topic Re: How to get a map layer's attribute values in a stand-alone mobile app? in ArcGIS for Windows Mobile Questions

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

TanjaKantola — Wed, 15 Sep 2010 13:41:15 GMT

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?

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

MelindaFrost — Wed, 15 Sep 2010 17:15:12 GMT

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

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

AngelGonzalez — Wed, 15 Sep 2010 17:30:07 GMT

Instead of using:

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

then assign it as the source of your datagrid:

dataGridView1.DataSource = table;

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

MaximilianGlas — Sun, 12 Dec 2021 01:42:16 GMT

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);

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

TanjaKantola — Fri, 24 Sep 2010 05:23:28 GMT

Hi!

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