Select By Location in ArcGIS using C#?

Question

I am creating a tool which the user will select point or line features from the map and it will display their names in a list then after clicking on any of these features from the list, it will show the intersected polygons in another list.

The problem that I don't know how to do a SpatialFilter to do this intersecting functionality, which it will be done like the one in the Select By Location tool.

Answer 1

Please have a look IFeatureClass.Search Method

To get feature by mouse click:

public List<IFeature> Search(IPoint mousePoint, double buffer, IFeatureClass featureClass)
{
    var envelope = mousePoint.Envelope;
    envelope.Expand(buffer, buffer, false);
    var geodataset = (IGeoDataset)featureClass;
    string shapeFieldName = featureClass.ShapeFieldName;
    Geodatabase.ISpatialFilter spatialFilter = new Geodatabase.SpatialFilter();
    spatialFilter.Geometry = envelope;
    spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelCrosses;
    spatialFilter.set_OutputSpatialReference(shapeFieldName, geodataset.SpatialReference);

    Geodatabase.IFeatureCursor featureCursor = ArcFeatureClass.Search(spatialFilter, false);

    var features = new List<IFeature>();
    Geodatabase.IFeature feature;
    while ((feature = featureCursor.NextFeature()) != null)
        features.Add(new Feature(feature));
    return features;
}