Question

我有两个datagrid' s（Master / detaiL）。我每隔5秒使用DispatcherTimer刷新一次窗口。当我选择主网格上的任何一行时，所选行的焦点仅保留5秒，之后选择焦点移动到最顶行。

如何在XAML中克服这个问题？

修改

 public partial class MyWindow : Window
{
    ProdEntities _prodEntities = new ProdEntities();

    public MyWindow()
    {
        InitializeComponent();
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        try
        {
            RebindData();
            SetTimer();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }

    private void SetTimer()
    {
        DispatcherTimer dispatcherTimer = new DispatcherTimer();
        dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
        dispatcherTimer.Interval = new TimeSpan(0, 0, 5);
        dispatcherTimer.Start();
    }

    protected void dispatcherTimer_Tick(object sender, EventArgs e)
    {
        RebindData();
    }

    private void RebindData()
    {
        CollectionViewSource serversViewSource = (CollectionViewSource)(FindResource("serversViewSource"));
        IQueryable<Server> serversQuery = this.GetServersQuery(_prodEntities );
        serversViewSource.Source = serversQuery.ToList();

        //serversViewSource.View.Refresh();
    }

    private IQueryable<Server> GetServersQuery(ProdEntities _prodEntities)
    {
        var serversQuery = _prodEntities.Servers.Where(c => c.Components.Any());
        return serversQuery;
    }

    private void SaveChanges_Click(object sender, RoutedEventArgs e)
    {
        _prodEntities.SaveChanges();
    }       
}

XAML

  <DataGrid AutoGenerateColumns="False" Foreground="DarkBlue"   DataContext="StaticResource serversComponentsViewSource}"
 ItemsSource="{Binding}" Name="componentsDataGrid">

Answer 1

您需要在调用

之前保留DataGrid的SelectedItem

serversViewSource.Source = serversQuery.ToList();

然后将其分配回该DataGrid的SelectedItem。但是，在将该对象分配回SelectedItem之前，您必须在Collection中找到与保留的SelectedItem具有相同值的项目。

private void RebindData()
    {
        CollectionViewSource serversViewSource = (CollectionViewSource)(FindResource("serversViewSource"));
        var selectedItem = (Server)componentsDataGrid.SelectedItem;
        IQueryable<Server> serversQuery = this.GetServersQuery(_prodEntities);
        serversViewSource.Source = serversQuery.ToList();

        foreach (var item in (IEnumerable<Server>)serversViewSource.Source )
        {
            if (selectedItem.PropName == item.PropName)//Compare the values here
            {
                componentsDataGrid.SelectedItem = item;
                break;
            }

        }
        //serversViewSource.View.Refresh();
    }

刷新datagrid项而不会丢失所选行 - XAML

1 个答案: