Uwp session state

GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Type 'A' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute.

Alternatively, you can ensure that the type is public and has a parameterless constructor - all public members of the type will then be serialized, and no attributes will be required. But now I get. Consider marking the base type 'Prism. I'm having the exactly same problem. I was going to report this, but I saw yours. I analyzed the classes that would have to be modified and it is a little more complicated than simply add the DataContractAttribute.

I copied the code from github and made some nasty changes to make it work. So far so god. Here came the nasty part.

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I do not recommend those changes, but it is what i managed to make work, I think it is better than having an app that can't handle termination. I'll try a fix with [IgnoreDataMember].

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Anyway, it would be great if brianlagunas could tell us, if such a workaround would be accepted as pull request. I'm personally more looking into another approach to fix the session state issue, as it's giving us a lot of headaches with. Hopefully I find the time in the upcoming weeks to test it out. If you got a repro on GitHub, feel free to share it, so I have different test cases to confirm my fix once it's implemented. Seeas both issues will be tackled together once I find the time.

Here it is. Hope it helpsBy using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I am working on UWP application, using Prism 6. I have never seen this exception when I am installing the app packages and running the app. It likely crashed or was terminated for having become unresponsive. This increases the risk of apps being terminated due to system memory pressure. I've built a repro with the Prism sandbox app creating a new type as model, have it serialized on suspension and watch it crash through hitting Suspend and shutdown as application lifecycle event in the Debug location toolbar.

After some research, I managed to solve the crash by adding following lines in the runtime directives Default. Optional attribute. Controls policy for serialization that uses the System. DataContractSerializer class. Source: MSDN. Learn more. Asked 4 years, 4 months ago. Active 4 years, 3 months ago. Viewed 1k times.

Windows 10 universal Windows platform (UWP) app lifecycle

Aakansha Aakansha 2 2 gold badges 6 6 silver badges 20 20 bronze badges. I do navigate in one of scenario like this NavigationService. Navigate "DashBoard", SongClient. I am not able to figure any reason for this error. Since the error message is coming as "Session State", I am assuming its something to do with Suspension manager.

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But that's just assumption right now. It definitely is a problem with that. Try triggering lifecycle events in the debugger, maybe you can observe what happens. Active Oldest Votes. Bart Bart 9, 7 7 gold badges 40 40 silver badges 61 61 bronze badges. Thanks Bart for the update. And sorry about not updating on this thread, I did the very same fix 10 days back.

Well, at least that's a confirmed fix then : Sorry for not finding time earlier to look at it. Bart This problem is still not fixed. I have same problem. Bart If your model derived from Prism.This article is for beginners explaining View State Vs.

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Session State Vs. Application State in simple language and step-by-step. Introduction There are a number of articles and blogs available about ASP. NET state management. I have tried writing this article for beginners explaining these concepts in simple language and step-by-step.

This is a very basic article for beginners that show various state management techniques. It is very confusing for the developers when working with states in ASP. NET web applications. This article will help to understand how practically we should use these. Working with ASP. NET it is very important to understand and use the various states maintenance techniques available. Maintaining states during ASP. NET requests is very important from the application perspective.

uwp session state

Stateless Nature of Web application Web applications run on HTTP protocols and this HTTP protocol is stateless in nature, meaning it does not remember state or retain any state between requests and responses.

Web application Processing Whenever a web application is compiled, the entire source code of the project is compiled into an intermediate language and generates an output assembly that is a DLL residing in the bin folder of the project directory. When the application URL is requested by a user, The web server loads the requested project DLL into memory and creates an instance of the web form requested that results in the creation of a new instance of web form and all the controls and variables available on that requested web form.

Then the web form object is immediately destroyed, meaning that the web form with their control is immediately something after rendering. Sample Code:. We can see a number of ways of doing state management as listed above. But I am going to explain View state, Session State and application state in this article.

View State View State is a technique to maintain the state of controls during page post-back, meaning it stores the page value at the time of post-back sending and receiving information from the server of your page and the view state data can be used when the page is posted back to the server and a new instance of the page is created.

View state data is nothing but a serialized base encoded string stored in a hidden input field on the page and it travels between the browser and the server on every user request and response. Where to Use View state should be used when the user needs to store a small amount of data at the client browser with faster retrieval.This topic describes the lifecycle of a Universal Windows Platform UWP app from the time it is launched until it is closed. Before Windows 8, apps had a simple lifecycle.

Win32 and. NET apps are either running or not running. When a user minimizes them, or switches away from them, they continue to run. This was fine until portable devices and power management became increasingly important. Windows 8 introduced a new application model with UWP apps.

At a high level, a new suspended state was added.


A UWP app is suspended shortly after the user minimizes it or switches to another app. This means that the app's threads are stopped and the app is left in memory unless the operating system needs to reclaim resources. When the user switches back to the app, it can be quickly restored to a running state.

uwp session state

There are various ways for apps that need to continue to run when they are in the background such as background tasksextended executionand activity sponsored execution for example, the BackgroundMediaEnabled capability which allows an app to continue to play media in the background.

