刷新Silverlight中的DataGrid

Question

我有DataGrid裏面有列。

我希望DataGrid爲每3秒刷新一次，其中包含來自服務的數據。

我需要的是Scroll不會跳轉到DataGrid的頂部，每次刷新的時間，留在同一個地方Scroll的。可能嗎？

這裏是我的代碼：

<sdk:DataGrid Grid.Row="1" FlowDirection="RightToLeft" ColumnHeaderHeight="32" 
     AutoGenerateColumns="False" Name="RealTimeReportDataGrid" 
     RowEditEnded="LinesDataGrid_RowEditEnded" RowHeight="40"> 
     <sdk:DataGrid.Columns>...</sdk:DataGrid.Columns> 
</sdk:DataGrid> 

這是後面的代碼：提前

 public RealTimeReport() 
    { 
     InitializeComponent(); 
     Loaded += OnViewLoaded; 
     RealTimeReportService.RealTimeReportServiceClient RTws = new RealTimeReportService.RealTimeReportServiceClient(); 
     RTws.GetRealTimeReportAsync(); 
     RTws.GetRealTimeReportCompleted += new EventHandler<RealTimeReportService.GetRealTimeReportCompletedEventArgs>(RTws_GetRealTimeReportCompleted); 

    } 

    void RTws_GetRealTimeReportCompleted(object sender, RealTimeReportService.GetRealTimeReportCompletedEventArgs e) 
    { 
     var t = e.Result.ToList(); 
     RealTimeReportDataGrid.ItemsSource = new System.Collections.ObjectModel.ObservableCollection<ShahalDialerRT.RealTimeReportService.RealTimeReport>(e.Result.ToList()); 
    } 


    private void OnViewLoaded(object sender, RoutedEventArgs e) 
    { 
     Start(); 
    } 

    private void OnUpdaterTimerTick(object sender, EventArgs e) 
    { 
     RealTimeReportService.RealTimeReportServiceClient RTws = new RealTimeReportService.RealTimeReportServiceClient(); 
     RTws.GetRealTimeReportAsync(); 
     RTws.GetRealTimeReportCompleted += new EventHandler<RealTimeReportService.GetRealTimeReportCompletedEventArgs>(RTws_GetRealTimeReportCompleted); 
    } 


    public void Start() 
    { 
     InitializeRefreshDataTimer(); 
    } 


    public void InitializeRefreshDataTimer() 
    { 
     _updaterTimer.Interval = new TimeSpan(0, 0, 0, 0, 3000); 
     _updaterTimer.Tick += OnUpdaterTimerTick; 
     _updaterTimer.Start(); 
    } 

感謝。

更新： @StepUp，這是我做出的唯一改變，根據你所說的話，但仍然沒有改變:(

void RTws_GetRealTimeReportCompleted(object sender, RealTimeReportService.GetRealTimeReportCompletedEventArgs e) 
{ 
    var t = e.Result.ToList(); 

    RealTimeReportDataGrid.ItemsSource = new System.Collections.ObjectModel.ObservableCollection<ShahalDialerRT.RealTimeReportService.RealTimeReport>(e.Result.ToList()); 

    this.RealTimeReportDataGrid.Dispatcher.BeginInvoke(() => 
    { 
     RealTimeReportDataGrid.ScrollIntoView(
     RealTimeReportDataGrid.SelectedItem, 
     RealTimeReportDataGrid.CurrentColumn); 
    }); 
    //RealTimeReportDataGrid.ItemsSource = new System.Collections.ObjectModel.ObservableCollection<ShahalDialerRT.RealTimeReportService.RealTimeReport>(e.Result.ToList()); 
    //RealTimeReportDataGrid.UpdateLayout(); 
    //RealTimeReportDataGrid.ScrollIntoView(RealTimeReportDataGrid.SelectedItem, RealTimeReportDataGrid.Columns[0]); 
} 

Answer 1

要刷新每3秒只是use Timer class：

System.Timers.Timer aTimer = new System.Timers.Timer(); 
aTimer.Elapsed+=new ElapsedEventHandler(OnTimedEvent); 
aTimer.Interval=3000; 
aTimer.Enabled=true; 


// Specify what you want to happen when the Elapsed event is raised. 
private static void OnTimedEvent(object source, ElapsedEventArgs e) 
{ 
    //add new data 
} 

Elapsed事件將在X秒數內上升，以毫秒爲單位，以Timer對象上的Interval屬性指定，它將調用Event Handler您指定的方法，在上面的示例中是OnTimedEvent。

爲了保持Scroll在同一位置DataGrid：

yourDataGrid.ItemsSource = data; 
yourDataGrid.UpdateLayout(); 
yourDataGrid.ScrollIntoView(theDataGrid.SelectedItem, theDataGrid.Columns[0]); 

更新：

yourDataGrid.Dispatcher.BeginInvoke(() => 
{ 
    yourDataGrid.Focus();  
    yourDataGrid.SelectedItem=whateverYouWant; 
    yourDataGrid.CurrentColumn=yourDataGrid.Columns[0]; 
    yourDataGrid.ScrollIntoView(yourDataGrid.SelectedItem, yourDataGrid.CurrentColumn); 
}); 

OR：

yourDataGrid.SelectedIndex = 5; // the index you want to select 
yourDataGrid.UpdateLayout(); 
yourDataGrid.ScrollIntoView(Grid.SelectedItem, 0);