How to define a custom Validation for a property in DevExpress?

Question

Please consider that I have in an entity a property

        public double RealVolume
        {
            get
            {
                return _RealVolume;
            }
            set
            {
                SetPropertyValue("RealVolume", ref _RealVolume, value);
            }
        }   

then I also have

        [Browsable(false)]
        public VolumeType VolumeOrVolumePoints
        {
            get
            {
                return WMSSystemSetting.Get_VolumeOrVolumePoints(Session);
            }
        }

I want that when VolumeOrVolumePoints == VolumeType.Volume then RealVolume to be validated as an integer otherwise validated as double number.

How could I achieve this? Thanks!

Answer 1

For information on how to validate an object with XPO, see here. If you happen to be using DevExpress XAF then use a ValidationRule from the ValidationModule instead.

So you need something like:

protected override void OnSaving() 
{
    if (VolumeOrVolumePoints == VolumeType.Volume)
    {
        if (RealVolume % 1 != 0) // see http://stackoverflow.com/a/2751597/1077279
             throw new Exception("The RealVolume value must be an integer when using Volume units.");
    }
}