SelectFeature for a FeatureCollectionLayer?

MikeBrownNCDOT

I have a collection of features that I create in code to mimic as if my data had a FeatureLayer. I have the Features properly showing up on the map and I can even identify the feature when tapped and output the data from the backing fields. However, I don't see any of the Select methods that are used in FeatureLayers. I prodded around and did find a hack to get to the method call:

var identifyResults = await MyMapView.IdentifyLayerAsync(MyFeatureCollectionLayer, tapScreenPoint, pixelTolerance, onlyReturnPopups, maximumResults);

var fcl = identifyResults.SublayerResults.FirstOrDefault();
if (fcl != null)
{
        foreach (Esri.ArcGISRuntime.Data.GeoElement idElement in fcl.GeoElements)
        {
            Esri.ArcGISRuntime.Data.Feature idFeature = idElement as Esri.ArcGISRuntime.Data.Feature;

            //fcl.SelectFeature(idFeature); // No methods for selection!!!

            MyFeatureCollectionLayer.FeatureCollection.Tables[0].FeatureLayer.SelectFeature(idFeature);

            CalloutDefinition callout = new CalloutDefinition(idFeature.Attributes["Number"].ToString(), idFeature.Attributes["Location"].ToString());
            MyMapView.ShowCalloutAt(e.Location, callout);
        }
}

However, if I get a reference to that FeatureLayer and try to perform the same IdentifyLayerAsync it won't return any results. Should/will FeatureCollectionLayers have a SelectFeature() method?  Am I using the wrong tooling (for adding POCO data to a map)? I had tried doing this with a GraphicsOverlay but ran into issues with interacting with the data -queries, filters, etc.

MaraStoica4

Hi Mike,

I ran your code with a couple of small modifications on a FeatureCollectionLayer I created and it selects without issues. See below please.

<SPAN class="keyword token">private</SPAN> <SPAN class="keyword token">async</SPAN> <SPAN class="keyword token">void</SPAN> <SPAN class="token function">MapView_GeoViewTapped</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">object</SPAN> sender<SPAN class="punctuation token">,</SPAN> Esri<SPAN class="punctuation token">.</SPAN>ArcGISRuntime<SPAN class="punctuation token">.</SPAN>UI<SPAN class="punctuation token">.</SPAN>Controls<SPAN class="punctuation token">.</SPAN>GeoViewInputEventArgs e<SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="comment token">// get reference to MapView</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">var</SPAN> mapView <SPAN class="operator token">=</SPAN> sender <SPAN class="keyword token">as</SPAN> MapView<SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="comment token">// get the first operational layer in the map (I only added one layer so this should find the layer I'm looking for)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">var</SPAN> layer <SPAN class="operator token">=</SPAN> mapView<SPAN class="punctuation token">.</SPAN>Map<SPAN class="punctuation token">.</SPAN>OperationalLayers<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="keyword token">as</SPAN> FeatureCollectionLayer<SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="comment token">// get the tap location in screen units</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">var</SPAN> tapScreenPoint <SPAN class="operator token">=</SPAN> e<SPAN class="punctuation token">.</SPAN>Position<SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="comment token">// set identify parameters</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">var</SPAN> pixelTolerance <SPAN class="operator token">=</SPAN> <SPAN class="number token">100</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">var</SPAN> returnPopupsOnly <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">false</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">var</SPAN> maxResultCount <SPAN class="operator token">=</SPAN> <SPAN class="number token">5</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>layer <SPAN class="operator token">!=</SPAN> <SPAN class="keyword token">null</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="comment token">// call the identify operation</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">var</SPAN> identifyResults <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">await</SPAN> mapView<SPAN class="punctuation token">.</SPAN><SPAN class="token function">IdentifyLayerAsync</SPAN><SPAN class="punctuation token">(</SPAN>layer<SPAN class="punctuation token">,</SPAN> tapScreenPoint<SPAN class="punctuation token">,</SPAN> pixelTolerance<SPAN class="punctuation token">,</SPAN> returnPopupsOnly<SPAN class="punctuation token">,</SPAN> maxResultCount<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="comment token">// get the layer containing the identify results</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">var</SPAN> fcl <SPAN class="operator token">=</SPAN> identifyResults<SPAN class="punctuation token">.</SPAN>SublayerResults<SPAN class="punctuation token">.</SPAN><SPAN class="token function">FirstOrDefault</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>fcl <SPAN class="operator token">!=</SPAN> <SPAN class="keyword token">null</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="comment token">// get every feature that was identified</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">foreach</SPAN> <SPAN class="punctuation token">(</SPAN>Esri<SPAN class="punctuation token">.</SPAN>ArcGISRuntime<SPAN class="punctuation token">.</SPAN>Data<SPAN class="punctuation token">.</SPAN>GeoElement idElement <SPAN class="keyword token">in</SPAN> fcl<SPAN class="punctuation token">.</SPAN>GeoElements<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="keyword token">var</SPAN> idFeature <SPAN class="operator token">=</SPAN> idElement <SPAN class="keyword token">as</SPAN> Feature<SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="comment token">// select feature</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;layer<SPAN class="punctuation token">.</SPAN>Layers<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">SelectFeature</SPAN><SPAN class="punctuation token">(</SPAN>idFeature<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="punctuation token">}</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="punctuation token">}</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN class="punctuation token">}</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>