public static IQueryOperationBuilder <T> AddObjectField <T, TProperty>(this IQueryOperationBuilder <T> builder,
                                                                        string alias, Expression <Func <T, TProperty> > expression,
                                                                        ISelectionSet <TProperty> selectionSet)
     where T : class
     where TProperty : class
 {
     return(builder.AddObjectField(alias, expression, null, selectionSet));
 }
 public static IQueryOperationBuilder <T> AddObjectField <T, TProperty>(this IQueryOperationBuilder <T> builder,
                                                                        Expression <Func <T, TProperty> > expression, IArgumentCollection arguments,
                                                                        ISelectionSet <TProperty> selectionSet)
     where T : class
     where TProperty : class
 {
     return(builder.AddObjectField(null, expression, arguments, selectionSet));
 }