[RESOLVED] Help with Validation and CustomValidaor

[MrNorth]

Hi!


I have a very simple class

Customer


which has a property

public Orders as List(of Order)



The Order class has two properties


public amount as decimal

public validateAmount as boolean


I want to create a custom attribute that when I validate an Order, I want to do something like this:

if validateAmount then 

if amount < 10 then 

return new ValidationResult("The amount of this order is too small")
end if
return ValidationResult.Success
end if

The problem I have is, where do I put the custom attribute? On class level or on property level?

I also want the red rectangle around the textbox, but that indicates I must place the custom validator on property level, in the Order class. But there, I have no access to the ValidateAmount property, since the context of the custom validation is the field I place it on, not the object the field is contained in?


Do you have any advice? I feel like I have tried just about any combination possible...

/H

[dday9]

You should make your validateAmount a Public Shared Function:

Public Class Order
    Public Property Amount As Decimal

    Public Shared Function ValidateAmount(ByVal amount As Decimal) As Boolean
        If Order.ValidateAmount(foo.Amount) Then
            If foo.Amount < 10 Then
                Return New ValidationResult("The amount of this order is too small")
            End If

            Return ValidationResult.Success
        End If
    End Function
End Class

Then you can use it as such:

Dim foo As Order = New Order With {.Amount = 9}
Dim result As ValidationResult = Order.ValidateOrder(foo.Amount)