//用于重新搜索全表
public static UniRx.IObservable <IReactiveCollection <T> > ObserveItemChanged <T>(this IReactiveCollection <T> reactCollection)
{
return(reactCollection.ObserveAdd().CombineLatest(reactCollection.ObserveRemove(), reactCollection.ObserveMove(), reactCollection.ObserveReplace(), reactCollection.ObserveReset(),
(add, remove, move, replace, reset) =>
{
return reactCollection;
}));
}