Did you instantiate an MgMap instance via the empty constructor, or the one
that takes an MgSiteConnection object?
Using the code that way requires your MgMap instance be initialized with a
MgSiteConnection object first.
Otherwise, you should be using the SelectFeatures() method of
MgFeatureService.
- Jackie
A H wrote:
>
> hello everyone, i'm quite new in MapGuide. i spent half of the day today
> because i can't get this filter to work.
>
> MgLayer areaLayer = GetLayerByName(map, "area");
>
> MgFeatureQueryOptions areaQuery = new MgFeatureQueryOptions();
> areaQuery.SetFilter("area_id like '%'");
>
> MgFeatureReader featureReader = areaLayer.SelectFeatures(areaQuery);
>
>
> i can get the areaLayer, but when i apply the filter, i got this message:
>
> Null reference.Null reference. Exception occurred in method
> MgMap.GetService at line 93 in file
> c:\build_bond_area\mapguide_open_source_v1.2\build_18.1\mgdev\common\mapguidecommon\MapLayer/Map.cpp
>
>
> the code was working for other parts of the system. but this time i'm
> trying to use the filter on this "area" layer, which is a permanent layer
> on the map. usually i use the filter on a temporary layer. i'm not sure
> whats the problem. i suspect its my filter text :(
>
> what i want to do with this later is get the geometry and redraw it on a
> temporary layer.
>
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