Ordering a collection of features

[Chad5]

I’ve been trying to sort/order a collection of features by a certain column value based on the layer selected. Any help/documentation on the this would be greatly appreciated.

Collection closestFeature = dataLayer.FeatureSource.GetFeaturesWithinDistanceOf(position, map.MapUnit, DistanceUnit.Feet, 500, dataLayerColumnNames as IEnumerable);

// code to fill the collection with features. // This works correctly

closestFeature.OrderByDescending(t => t.ColumnValues[“ColumnName”]);

//result does not order the collection

[Ethan]

Hi Chad,

As below is the test result, because the collection won’t keep the sort result, so you should want to call ToList to get the correct result.

InMemoryFeatureLayer layer = new InMemoryFeatureLayer();
Feature f1 = new Feature(0, 0);
f1.ColumnValues.Add(“ColumnName”, “2”);

        Feature f2 = new Feature(1, 1);
        f2.ColumnValues.Add("ColumnName", "1");

        Feature f3 = new Feature(2, 2);
        f3.ColumnValues.Add("ColumnName", "3");

        layer.InternalFeatures.Add(f1);
        layer.InternalFeatures.Add(f2);
        layer.InternalFeatures.Add(f3);

        layer.Open();
        Collection<Feature> features = layer.FeatureSource.GetFeaturesWithinDistanceOf(new PointShape(1, 0), GeographyUnit.DecimalDegree, DistanceUnit.Kilometer, 3000, ReturningColumnsType.AllColumns);

        var result1 = features.OrderByDescending(t => t.ColumnValues["ColumnName"]).ToList();
        var result2 = features.OrderByDescending(t => t.Id).ToList();

Or you can use IEnumberable instead of Collection like this:

        IEnumerable<Feature> features = layer.FeatureSource.GetFeaturesWithinDistanceOf(new PointShape(1, 0), GeographyUnit.DecimalDegree, DistanceUnit.Kilometer, 3000, ReturningColumnsType.AllColumns);

        features = features.OrderByDescending(t => t.ColumnValues["ColumnName"]);

Wish that’s helpful.

Regards,

Don