C# mvvm绑定正在间歇性更新

我在datagrid下面的a页面上有一个计数器，我试图使用它来通知用户datagrid中有多少行，以及需要多少行（共900行）。正在更新有问题的文本框，但当更改每行的计数时，文本框将打开。在将400多行插入到datagrid后，它正在更新

模型属性：

    public string CountText
    {
        get
        {
            return countText;
        }
        set
        {
            countText = value;
            OnPropertyChanged("CountText");
        }
    }

wpf文本框：

    // wpf textbox
    <TextBox
         Margin="10,0,0,0" 
         x:Name="CountText" 
         Style="{StaticResource EtchedTextBoxWhiteOnBlack}" 
         Background="Transparent" 
         Height="50" Width="200" 
         FontSize="22" FontWeight="ExtraBold"
         Text="{Binding EventLogModel.CountText}" 
         TextAlignment="Center"
         HorizontalAlignment="Center" VerticalAlignment="Center"
         HorizontalContentAlignment="Center" VerticalContentAlignment="Center" />

更新模型中CountText属性的代码：

    // model property to which the textbox is bound
    public string CountText
    {
        get
        {
            return countText;
        }
        set
        {
            countText = value;
            OnPropertyChanged("CountText");
        }
    }

    // code snippet that is updating the datagrid and the string property to which the textbox is bound
    bool bContinue = true;
    int startIndex = 0;
    int chunkSize = 50;
    bool breset = EventLogSignalingEvent.Reset();
    ThreadPool.QueueUserWorkItem(GetNumberOfLogEntries, lp);
    bool bwait = EventLogSignalingEvent.WaitOne();

    count = 0;

    if (maxItems > 0)
                {
                    UpdateStatusDialog("Loading log data", string.Format("{0} items total found", maxItems));
                    CountText = string.Format("{0} of {1}", count.ToString(), maxItems);
                }
                else
                {
                    statusOpen = false;
                    UpdateStatusDialog("No log data found", "");
                    StatusDlgHideEllipse();
                    CountText = string.Format("{0} items found", maxItems);
                }

                while (bContinue && !bStopped)
                {
                    EventLogSignalingEvent.Reset();
                    lp = new LogParams();
                    lp.chunkSize = chunkSize;
                    lp.eDate = eDate;
                    lp.sDate = sDate;
                    lp.startIndex = startIndex;
                    lp.UTCOffset = UTCOffset;
                    ThreadPool.QueueUserWorkItem(GetEventLogChunk, lp);
                    EventLogSignalingEvent.WaitOne();

                    if (chunk != null && chunk.Count > 0)
                    {
                        foreach (LogRecordDbMVVM db in chunk)
                        {
                            MainWindow.MainWinDispatcher.Invoke(DispatcherPriority.Send, new ThreadStart(() =>
                            {
                                try
                                {
                                    EventLog.Add(LogRecordGUI.LogRecord_DBtoGUI(db));
                                    Thread.Sleep(10);
                                }
                                catch
                                {
                                }
                            }));

                            if (statusOpen == true)
                            {
                                CloseStatusDialog();
                                statusOpen = false;
                            }

                            if (count < maxItems)
                            {
                                count++;
                                ThreadPool.QueueUserWorkItem(UpdateCount, count);
                                //CountText = string.Format("{0} of {1}", count.ToString(), maxItems);
                            }
                        }
                    }
                    else if (chunk == null)
                    {
                        log.Info("############################################### ERROR: chunk == null");
                        log.InfoFormat("Start date = {0} End date = {1} Start index = {2} chunkSize = {3} maxItems = {4}", sDate, eDate, startIndex, chunkSize, maxItems);
                    }

                    startIndex += chunkSize;
                    bContinue = (startIndex >= maxItems) ? false : true;

                }

                EventLogViewCount = (EventLog.Count - NumberOfEventLogItemsInView) >= 0 ? EventLog.Count - NumberOfEventLogItemsInView : 0;
            }
            catch (Exception ex)
            {
                log.ErrorFormat("{0} {1}", ex.Message, ex.StackTrace);
            }
        }
        catch (Exception ex)
        {
            log.ErrorFormat("{0} {1}", ex.Message, ex.StackTrace);
        }
    }

    private void UpdateCount(object context)
    {
        int count = (int)context;

        CountText = string.Format("{0} of {1}", count.ToString(), maxItems);
    }

    private void GetNumberOfLogEntries(object context)
    {
        LogParams lp = (LogParams)context;
        maxItems = BT220.ManagementService.GetEventLogCountChunk(lp.sDate, lp.eDate, lp.UTCOffset, lp.startIndex, lp.chunkSize);
        EventLogSignalingEvent.Set();
    }

---

我在这里看不到任何问题。。。您在寻求什么帮助？基础值的更新速度可能太快，UI线程没有机会运行。我的问题是，为什么在将每条记录添加到datagrid时计数没有得到更新？计数大约每300个条目更新一次。