection:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=green><span style='color:green'>'Create Identifier for the Session
Map<o:p></o:p></span></font></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=blue><span style='color:blue'>Dim</span></font>
l_oSessionResourceIdentifier <font color=blue><span style='color:blue'>As</span></font>
<font color=blue><span style='color:blue'>New</span></font>
MgResourceIdentifier(<font color=maroon><span style='color:maroon'>"Session:"</span></font>
& Session & <font color=maroon><span style='color:maroon'>"//"</span></font>
& MapName & <font color=maroon><span style='color:maroon'>".Map"</span></font>)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=green><span style='color:green'>'Save the Session Map<o:p></o:p></span></font></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>
l_oMap.Save(l_oResourceSrvc, l_oSessionResourceIdentifier)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>Kori <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>Kori Maleski<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>Senior Application Developer<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>WEBSOFT DEVELOPERS, INC.<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>P: (530) 759-8754 ext 114<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>F: (530) 759-0923<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>kori.maleski@websoftdev.com<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>________________________________</span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Buscher, Shane
[mailto:Shane.Buscher@nngco.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> December 20, 2006 8:37 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">users@mapguide.osgeo.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-users]
Trouble Adding Existing Layers Programmatically </span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I am overlooking saving the map back to
the session repository, which sounds like my problem. I’ll look
into this. Here’s the code if you have any other suggestions:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Dim</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> webConfig <font color=blue><span
style='color:blue'>As</span></font> <font color=blue><span style='color:blue'>String</span></font>
= Request.ServerVariables(<font color=maroon><span style='color:maroon'>"APPL_PHYSICAL_PATH"</span></font>)
& <font color=maroon><span style='color:maroon'>"webconfig.ini"<o:p></o:p></span></font></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>MapGuideApi.MgInitializeWebTier(webConfig)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>GetRequestParameters() <font
color=green><span style='color:green'>'gets mapName and sessionID<o:p></o:p></span></font></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=green
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:green'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Dim</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> userInfo <font color=blue><span
style='color:blue'>As</span></font> <font color=blue><span style='color:blue'>New</span></font>
MgUserInformation(sessionId)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Dim</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> siteConn <font color=blue><span
style='color:blue'>As</span></font> <font color=blue><span style='color:blue'>New</span></font>
MgSiteConnection<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>siteConn.Open(userInfo)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Dim</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> resourceService <font
color=blue><span style='color:blue'>As</span></font> MgResourceService =
siteConn.CreateService(MgServiceType.ResourceService)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>map.Open(resourceService,
mapName)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Dim</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> resId <font color=blue><span
style='color:blue'>As</span></font> <font color=blue><span style='color:blue'>New</span></font>
MgResourceIdentifier(<font color=maroon><span style='color:maroon'>"Library://VST_Prototype/Layers/SouthOmahaValves.LayerDefinition"</span></font>)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Dim</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> layerCollection <font
color=blue><span style='color:blue'>As</span></font> MgLayerCollection =
map.GetLayers()<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Dim</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> lyr <font color=blue><span
style='color:blue'>As</span></font> <font color=blue><span style='color:blue'>New</span></font>
MgLayer(resId, resourceService)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>layerCollection.Add(lyr)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>lyr.SetVisible(<font
color=blue><span style='color:blue'>True</span></font>)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>lyr.SetDisplayInLegend(<font
color=blue><span style='color:blue'>True</span></font>)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>lyr.ForceRefresh()</span></font><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<div style='margin-left:36.0pt'>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
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<p class=MsoNormal style='margin-left:36.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Jason
Birch [mailto:Jason.Birch@nanaimo.ca] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, December 20, 2006
9:18 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">users@mapguide.osgeo.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-users]
Trouble Adding Existing Layers Programmatically </span></font><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div id=idOWAReplyText97173>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Code might help with
diagnosis.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>You're saving the map
back to the session repository after adding the layer, right?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Jason<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div style='margin-left:36.0pt'>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
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<p class=MsoNormal style='mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:
12.0pt;margin-left:36.0pt'><b><font size=2 face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Buscher,
Shane<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wed 2006-12-20 5:48 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">users@mapguide.osgeo.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [mapguide-users] Trouble
Adding Existing Layers Programmatically </span></font><o:p></o:p></p>
</div>
<div>
<p style='margin-left:36.0pt'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>I have some layers that exist in my repository, but
aren’t added to the published map with Studio. </span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Instead,</span></font>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I want
end users to be able to add and remove these layers from the repository at
runtime. </span></font> <font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>I’m using the MgLayerCollection.Add method to
display layers, but they don’t show up in the map. According to the
developers guide, firing this method should automatically add a layer to the
map (p. 48). </span></font> <font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>The layers I’m trying to add</span></font>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>do get
added to the collection, but don’t display even after performing a
MgLayer.Visible=True and MgLayer.ForceRefresh. I am also</span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>calling the
Viewer API to refresh:</span></font> <font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>parent.mapFrame.Refresh(). </span></font><o:p></o:p></p>
<p style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>Anyone have any suggestions
or sample code? </span></font> <o:p></o:p></p>
<p style='margin-left:36.0pt'><a name=""><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Regards,</span></font></a><o:p></o:p></p>
<p style='margin-left:36.0pt'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Shane</span></font><o:p></o:p></p>
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