[mapguide-users] Changing existing dynamic layer's Filter on the fly

[Maksim Sestic]

This layer removal thingy is funny. Could anyone, plese, explain what's going
on here?

=== This works:

Dim layerName as String = "TestLayer"
Dim map As MgMap = ...get active MgMap from session...

Dim layerCol As MgLayerCollection = map.GetLayers()
Dim layerToRemove As MgLayer = Nothing

For Each layerItem As MgLayer In layerCol
   If layerItem.Name = layerName Then
      layerToRemove = layerItem
      Exit For
   End If
Next

If layerToRemove IsNot Nothing Then
   layerCol.Remove(layerToRemove)
End If


=== But this won't work:

Dim layerName as String = "TestLayer"
Dim map As MgMap = ...get active MgMap from session...
Dim layer As MgLayer = map.GetLayers.GetItem(layerName)

Dim layerCol As MgLayerCollection = map.GetLayers()
Dim layerToRemove As MgLayer = Nothing

For Each layerItem As MgLayer In layerCol
   If layerItem.Name = layerName Then
      layerToRemove = layerItem
      Exit For
   End If
Next

If layerToRemove IsNot Nothing Then
   layerCol.Remove(layerToRemove)
End If

I don't get it, it throws "The specified object was not found" exception.

Regards,
Maksim Sestic
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