FrameSessionStateKeyProperty

Question

Hello everyone!

I am trying to register the root Frame in App.xaml.cs file like this :

HelloWorld.Common.SuspensionManager.RegisterFrame(rootFrame, "appFrame");
if (rootFrame == null)
            {
                // Create a Frame to act as the navigation context and navigate to the first page
                rootFrame = new Frame();
                HelloWorld.Common.SuspensionManager.RegisterFrame(rootFrame, "appFrame");
            ...
but when i debug the SuapensioManager.cs file throw an exception in this line of code :
 public static void RegisterFrame(Frame frame, String sessionStateKey)
        {
            if (frame.GetValue(FrameSessionStateKeyProperty) != null)
            {
                throw new InvalidOperationException("Frames can only be registered to one session state key");
            }

 What i am doing wrong here ? 

Thanks in advance!

Answer 1

what exception you get? this one? "Frames can only be registered to one session "

then you are registering the frame multiple times

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Microsoft Certified Solutions Developer - Windows Store Apps Using C#

Answer 2

Yes, this one , but i register it only once just like the code above

Answer 3

From the error you report it must be registered twice. Put a break point on RegisterFrame and you should be able to see where the unexpected registration comes from in the debugger

Answer 4

I found the error finally! It was registered twice as you said... Thank you for your help!!