从App.xaml.cs访问不同页面的MediaElement控件

Question

I have a MediaElement control in Media.xaml which I would like to access from App.xaml.cs like this:

private void OnSuspending(object sender, SuspendingEventArgs e)
{
    var deferral = e.SuspendingOperation.GetDeferral();
    //Media.MediaElement.Pause();
    deferral.Complete();
}

Can anyone tell me how to do that?

Answer 1

First, I added x:FieldModifier="Public" to the MediaElement :

<MediaElement Name="meMedia" x:FieldModifier="Public"/>

Then, added this code to App.xaml.cs :

if (rootFrame.Content.GetType.Name == "Media") {rootFrame.Content.mc.Pause();}

Answer 2

You could create a public property:

Media.xaml:

<MediaElement x:Name="mediaElement" ... />

Media.xaml.cs:

public MediaElement
{
    get { return mediaElement; }
}

---

I don't know the details of your program structure, but there should be a way of getting the currently active Media instance. If you really don't have such a reference (and if there is also only one Media instance), a workaround might be to create a static instance accessor property:

Media.xaml.cs:

public static Media Instance { get; private set; }

// constructor
public Media()
{
    ...
    Instance = this;
}

Now you may write this in App.xaml.cs:

Media.Instance.MediaElement.Pause();      

Answer 3

You can use the following code to access the current Media page and pause its MediaElement:

var frame = (Frame)Window.Current.Content;
var page = frame.Content as Media;
if (page != null && page.MediaElement.CanPause) page.MediaElement.Pause();

However, if your intent is to pause the playing media when the user switches to another app, you should use the Window.Current.CoreWindow.VisibilityChanged event.