How can I make a "Select by location" in PRO SDK

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02-26-2018 11:22 AM
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New Contributor II

I have been searching the samples and the API, but so far I have not been able to find any signs on how to make a "Select by Location" in C# With PRO-SDK.

Anyone out there that can point me in the right direction?

Regards

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Regular Contributor

Hi Rene,

You can use spatial filter on MCT thread:

// execute the select on the MCT

QueuedTask.Run(() =>

{

foreach(FeatureLayer pItem in pointLayers)

{

// define the spatial query filter

var spatialQuery = new SpatialQueryFilter() { FilterGeometry = geometry, SpatialRelationship = SpatialRelationship.Contains };

 

// gather the selection

var pointSelection = pItem.Select(spatialQuery);

}

}

If you want to do selection from the tool then you need to override OnSketchCompleteAsync event

protected override Task<bool> OnSketchCompleteAsync(Geometry geometry)

{

}

and add code above inside.

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New Contributor II

Hello,

I am trying to do a select by location (select the state (California, Florida, etc.) from a states polygon layer that polygon project boundary intersects with, and then zoom the map to that state. Would the code for this be similar to above? I cannot seem to figure out how to do this.

 

Thank you

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Esri Regular Contributor

You can also use GetFeatures to return features, as a dictionary, that intersect a search geometry.

    protected override Task<bool> OnSketchCompleteAsync(Geometry geometry)
    {

      return QueuedTask.Run(() =>
      {

        //create search polygon at 5 pixels
        var searchPoly = CreateSearchPolygon(geometry as MapPoint, 5);

        //find features under the search geometry
        var searchFeatures = MapView.Active.GetFeatures(searchPoly);

        return true;
      });
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Esri Regular Contributor

Here is another example that uses the selection from one feature class to select features in another feature class.

//"SelectByLocation" - Select Counties based on selected State polygon

Layout layout = LayoutView.Active.Layout;

await QueuedTask.Run(() =>
{
  MapFrame mf = layout.FindElement("Map Frame") as MapFrame;
  Map m = mf.Map;

  //Select a single state polygon
  FeatureLayer fl1 = m.FindLayers("State_Polygons").First() as FeatureLayer;
  QueryFilter queryFilter = new QueryFilter();
  string whereClause = "State_Name = 'Rhode Island'";
  queryFilter.WhereClause = whereClause;

  //Use a cursor to get to a feature's geometry
  using (ArcGIS.Core.Data.RowCursor rowCursor = fl1.Search(queryFilter))
  {
    //Grab the first record (and hopefully only record)
    while (rowCursor.MoveNext())
    {
      //Grab the features geometry
      Feature feature = rowCursor.Current as Feature;
      Geometry geo = feature.GetShape();

      //Set up a spatial query
      var spatialQuery = new SpatialQueryFilter()
      { FilterGeometry = geo, SpatialRelationship = SpatialRelationship.Intersects };

      //Reference county layer and apply spatial query
      FeatureLayer fl2 = m.FindLayers("Counties").First() as FeatureLayer;
      fl2.Select(spatialQuery);
    }
  }
});

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New Contributor II

Jeff, this worked great to select the county as in your example above! Now that I have the selected county, I just cannot figure out how to zoom the map to the selected county. 

I am using this, but it zooms to the entire layer, not just the selected feature within the layer.

var lyrExtent = fl2.QueryExtent();
mf.ZoomTo(lyrExtent);

Thank you so much for your help on this!

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Esri Regular Contributor

In the above code you already have the geometry of the selection feature.

Geometry geo = feature.GetShape();

So add these two lines to the bottom of the code above.

//Reference county layer and apply spatial query
FeatureLayer fl2 = m.FindLayers("Counties").First() as FeatureLayer;
fl2.Select(spatialQuery);
Envelope env = geo.Extent;
mf.ZoomTo(env);

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New Contributor II

Hmm, that seems to zoom to the state polygon, not the selected county polygon.

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New Contributor II

Is it possible to zoom to the selected county polygon, not the state polygon? 

Your help is much appreciated!

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New Contributor II

@Joshua - 

Could you use either of the following? 

ZoomToSelected Method 

https://pro.arcgis.com/en/pro-app/sdk/api-reference/index.html#topic12028.html 

ZoomToSelectedAsync Method

https://pro.arcgis.com/en/pro-app/sdk/api-reference/index.html#topic12029.html 

Good Luck! 

+ bill 

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