How to get a map layer's attribute values in a stand-alone mobile app?

Question

I am developing a stand-alone application with Mobile SDK 9.3.1. The application does not use a database.

How could I list the values of a certain map layer's attribute (table row values) in my application?
I am using a locally stored mapcache. I am able to retrieve the names of the attributes (column names) with the following piece of code:

ESRI.ArcGIS.Mobile.MobileServices.FeatureLayer layer = this.mobileService.Layers[0] as ESRI.ArcGIS.Mobile.MobileServices.FeatureLayer; 
DataTable table = layer.GetDataTable();
 foreach (DataColumn column in table.Columns)
 Debug.WriteLine(column.ToString());

However, I have not been able to get the rows of the columns and their content data with table.Rows.
Also, table.Rows.Count returns 0, even though the attribute table does have values (checked with ArcMap), and the corresponding items are displayed on the mobile map.

What am I doing wrong?

TanjaKantola · Answer

Hi!

Thank you all for the replies! They helped to solve the issue 🙂

MaxGlas · Answer

I had the same issue. When I sent in a blank new queryfilter it worked. Try:
DataTable table = layer.GetDataTable(new QueryFilter);

Or you use a null parameter to get all data:FeatureDataTable table = layer.GetDataTable(null);

For not selecting all data it is good to use the QueryFilter
QueryFilter queryFilter1 = new QueryFilter(string.Format("ID = {0} AND JAHR = {1}", id, jahr), true);
FeatureDataTable table = layer.GetDataTable(queryFilter1);

For selecting data by geometry:
QueryFilter queryFilter2 = new QueryFilter();
queryFilter2.Geometry = _aktGeom.GetExtent();
queryFilter2.GeometricRelationship = GeometricRelationshipType.Intersect;
FeatureDataTable table = layer.GetDataTable(queryFilter2);

AngelGonzalez · Answer

Instead of using:

DataTable table = layer.GetDataTable(); use FeatureDataTable table = layer.GetDataTable();

then assign it as the source of your datagrid:

dataGridView1.DataSource = table;