[mapguide-users] prob with GetSelectionXml()

[saloua wakrim]

thanks for your reply but it's same in vb.net even i do count() it gives the
same error

2009/5/26 Chris Claydon <chris.claydon at autodesk.com>

> I'm not too familiar with VB, but don't you need to call Layers.GetCount()
> (i.e. using brackets (), since it's a method)?
>
> -----Original Message-----
> From: mapguide-users-bounces at lists.osgeo.org [mailto:
> mapguide-users-bounces at lists.osgeo.org] On Behalf Of
> wakrimsaloua.wakrim at gmail.com
> Sent: Tuesday, May 26, 2009 9:14 AM
> To: mapguide-users at lists.osgeo.org
> Subject: [mapguide-users] prob with GetSelectionXml()
>
> hi all! i've prob with use the xml selection wich i get after user clic on
> polygone, this is javascript function i use to get selection:(i write it in
> textfiel and read it by Request.Form:
>
>  function test()
>    {
>
>  k= document.formulaire.classe.value=carte.GetMapFrame().GetSelectionXML();
>
>
>    }
>
> for get this selection i use this code
>
>  selectionXml = getValue("classe")
>
>
>  Private Function getValue(ByVal champ As String) As String
>        ' récupère la valeur du champ [champ] de la requête postée
>        ' qq chose ?
>        If Request.Form(champ) Is Nothing Then Return ""
>        ' on récupère la ou les valeurs du champ
>        Dim valeurs() As String = Request.Form.GetValues(champ)
>        Dim valeur As String = ""
>        Dim i As Integer
>        For i = 0 To valeurs.Length - 1
>            valeur += valeurs(i)
>        Next
>        valeur = Server.UrlDecode(valeur)
>
>        Return valeur
>    End Function
>
> after user clic on polygone and get xml selection , i use this code for
> filter and identify polygone ID:
>
>  Public Sub getselectionpartiel(ByVal map As MgMap, ByVal resourceService
> As MgResourceService, ByVal XmlSel As String)
>
>
>        Dim k = 0
>           If ((XmlSel <> Nothing) And (XmlSel <> "")) Then
>
>
>            Dim selection As New MgSelection(map, XmlSel)
>            Dim Layers As MgReadOnlyLayerCollection = selection.GetLayers()
>
>
>            If Not Layers.GetCount = 1 Then
>                Response.Write("More than one object was selected")
>
>                Exit Sub
>
>            End If
>
>
>
>
>
>
>            Response.Write("calques selectionnés")
>
>
>
>        End If
>
>    End Sub
>  and i call this function like that:
>    getselectionpartiel(map, resourceSrvc, selectionXml)
>
> it gives me this error:
>
> "La référence d'objet n'est pas définie à une instance d'un objet." in the
> line:
> (the object reference is not associated to the object instance)
>    If Not Layers.GetCount = 1 Then
>
> i think that Layers is empty but when i display "selectionXml" by using:
>
> Response.Write(selectionXml) it gives me the correct selection!!!
> if some one has some idea please tell it me, thanks a lot on advance
>
>
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