public QueryHistoryProvider()
{
_historySourceList = new SourceList <RawQueryHistory>();
var counter = _historySourceList.CountChanged.Subscribe(i => IsEmpty = i == 0);
var limiter = _historySourceList.LimitSizeTo(100).Subscribe();
_historySourceList.AddRange(LoadFileData());
var sharedList = _historySourceList
.Connect()
.DeferUntilLoaded()
.Sort(SortExpressionComparer <RawQueryHistory> .Descending(t => t.LastRunAt))
.ObserveOnDispatcher()
.Bind(out _queryHistories)
.Subscribe();
var disposable = _queryHistories
.ObserveCollectionChanges()
.Throttle(TimeSpan.FromSeconds(2))
.Subscribe(pattern => { SaveFileData(_queryHistories); });
_compositeDisposable = new CompositeDisposable(counter, limiter, sharedList, disposable);
}
