Herald.Common.SuspensionManager.SaveAsync C# (CSharp) Метод

        public static async Task SaveAsync()
        {
            try
            {
                // 保存所有已注册框架的导航状态
                foreach (var weakFrameReference in _registeredFrames)
                {
                    Frame frame;
                    if (weakFrameReference.TryGetTarget(out frame))
                    {
                        SaveFrameNavigationState(frame);
                    }
                }

                // 以同步方式序列化会话状态以避免对共享
                // 状态
                MemoryStream sessionData = new MemoryStream();
                DataContractSerializer serializer = new DataContractSerializer(typeof(Dictionary<string, object>), _knownTypes);
                serializer.WriteObject(sessionData, _sessionState);

                // 获取 SessionState 文件的输出流并以异步方式写入状态
                StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync(sessionStateFilename, CreationCollisionOption.ReplaceExisting);
                using (Stream fileStream = await file.OpenStreamForWriteAsync())
                {
                    sessionData.Seek(0, SeekOrigin.Begin);
                    await sessionData.CopyToAsync(fileStream);
                }
            }
            catch (Exception e)
            {
                throw new SuspensionManagerException(e);
            }
        }