"SuspentionManager.cs" in the model project of universal app

Question

hi there,when the method "RestoreAsync()" be called  in app.cs,the parameter "_registeredFrames" must be empty,why the method does a foreach in "_registeredFrames",when the method called,current status must be Terminated or NotRunning,for no frames have added in it! please help me,thanks very much

        public static async Task RestoreAsync(String sessionBaseKey = null)
        {
            _sessionState = new Dictionary<String, Object>();

            try
            {
                // Get the input stream for the SessionState file
                StorageFile file = await ApplicationData.Current.LocalFolder.GetFileAsync(sessionStateFilename);
                using (IInputStream inStream = await file.OpenSequentialReadAsync())
                {
                    // Deserialize the Session State
                    DataContractSerializer serializer = new DataContractSerializer(typeof(Dictionary<string, object>), _knownTypes);
                    _sessionState = (Dictionary<string, object>)serializer.ReadObject(inStream.AsStreamForRead());
                }

                // Restore any registered frames to their saved state
                foreach (var weakFrameReference in _registeredFrames)
                {
                    Frame frame;
                    if (weakFrameReference.TryGetTarget(out frame) && (string)frame.GetValue(FrameSessionBaseKeyProperty) == sessionBaseKey)
                    {
                        frame.ClearValue(FrameSessionStateProperty);
                        RestoreFrameNavigationState(frame);
                    }
                }
            }
            catch (Exception e)
            {
                throw new SuspensionManagerException(e);
            }
        }

Answer 1

before restoring the _registeredFrame list must be filled. otherwise the SuspensionManager doesnt know which frames should be restored.

SuspensionManager isnt restoring the frames it self, but the state of the registered frames

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Microsoft Certified Solutions Developer - Windows Store Apps Using C#

Answer 2

thanks dave,i got the answer,the true thing is that the previous state saved to local file,and the new frame registered can get the state by the same key