ValidationConstraintTObject Class

public abstract class ValidationConstraint<TObject> : Constraint<TObject>
where TObject : EditableDomainObject

Public MustInherit Class ValidationConstraint(Of TObject As EditableDomainObject)
	Inherits Constraint(Of TObject)

generic<typename TObject>
where TObject : EditableDomainObject
public ref class ValidationConstraint abstract : public Constraint<TObject>

[<AbstractClassAttribute>]
type ValidationConstraint<'TObject when 'TObject : EditableDomainObject> =  
    class
        inherit Constraint<'TObject>
    end

Type Parameters

TObject

The type of object to which the validation rule applies

IsValid/GetMessage is a constraint implementation pattern adequate for simple constraints.

With this pattern, the checking and the message generation are separated, which simplifies creating and maintaining simple constraints.

For complex constraints, which build the validation message during the check, it is advisable to inherit from different class. For example, multi-line constraints, which can return errors for multiple lines are better served with classes like ScriptedConstraintTObject.

Reference