Also, background transfer operations can continue even if your app is suspended or even terminated. For more info, see How to download a file. By default, apps that are not in the foreground are suspended which results in power savings and more resources available for the app currently in the foreground.

The suspended state adds new requirements for you as a developer because the operating system may elect to terminate a suspended app in order to free up resources. The terminated app will still appear in the task bar. When the user click on it, the app must restore the state that it was in before it was terminated because the user will not be aware that the system closed the app. They will think that it has been waiting in the background while they were doing other things and will expect it to be in the same state it was in when they left it.

In this topic we will look at how to accomplish that. Windows 10, versionintroduces two more app model states: Running in foreground and Running in background. We will also look at these new states in the sections that follow. This illustration represents the possible app model states starting in Windows 10, version Let's walk through the typical lifecycle of a UWP app. Apps enter the running in background state when they are launched or activated. If the app needs to move into the foreground due to a foreground app launch, the app then gets the LeavingBackground event.

Although "launched" and "activated" may seem like similar terms, they refer to different ways the operating system may start your app.Provides information about the state of the current playback session of a MediaPlayer and provides events for responding to changes in playback session state. For how-to guidance for working with MediaPlayer and playback sessions, see Play audio and video with MediaPlayer.

Gets a value that indicates the current buffering progress of a MediaPlaybackSession. Gets a value that indicates whether media can be paused if the MediaPlayer. Pause method is called. Gets a value that indicates whether the current playback position of the media can be changed by setting the value of the MediaPlayer.

Position property. Gets a value indicating the position after the current playback Position to which downloading has completed and content is buffered. Gets or sets a value indicating whether the content of the media playback session is currently being mirrored horizontally. Gets a value that indicates whether the media that is currently playing in the MediaPlaybackSession is protected by digital rights management DRM. Gets a value indicating the duration of the currently playing media, when being played back at normal speed.

Gets or sets a normalized rectangle within the video source which is rendered by the MediaPlayer. This enables pan and zoom within video. Gets or sets a value representing the current playback rate for the MediaPlaybackSession. Gets or sets a value from the MediaRotation enumeration that specifies the rotation applied to video content during playback. Gets a value indicating the current playback state of the MediaPlaybackSessionsuch as buffering or playing. Gets an object that manages the spherical video projection settings used by the media playback session.

Gets or sets a value specifying the stereoscopic video packing mode for the MediaPlaybackSession. Retrieves a read-only list of time ranges for which data is buffered and playback can begin immediately. Gets an object that expresses the current output degradation policy state of the MediaPlaybackSession. Retrieves a read-only list of time ranges in which the playack position can be seeked to.App data is mutable data that is created and managed by a specific app.

It includes runtime state, app settings, user preferences, reference content such as the dictionary definitions in a dictionary appand other settings. App data is different from user datadata that the user creates and manages when using an app.

User data includes document or media files, email or communication transcripts, or database records holding content created by the user.

User data may be useful or meaningful to more than one app.

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Often, this is data that the user wants to manipulate or transmit as an entity independent of the app itself, such as a document. Important note about app data: The lifetime of the app data is tied to the lifetime of the app. If the app is removed, all of the app data will be lost as a consequence. Don't use app data to store user data or anything that users might perceive as valuable and irreplaceable.

We recommend that the user's libraries and Microsoft OneDrive be used to store this sort of information. App data is ideal for storing app-specific user preferences, settings, and favorites. Use settings to store user preferences and application state info. The app data API enables you to easily create and retrieve settings we'll show you some examples later in this article.

When an app is installed, the system gives it its own per-user data stores for settings and files. You don't need to know where or how this data exists, because the system is responsible for managing the physical storage, ensuring that the data is kept isolated from other apps and other users.

The system also preserves the contents of these data stores when the user installs an update to your app and removes the contents of these data stores completely and cleanly when your app is uninstalled.

Within its app data store, each app has system-defined root directories: one for local files, one for roaming files, and one for temporary files. Your app can add new files and new containers to each of these root directories.

Local app data should be used for any information that needs to be preserved between app sessions and is not suitable for roaming app data. Data that is not applicable on other devices should be stored here as well. There is no general size restriction on local data stored. Use the local app data store for data that it does not make sense to roam and for large data sets. Before you can read or write local app data, you must retrieve the local app data store.

To retrieve the local app data store, use the ApplicationData. LocalSettings property to get the app's local settings as an ApplicationDataContainer object. Use the ApplicationData. LocalFolder property to get the files in a StorageFolder object. LocalCacheFolder property to get the folder in the local app data store where you can save files that are not included in backup and restore.Welcome to the University of Wisconsin-Parkside!


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uwp session state

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