public NumberRangeParameter(FieldType fieldType, string field, RangeOperators range, int value)
     : base(fieldType, field)
 {
     _range = range;
     _value = value;
 }
 public DateRangeParameter(FieldType fieldType, string field, RangeOperators range, DateTime value)
     : base(fieldType, field)
 {
     _range = range;
     _value = value;
 }