Unable to set membernames from custom validation attribute in MVC2

Question

I have created a custom validation attribute by subclassing ValidationAttribute. The attribute is applied to my viewmodel at the class level as it needs to validate more tha

Answer 1

When returning the validation result use the two parameter constructor. Pass it an array with the context.MemberName as the only value. Hope this helps

Public Class NonNegativeAttribute
Inherits ValidationAttribute
Public Sub New()


End Sub
Protected Overrides Function IsValid(num As Object, context As ValidationContext) As ValidationResult
    Dim t = num.GetType()
    If (t.IsValueType AndAlso Not t.IsAssignableFrom(GetType(String))) Then

        If ((num >= 0)) Then
            Return ValidationResult.Success
        End If
        Return New ValidationResult(context.MemberName & " must be a positive number",     New String() {context.MemberName})

    End If

    Throw New ValidationException(t.FullName + " is not a valid type. Must be a number")
End Function

End Class