public void Explode( 
   Layer layer,
   IEnumerable<long> oids,
   bool keepOriginalFeature
)

var explodeFeatures = new EditOperation();
explodeFeatures.Name = "Explode Features";

//Take a multipart and convert it into one feature per part
//Provide a list of ids to convert multiple
explodeFeatures.Explode(featureLayer, new List<long>() { oid }, true);

//Execute to execute the operation
//Must be called within QueuedTask.Run
explodeFeatures.Execute();

//or use async flavor
//await explodeFeatures.ExecuteAsync();