Metro app execution cycle? Is it different for XAML metro app & Javascript metro app?

Question

I have multiple question :)

1.What is metro app execution cycle?

2.Is the cycle different for XAML metro app & Javascript Metro app?

3.What is role of WWAHost.exe in executing metro app (i know its superset of IE).

4. Does the same exe host xaml-metro app also?

Thanks a lot in advance..

Answer 1

Hi Manish,

1. Application lifecycle (Metro style apps) 

2. No

3.  WWAHost.exe is the host process for HTML/JavaScript apps

4. XAML apps do not run in WWAHost.exe

-Jeff

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Jeff Sanders (MSFT)

Answer 2

Thanks a lot for reply.

Based on answers it raised my doubt further :)

a) Everywhere i read, Metro apps can be developed using XAML/C# & Html5/js, then why WWAHost.exe only used for html/js metro apps, not for xaml metro apps ??? What is so diff between two approaches?

b) I was not clear in asking the "Execution Cycle" question (trying now):

i)C#+XAML => Converted to single class => compiled to IL => Code executed by OS +CLR (pls correct me if i am wrong here)

ii)HTML5+Javascript => ? => ? => ...... (I have no idea what happens here)

Curiously waiting for replies :)

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Manishabb2011

Answer 3

Hi

a)It because the WWAHost.exe provides an Internet Explorer-based rendering platform, direct ports are easily accomplished if your app uses HTML, CSS, and JavaScript technologies exclusively. It's not for xmal apps.

b)They have same cycle , Javascript  is first-class citizen in the WinRT ecosystem, they have same winRT API, You can see the architecture below.