private void AssociatedObjectPreviewInvoke(object sender, PreviewInvokeEventArgs e)
{
try {
var comparerType = typeof(Comparer <>).MakeGenericType(Lhs.GetType());
var defaultProperty = comparerType.GetTypeInfo().GetDeclaredProperty("Default");
var comparer = (IComparer)defaultProperty.GetValue(null);
var comparerResult = comparer.Compare(Lhs, System.Convert.ChangeType(Rhs, comparerType));
switch (CompareOperator)
{
case Op.Eq:
e.Cancelling = !(comparerResult == 0);
break;
case Op.Gt:
e.Cancelling = !(comparerResult > 0);
break;
case Op.GtEq:
e.Cancelling = !(comparerResult >= 0);
break;
case Op.Lt:
e.Cancelling = !(comparerResult < 0);
break;
case Op.LtEq:
e.Cancelling = !(comparerResult <= 0);
break;
}
} catch (Exception ex) {
Debug.WriteLine(ex);
e.Cancelling = true;
}
}