public IAttachedValidation Create(IStructuralItem modelItem,
IEnumerable <IAttribute> attributes)
{
// Enusre that the data type is a positive integer semantic
// type (or nullable positive integer)
if (!IsValid(modelItem))
{
throw new InvalidOperationException("Unsupported data type.");
}
return(new MaxIntegerValidation(attributes));
}
public bool IsValid(IStructuralItem modelItem)
{
INullableType nullableType = modelItem as INullableType;
// Get underlying type if it is an INullableType.
modelItem =
null != nullableType ? nullableType.UnderlyingType : modelItem;
// Ensure the type matches the business type,
// or the underlying type
while (modelItem is ISemanticType)
{
if (String.Equals(((ISemanticType)modelItem).Id,
"ApressExtensionCS:DurationType",
StringComparison.Ordinal))
{
return(true);
}
modelItem = ((ISemanticType)modelItem).UnderlyingType;
}
//Don't apply the validation if the conditions aren't met
return(false);
}