New Post: dictionary returns undefined

publicstatic PropertyBag Create(string url) {
    var props = new PropertyBag();
    var q = new Uri("htt://localhost/" + url).Query;
    foreach (var qi in q.Split(new[] { '&', '?' }, StringSplitOptions.RemoveEmptyEntries)) {
        var s = qi.Split('=');
        props.Add(s[0], s[1]);
    }
    return props;
}

engine.AddHostObject("_GET", Create("qux.html?foo=123&bar=456&baz=789"));
engine.AddHostType("Console", typeof(Console));
engine.Execute(@"
    Console.WriteLine(_GET['foo']); // prints '123'
    Console.WriteLine(_GET['bar']); // prints '456'
    Console.WriteLine(_GET['baz']); // prints '789'
");