Rock.Model.DefinedTypeService.GetByFieldTypeId C# (CSharp) Method

        public IOrderedQueryable<Rock.Model.DefinedType> GetByFieldTypeId( int? fieldTypeId )
        {
            return Queryable()
                .Where( t =>
                    ( t.FieldTypeId == fieldTypeId ||
                        ( fieldTypeId == null && t.FieldTypeId == null ) ) )
                .OrderBy( t => t.Order );
        }