Search Query Always Returns Nothing

TingjunFan — Thu, 22 Sep 2016 23:46:07 GMT

I'm trying to search fields from the map (uri="http://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/2"). The web page reveals that it contains many fields such as the following:

Fields:

OBJECTID ( type: esriFieldTypeOID , alias: OBJECTID )
Shape ( type: esriFieldTypeGeometry , alias: Shape )
NAME ( type: esriFieldTypeString , alias: NAME , length: 32 )
STATE_NAME ( type: esriFieldTypeString , alias: STATE_NAME , length: 25 )
STATE_FIPS ( type: esriFieldTypeString , alias: STATE_FIPS , length: 2 )
CNTY_FIPS ( type: esriFieldTypeString , alias: CNTY_FIPS , length: 3 )
FIPS ( type: esriFieldTypeString , alias: FIPS , length: 5 )
POP2000 ( type: esriFieldTypeInteger , alias: POP2000 )
POP2007 ( type: esriFieldTypeInteger , alias: POP2007 )
POP00_SQMI ( type: esriFieldTypeDouble , alias: POP00_SQMI )
POP07_SQMI ( type: esriFieldTypeDouble , alias: POP07_SQMI )

However, when I try to use the following code to perform the search, I always get nothing (findResults.Results always null). Can someone please help me to identify where it went wrong? Many thanks (mapUri is the map Uri above).

private async Task MyQuery()

{

try

{

resultsGrid.Visibility = Visibility.Collapsed;

resultsGrid.ItemsSource = null;

FindTask findTask = new FindTask(mapUri);

var param = new FindParameters()

{

LayerIDs = new List<int> { 0, 1, 2 },

SearchFields = new List<string> { "STATE_NAME" },

ReturnGeometry = true,

SpatialReference = MyMapView.SpatialReference,

SearchText = "Colorado"

};

var findResults = await findTask.ExecuteAsync(param);

if ((findResults != null) && (findResults.Results != null) && (findResults.Results.Count > 0))

{

resultsGrid.ItemsSource = findResults.Results;

resultsGrid.Visibility = Visibility.Visible;

}

else

MessageBox.Show("Found Nothing!");

}

catch (Exception ex)

{

MessageBox.Show(ex.Message, "Find Sample");

}

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Search Query Always Returns Nothing

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