如何为主细节datagridview设置自动刷新绑定到实体框架？ [英] How to set auto-refresh for master detail datagridview bound to entity framework?

问题描述

我正在开发一个WPF Master详细信息应用程序。我想每隔5秒自动刷新一次页面。我使用Dispatcher来实现这一目标。一切正常，但所选项目仅在5秒钟内突出显示，5秒后，默认选定行显示在顶部，替换我的选定项目。



I尝试设置issynchronizedwithcurrentitem =False，但是如果设置为false，则selecteditem（对于Master-detail场景）不起作用。



这是我试过的，

I am developing a WPF Master detail application. I would like to auto refresh my page every 5 secs. I have used a Dispatcher to achieve this. everything works fine, but the selected item is highlighted only for those 5 seconds, after 5 secs the default selected row is being displayed on the top replacing my selecteditem.

I have tried setting the issynchronizedwithcurrentitem="False", but with this set to false, the selecteditem ( for Master-detail scenario) doesn''t work.

this is what I have tried,

public partial class MainWindow : Window
{
    WpfApplication1.PersonsEntities personsEntities;
    System.Windows.Data.CollectionViewSource personViewSource;
    System.Data.Objects.ObjectQuery<WpfApplication1.person> personQuery;

    public MainWindow()
    {
        InitializeComponent();
    }

    private ObjectQuery<person> GetpersonQuery(PersonsEntities personsEntities)
    {
        var personQuery = personsEntities.person;
        return personQuery as ObjectQuery<person>;
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        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)
    {
        personsEntities = new WpfApplication1.PersonsEntities();
        personViewSource = ((System.Windows.Data.CollectionViewSource)  (this.FindResource("personViewSource")));
        personQuery = this.GetpersonQuery(personsEntities);
        personViewSource.Source = personQuery.Execute(System.Data.Objects.MergeOption.AppendOnly);
    }
}

推荐答案

我认为它可以这样工作：获取 personViewSource.View.CurrentItem 在分配新的 Source 之前。之后使用 personViewSource.View.MoveCurrentTo 再次选择它。再说一遍：我认为这应该有用，但我没有时间设置一个例子并试一试 - 抱歉。

I think it can work like this: Get your personViewSource.View.CurrentItem before assigning the new Source. After that use personViewSource.View.MoveCurrentTo to select it again. Again: I "think" this should work, but I had no time to set up an example and try it - sorry.

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