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I have a WP 7.1 app in the marketplace, but some features crash in WP 8.
I don't use VS 2010 anymore and would like to take the opportunity to create a WP8 version of the app.
Imagine that I have a user that runs my 7.1 app on his Windows Phone 8 and that he has already saved data to isolated storage. Will he see the WP 8 version of my app as an upate? Will he lose data already stored in Isolated Storage?
No, the user will not lose data in the isolated storage as long as it's an update to the existing app. Make sure you don't replace the old xap, add a new one for WP8 instead.
This is my app that have got both WP7.1 and WP8 xaps. You should see something similar in your dashboard once you uploaded your WP8 version.
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I have a Windows Phone 8.1 Silverlight App. I do not need an Universal App. I just need my app to run on Windows Phone Devices. So, should I continue my app on the Silverlight platform or should I develop it on WinRT? Will having it developed on Silverlight be a problem in the near future? What are the pros and cons? Also, which has got more support on forums, which is more powerful and which is the one MS supports more?
Develop it as a Universal App, but have it target Mobile only. UWP (Universal Windows Platform) has more support now. RT & Silverlight are essentially obsolete.
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I have developed a Windows Phone 8.0 App.
How do I deploy or publish it to the Windows Phone Store?
Are there any step by step instructions on how to do it?
I would like to publish my .xap file in the Windows Phone Store or Windows Store so that users can download it for free.
All this information can be found on the Windows Phone Dev Center.
Here is information on creating your App Info: http://msdn.microsoft.com/en-us/library/windowsphone/help/jj206733(v=vs.105).aspx
And here are details on uploading your XAP package: http://msdn.microsoft.com/en-us/library/windowsphone/help/jj206723(v=vs.105).aspx
Just take a look here at the Dev Center of Microsoft for the Windows Phone. There you will need to create an acoount to publish your Apps. You will find a link called Submit App or Publish at the top. Just follow the steps mentioned there.
For this, you have to create a developer account.
link to create account. There you can publish your app. After submitting your app, Microsoft will review it. If pass the review it will available for public, else you have to make changes as they say and have to resubmit it.
You need to fulfill these requirements before you submit your app to app store.
App submission requirements for Windows Phone
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If not then what all modifications would be needed for the same. I have an app written for Windows Phone 8 and have to port it for Windows Surface RT. What all are the key points to look for and if possible any documentations pointing to the same.
No, you can not directly port. If you have used MVVM pattern then you can reuse you MODEL and VIEMODEL. You have to modify VIEW only. For more information on MVVM you can look at the MSDN Documentation
No Windows Phone apps cannot run directly on any other device other than windows phone.
That said, MOST of the code can be reused.
Look into Portable class libraries (PCL).
These libraries allow you to write code that is reusable across multiple platforms.
PCL's -
MSDN Document on Portable Class Libraries
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i would like to know if there is a way to make an app in wp8 that uninstall itself after some specific time.
for example i make an app that makes filters on photos, i test this app on my phone, after testing i forget to uninstall it and so i would like to have a timer inside that app so that it can uninstalls itself after some time.
or is there a way to make an app that checks for some apps(that i have developed) on my phone and uninstalls them in some regular time(that is the app wakes app, cheks if that app exist on my phone and if that apps exist on my phone it uninstalls it)?
i thank you in advance for the help
Installing and uninstalling of app requires more permissions than any app sandbox environment provides to it.
You can check the time when the app was installed to user machine and thus forbid the user for using it post-specific time. Similar to what trial version softwares work like.
Second part of your question clearly violates the user rights. As the requirement is to uninstall other apps using another app. I doubt that this can not be done.
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So I have a windows phone bought from service provider A, that I want to use to develop an app for service provider B. now the problem (I believe) is that service provider A has preloaded info on the windows phone under the extras+info -> additional info (like hardcoded a value). So what happens is although I put a SIM from service provider B into the phone it still gets detected that the device belongs to service provider A.
Now my question is, can I somehow overwrite that info on the phone using my app, or is it even possible to change that info, could it maybe be another setting or something on the phone that I am not aware of.
I strongly believe this is not possible without OEM capabilities.