Query Task to output statisics

Hi,

Has anyone used the Out Statistics in QueryTask workflow to query for summarized data? I want to find the maximum value in one column. I am trying to list "Group By Fields for Statistics" and "Out Fields" but it isn't working. Workflow posted below isn't crashing, it's just not grouping the data.

Thanks!

<Activity mc:Ignorable="sap" x:Class="{x:Null}" sap:VirtualizedContainerService.HintSize="392,1238" mva:VisualBasic.Settings="Assembly references and imported namespaces serialized as XML namespaces" xmlns="http://schemas.microsoft.com/netfx/2009/xaml/activities" xmlns:eac="clr-namespace:ESRI.ArcGIS.Client;assembly=ESRI.ArcGIS.Client" xmlns:eacg="clr-namespace:ESRI.ArcGIS.Client.Geometry;assembly=ESRI.ArcGIS.Client" xmlns:eact="clr-namespace:ESRI.ArcGIS.Client.Tasks;assembly=ESRI.ArcGIS.Client" xmlns:esri="http://schemas.esri.com/arcgis/client/2009" xmlns:gce="clr-namespace:Geocortex.Core.Extensions;assembly=Geocortex.Core" xmlns:gfc="clr-namespace:Geocortex.Forms.Client;assembly=Geocortex.EssentialsWpfApi" xmlns:gfci="clr-namespace:Geocortex.Forms.Client.Items;assembly=Geocortex.EssentialsWpfApi" xmlns:gr="clr-namespace:Geocortex.Reporting;assembly=Geocortex.Reporting" xmlns:gwa="clr-namespace:Geocortex.Workflow.Activities;assembly=Geocortex.Workflow" xmlns:gwa1="clr-namespace:Geocortex.Workflow.Activities;assembly=Geocortex.Workflow.Activities" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:mva="clr-namespace:Microsoft.VisualBasic.Activities;assembly=System.Activities" xmlns:s="clr-namespace:System;assembly=System.Core" xmlns:s1="clr-namespace:System;assembly=System" xmlns:s2="clr-namespace:System;assembly=mscorlib" xmlns:s3="clr-namespace:System;assembly=System.ServiceModel" xmlns:s4="clr-namespace:System;assembly=System.Web.Services" xmlns:sa="clr-namespace:System.Activities;assembly=System.Activities" xmlns:sap="http://schemas.microsoft.com/netfx/2009/xaml/activities/presentation" xmlns:scg="clr-namespace:System.Collections.Generic;assembly=System.Core" xmlns:scg1="clr-namespace:System.Collections.Generic;assembly=System" xmlns:scg2="clr-namespace:System.Collections.Generic;assembly=mscorlib" xmlns:scg3="clr-namespace:System.Collections.Generic;assembly=System.ServiceModel" xmlns:sl="clr-namespace:System.Linq;assembly=System.Core" xmlns:sw="clr-namespace:System.Windows;assembly=PresentationFramework" xmlns:sw1="clr-namespace:System.Windows;assembly=WindowsBase" xmlns:sw2="clr-namespace:System.Windows;assembly=PresentationCore" xmlns:swt="clr-namespace:System.Windows.Threading;assembly=WindowsBase" xmlns:swt1="clr-namespace:System.Windows.Threading;assembly=System.Windows.Presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

 

  <Sequence sap:VirtualizedContainerService.HintSize="352,1198" mva:VisualBasic.Settings="Assembly references and imported namespaces serialized as XML namespaces">

 

    <Sequence.Variables>

 

      <Variable x:TypeArguments="x:String" Default="http://servername/rdosgis/rest/services/servicename/FeatureServer/3" Name="feeFeatureLayerURL" />

 

      <Variable x:TypeArguments="x:String" Name="theToken" />

 

      <Variable x:TypeArguments="esri:FeatureSet" Name="featureset" />

 

      <Variable x:TypeArguments="scg2:IList(esri:OutStatistic)" Name="listStatisticsFields" />

 

      <Variable x:TypeArguments="scg2:IList(x:String)" Name="listGroupByFields" />

 

      <Variable x:TypeArguments="x:String" Default="username" Name="un" />

 

      <Variable x:TypeArguments="x:String" Default="password" Name="pwd" />

 

      <Variable x:TypeArguments="x:String" Default="http://servername/rdosgis/tokens/?" Name="tokenServiceURL" />

 

      <Variable x:TypeArguments="x:String" Default="MaxID" Name="outFields" />

 

      <Variable x:TypeArguments="x:String" Default="ID" Name="fieldName" />

 

      <Variable x:TypeArguments="esri:OutStatistic" Default="[new OutStatistic(&quot;ID&quot;,&quot;MaxID&quot;,StatisticType.Max)]" Name="outStatistic" />

 

    </Sequence.Variables>

 

    <sap:WorkflowViewStateService.ViewState>

 

      <scg2:Dictionary x:TypeArguments="x:String, x:Object">

 

        <x:Boolean x:Key="IsExpanded">True</x:Boolean>

 

      </scg2:Dictionary>

 

    </sap:WorkflowViewStateService.ViewState>

 

    <gwa1:GenerateToken Expiration="10" sap:VirtualizedContainerService.HintSize="330,197" Password="[pwd]" Token="[theToken]" TokenServiceUrl="[tokenServiceURL]" UserName="[un]" />

 

    <gwa1:CreateList x:TypeArguments="esri:OutStatistic" sap:VirtualizedContainerService.HintSize="330,59" Result="[listStatisticsFields]" />

 

    <gwa1:InsertIntoList x:TypeArguments="esri:OutStatistic" sap:VirtualizedContainerService.HintSize="330,105" Index="0" Item="[outStatistic]" List="[listStatisticsFields]" />

 

    <gwa1:CreateList x:TypeArguments="x:String" sap:VirtualizedContainerService.HintSize="330,59" Result="[listGroupByFields]" />

 

    <gwa1:InsertIntoList x:TypeArguments="x:String" sap:VirtualizedContainerService.HintSize="330,105" Index="0" Item="[fieldName]" List="[listGroupByFields]" />

 

    <gwa1:QueryTask GroupByFieldsForStatistics="[listGroupByFields]" sap:VirtualizedContainerService.HintSize="330,227" OutFields="[outFields]" OutStatistics="[listStatisticsFields]" QueryServiceUrl="[feeFeatureLayerURL]" Results="[featureset]" SpatialRelationship="esriSpatialRelIntersects" Token="[theToken]" />

 

    <gwa1:Alert sap:VirtualizedContainerService.HintSize="330,82" Text="[&quot;Count: &quot; &amp; featureset.Features.Count() &amp; &quot; MaxID: &quot; &amp; featureset.Features(0).Attributes(&quot;MaxID&quot;).ToString()]" Title="Success" />

 

  </Sequence>

 

</Activity>