namespace Microsoft.UI.Xaml.Controls
{
    [ContractVersion(typeof(WinUIContract), 65536U)]
    [DefaultMember("ListItem")]
    [ProjectedRuntimeClass(typeof(IObservableVector<object>))]
    [WindowsRuntimeHelperType(typeof(ItemCollection))]
    [WindowsRuntimeType("Microsoft.UI.Xaml")]
    public sealed class ItemCollection : ICollection<object>, IEnumerable<object>, IList<object>, IEnumerable, IEquatable<ItemCollection>, ICustomQueryInterface, IDynamicInterfaceCastable, IObservableVector<object>, IWinRTObject
    {
        public int IndexOf(object item);
    }
}