更改数据源后取消排序

Question

我有一个 silverlight 应用程序，它每 1 秒更改一次可观察集合，但发生的事情是，在您排序后，排序被取消了。我该如何解决？这每 1 秒发生一次：

private async void ClockTimerOnTick(object sender, EventArgs eventArgs)
{
    var allOpenTrades = await NewAPI.GetOpenTrades();
    var openLongTrades = allOpenTrades.Where(x => x.gameType == (int)GameType.LongTerm);
    LongTermModel.Open = new ObservableCollection<OpenTranasctionLongTerm>
    (openLongTrades.Select(x => new OpenTranasctionLongTerm
    {                   
        isPut = x.CallPutStatusId == 2,
        DateTraded = x.TransactionCreatedOn.ToLocalTime(),
        Expiration = x.optionExpirationTime.ToLocalTime(),
        Payout = x.OptionWinReturn,
        Security = x.OptionName,
        StrikePrice = x.TransactionQuote,
        Traded = x.Amount,
        Currency = UserCurrency,
        isCall = x.CallPutStatusId == 1,
        Type = x.CallPutStatusId == 1 ? "Call" : "Put"
    }).ToList());
}

Answer 1

正如我所看到的，您在每次计时器滴答时重置（创建一个新的可观察集合）您的集合，因此在我看来，DataGrid 的 ItemsSource 的 sort description 被清除。我认为如果将您的重新创建（创建新的可观察集合）代码替换为下一个代码，它将帮助您保留原始排序描述。

新的 ClockTimerOnTick 方法代码

    private void ClockTimerOnTick(object sender, EventArgs eventArgs)
    {
        var allOpenTrades = NewAPI.GetOpenTrades();
        var openLongTrades = allOpenTrades.Where(x => x.gameType == (int)GameType.LongTerm).ToList();
        //I'm assuming here that the LongTermModel.Open is an observable collection
        LongTermModel.Open.Clear();
        openLongTrades.ForEach(term =>
        {
            LongTermModel.Open.Add(new OpenTranasctionLongTerm
            {
                isPut = x.CallPutStatusId == 2,
                DateTraded = x.TransactionCreatedOn.ToLocalTime(),
                Expiration = x.optionExpirationTime.ToLocalTime(),
                Payout = x.OptionWinReturn,
                Security = x.OptionName,
                StrikePrice = x.TransactionQuote,
                Traded = x.Amount,
                Currency = UserCurrency,
                isCall = x.CallPutStatusId == 1,
                Type = x.CallPutStatusId == 1 ? "Call" : "Put"
            });
        });
    }

这里我们只是在每个计时器滴答时清除并重新填充 LongTermModel.Open 集合。

此致。

更改数据源后取消排序

Sorting is canceled after change datasource

silverlight

wpf

datagrid