private async Task Update(CancellationToken ct)
{
var t = RefreshTimeSpan;
try
{
while (!ct.IsCancellationRequested)
{
var addlist = new List <TransactionRecentInfo>();
var deletelist = new List <TransactionRecentInfo>();
var s = _stockAgent.GetRecentTrans(_stockInfoViewModel.CurrentStockInfo.StockId, RecentNum);
lock (this)
{
s.ForEach(x =>
{
var ss = TransactionRecentInfoList.FirstOrDefault(y => y.TranId == x.TranId);
if (ss != null)
{
return;
}
var si = new TransactionRecentInfo();
si.Create(x);
addlist.Add(si);
});
TransactionRecentInfoList.ForEach(x =>
{
var ss = s.FirstOrDefault(y => y.TranId == x.TranId);
if (ss == null)
{
deletelist.Add(x);
}
});
addlist.ForEach(x => TransactionRecentInfoList.Add(x));
deletelist.ForEach(x => TransactionRecentInfoList.Remove(x));
TransactionRecentInfoList = TransactionRecentInfoList.OrderByDescending(x => x.CreateDateTime).ToList();
}
await Task.Delay(t, ct);
}
}
catch (Exception e)
{
if (!ct.IsCancellationRequested)
{
await _dialogService.ShowError(e, "错误", "确定", null);
}
}
}
public TransactionRecentInfoViewModel(StockAgent stockAgent, IDialogService dialogService, StockInfoViewModel stockInfoViewModel)
{
_stockAgent = stockAgent;
_dialogService = dialogService;
_stockInfoViewModel = stockInfoViewModel;
Messenger.Default.Register <GenericMessage <bool> >(this, UpdateTransactionRecentInfo, b =>
{
lock (this)
{
if (b.Content && _updateTransactionRecentInfo == null)
{
_cts = new CancellationTokenSource();
_updateTransactionRecentInfo = Update(_cts.Token);
}
else if (!b.Content && _cts != null && _updateTransactionRecentInfo != null)
{
_cts.Cancel();
_updateTransactionRecentInfo = null;
TransactionRecentInfoList.Clear();
}
}
});
}
