Data collection in ArcGIS for Windows Mobile

Data collection development involves a feature source to edit the datatable that receives the new feature, and a sketch to draw the new feature on the map display. The code below shows how to set a feature source, change the MapAction to addVertexSketchTool, and create an empty geometry based on the feature source type.

// Sets map action to add vertex sketch 
map1.MapAction = addVertexSketchTool1; 
// Selects the inspecton feature source to add features 
valveInspectionsLayer = mobileCache1.FeatureSources["Inspections"] as FeatureSource; 

if (valveInspectionsLayer == null)
  {
  throw new NullReferenceException("Could not find the specified featuresource");
  }
  switch (valveInspectionsLayer.GeometryType)
	  {
   case GeometryType.Polygon:
   		sketchGraphicLayer1.Geometry = new Polygon();
     break;
   case GeometryType.Polyline:
     sketchGraphicLayer1.Geometry = new Polyline();
     break;
   case GeometryType.Point:
     sketchGraphicLayer1.Geometry = new ESRI.ArcGIS.Mobile.Geometries.Point();
     break;
   case GeometryType.Multipoint:
     sketchGraphicLayer1.Geometry = new Multipoint();
     break;
   }

When the above code is executed, the mouse cursor can be used on the display to create a new feature.

The code below is used to signal that the data collection of the feature's geometry is completed. The process involves creating a new row for the feature data table, adding it to the table, assigning the geometry, and saving the table changes.

//Used to signal geometry has been created for new feature
private void map1_DoubleClick(object sender, EventArgs e) 
{  
  try 
  { 
    if (map1.MapAction != addVertexSketchTool1)
      return;
				FeatureDataTable fTable = valveInspectionsLayer.GetDataTable();
    // Creates a new row 
    FeatureDataRow newFeature = fTable.NewRow();
    //Sets the new geometry to the feature layer data table
    fTable.Rows.Add(editedFeature); 
    //Sets the new geometry to the geometry field 
    editedFeature[valveInspectionsLayer.GeometryColumnIndex] = sketchGraphicLayer1.Geometry;
    // Updates the feature layer data table 
    fTable.SaveInFeatureSource(); 
    // Cleans the sketch 
    sketchGraphicLayer1.Geometry = null; 
    //Now use selection to select new feature and modify
    map1.MapAction = selectionMapAction1;
  }
  catch (Exception ex)
  {
    MessageBox.Show("Invalid geometry. " + ex.ToString()); 
    // Cleans the invalid geometry
    sketchGraphicLayer1.Geometry = null;
  }
}

To add attributes to a new feature, use the feature data table the same way as when adding the geometry; it involves different columns or fields in the row.

Where to get the sample

Download the sample from ArcGIS.com DataCollection with ArcGIS for Windows Mobile.