Wpf WCF双工客户端空闲不会更新用户界面

我有一个客户机24/6连接到双工wcf服务，每个星期天重新启动。 在客户端中，iam使用listview显示一些信息。 listview itemssource绑定到自定义ObservableCollection。 客户端每分钟调用一个keepalive方法到wcf服务

我这里的问题是，当客户机中有活动时，客户机工作正常。但是当没有活动时，应用程序只运行keepalive方法大约10-16小时。我试图在listview中添加和删除数据，但似乎没有任何效果。但是记录方法add和remove的wcf服务工作正常。就像用户界面没有更新一样。当我重新启动应用程序时，一切正常

我如何解决这个问题

我的自定义ObservableCollection对象代码：

    public class ObservableOrderResponseQueue : INotifyCollectionChanged, IEnumerable<OrderResponse>
{
    public event NotifyCollectionChangedEventHandler CollectionChanged = (o, e) => { };
    private List<OrderResponse> _list = new List<OrderResponse>();

    /// <summary>
    /// Adds to the list.
    /// </summary>
    /// <param name="orderResponse">OrderResponse.</param>
    public void Add(OrderResponse orderResponse)
    {
        //Only 6 items in list is possible if more then 6 remove the first item.
        if (_list.Count >= 6)
        {
            RemoveAt(0);
        }

        this._list.Add(orderResponse);            

        CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, orderResponse, (_list.Count - 1)));
    }

    /// <summary>
    /// Remove from list.
    /// </summary>
    /// <param name="index">Item index to remove.</param>
    public void RemoveAt(int index)
    {
        OrderResponse order = this._list[index];
        this._list.RemoveAt(index);

        CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, order, index));
    }

    /// <summary>
    /// Remove from list.
    /// </summary>
    /// <param name="orderResponse">Item to be removed.</param>
    public void Remove(OrderResponse orderResponse)
    {
        if (_list.Count == 0) return;

        var item = _list.Where(o => o.OrderDetail.TrayCode == orderResponse.OrderDetail.TrayCode).FirstOrDefault();
        int index = _list.IndexOf(item);

        if (index == -1) return;

        CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item, index));

        this._list.RemoveAt(index);
    }

    #region IEnumerable<OrderResponse> Members

    public IEnumerator<OrderResponse> GetEnumerator()
    {
        return _list.GetEnumerator();
    }

    #endregion

    #region IEnumerable Members

    IEnumerator IEnumerable.GetEnumerator()
    {
        return _list.GetEnumerator();
    }

    #endregion


}

删除和添加方法

        void clientBack_RemoveFromDisplayEvent(object sender, RemoveFromDisplayEventArgs e)
    {
        try
        {
            _logger.Info("Remove from display.");

            userControlChairs.Dispatcher.Invoke((Action)(() =>
            {
                _queueProductionItems.Remove(e.OrderResponse);
            }));
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    void clientBack_AddToDisplayEvent(object sender, AddToDisplayEventArgs e)
    {
        try
        {
            _logger.Info("Add to display.");

            userControlChairs.Dispatcher.Invoke((Action)(() =>
            {
                _queueProductionItems.Add(e.OrderResponse);
            }));
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

---

谢谢你的帮助

我所做的是实现心跳机制。一切都解决了

        void clientBack_RemoveFromDisplayEvent(object sender, RemoveFromDisplayEventArgs e)
    {
        try
        {
            _logger.Info("Remove from display.");

            userControlChairs.Dispatcher.Invoke((Action)(() =>
            {
                _queueProductionItems.Remove(e.OrderResponse);
            }));
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    void clientBack_AddToDisplayEvent(object sender, AddToDisplayEventArgs e)
    {
        try
        {
            _logger.Info("Add to display.");

            userControlChairs.Dispatcher.Invoke((Action)(() =>
            {
                _queueProductionItems.Add(e.OrderResponse);
            }));
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }