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Wednesday, 11 July 2012

Process Lifetime Management (PLM) and Managing State in Windows 8 Metro C# Applications

In the traditional Windows environment, the user manages the lifetime of their applications. The user launches the application and it continues to run until the user decides to close it. The problem with this model is that applications continue to drain system resources, including memory and CPU, even when they are not in the foreground. This impacts the performance of the application the user is using as well as drains the battery faster when the device is not plugged in.

Windows 8 Metro applications only run when they are in the foreground. This allows the user to focus on the primary application they wish to interact with. Applications in the background go into a suspended state. In the suspended state the threads for the application are literally frozen in place. The application will no longer take up system resources or impact battery life. Most of the time, the application will remain in memory. This allows fast application switching, so when the user swipes back to a different application, it resumes immediately as if it were already running.

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