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

var explodeFeatures = new EditOperation() { 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
if (!explodeFeatures.IsEmpty)
{
  var result = explodeFeatures.Execute(); //Execute and ExecuteAsync will return true if the operation was successful and false if not
}

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