AFAIK, both AddFeatureProperty() and SetFilter() writes the internal
filter, and thus you cannot use both.
Also, there is no logical combination (should it be and, or, xor, nand
or nor?) for two properties like that.
You can get around it by setting the entire filter string like this:
SetFilter("ObjectType = 'MH' AND GEOMETRY INTERSECTS
GEOMFROMTEXT('POLYGON((1,1 2,2 1,1))')")
If you have an MgGeometry object, there are tools to read out the WKT
string for the geometry.
Regards, Kenneth Skovhede, GEOGRAF A/S
Scott Hameister skrev:
OK Here goes the scenario….
i have a map that already has a selction made in it that contains objects on
multiple layers… Pipes, CLs, and WaterNodes (points themed BY a field of
ObjectType MH, Valve etc.)
I need mapguide to return a list of values from the "NODEIDS" field for only
selected items on the “WaterNodes” Layer Where the field "ObjectType" =
‘MH’.
Ive gotten this to work by going crazy iterating through the feature reader
and a layerFilter….But this is really inefficient and I know it isnt this
difficult…
I’m plain out missing something when trying to incorporate
MgFeatureQueryOptions.SetFilter For filtering and
MgFeatureQueryOptions.AddFeatureProperty for Limiting the properties
returned?
It seems I should be able to use these two functionalities to make this code
much more streamlined without having to iterate a feature reader to loop
through each object in the layer and then loop through each field on the
object….Seems like I should be able to do this with no loops and no feature
reader going through every object but I keep getting stonewalled I know Im
just having a Mental block…Any takers willing to push me past this Brain
Freeze?
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