/// <summary>
/// Derived classes must implement this to save the option fields to the
/// query message passed.
/// </summary>
/// <param name="queryMsg">The target message.</param>
/// <remarks>
/// The derived class must store its values as <see cref="PropertyMsg" /> fields
/// using <b>"Option."</b> as the key prefix for each value's property name.
/// </remarks>
protected override void SaveTo(GeoQueryMsg queryMsg)
{
if (!MapBounds.IsEmpty)
{
queryMsg["Option.MapBounds"] = MapBounds.ToString();
}
if (ResolutionMiles.HasValue)
{
queryMsg["Option.ResolutionMiles"] = ResolutionMiles.Value.ToString();
}
}