Question

So I am screwed Again. I had a WP7.1 Project and I added some of the Code for the Pinch And Zoom Facility
After adding the code as said, I Started Getting this Error

AppManifest Validation failed. Invalid AppPlatformVersion in WMAppmanifest.xml

Now I checked My WPAppManifest.xml(Window Interface) and found that none of the screen resolutions is checked by default. When I tried To check(wvga) , I was shown the error

Designer Couldnt be loaded ,Open In XML view to fix

my WPManifest looks like this(first few lines)

<?xml version="1.0" encoding="utf-8"?>
<Deployment xmlns="http://schemas.microsoft.com/windowsphone/2009/deployment" AppPlatformVersion="7.1">
  <App xmlns="" ProductID="{60d84a47-d758-4f91-8111-0bd47bb9a6c0}" Title="Effects" RuntimeType="Silverlight" Version="1.0.0.0" Genre="apps.normal" Author="AviaryDemo author" Description="Sample description" Publisher="AviaryDemo">
    <IconPath IsRelative="true" IsResource="false">ApplicationIcon.png</IconPath>
    <Capabilities>
      <Capability Name="ID_CAP_MEDIALIB" />
      <Capability Name="ID_CAP_NETWORKING" />
      <Capability Name="ID_CAP_ISV_CAMERA" />
    </Capabilities>
    <Tasks>
      <DefaultTask Name="_default" NavigationPage="MainPage.xaml"/>
    </Tasks>

2) I want to add this
I am confused , how to add the point no (7) in my App.xaml which looks like this

<Application 
    x:Class="AviaryDemo.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"       
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:h="clr-namespace:AviaryDemo"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone">

    <!--Application Resources-->
    <Application.Resources>

        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="/AviarySDK;component/Themes/generic.xaml"/>
            </ResourceDictionary.MergedDictionaries>
            <resources:Images xmlns:resources="clr-namespace:AviarySDK.Resources;assembly=AviarySDK"  x:Key="ImageResources"/>
            <aviary:LocalizedStrings xmlns:aviary="clr-namespace:AviarySDK;assembly=AviarySDK" x:Key="LocalizedStrings" />
        </ResourceDictionary>

    </Application.Resources>

    <Application.ApplicationLifetimeObjects>
        <!--Required object that handles lifetime events for the application-->
        <shell:PhoneApplicationService 
            Launching="Application_Launching" Closing="Application_Closing" 
            Activated="Application_Activated" Deactivated="Application_Deactivated"/>
    </Application.ApplicationLifetimeObjects>

</Application>

Help is needed ! Thanks Alot

Answer 1

Upgrading a project to Windows Phone 8 means that some changes are done internally and not just in the app manifest. The sole fact that you mentioned that some errors appeared in the manifest after adding a class to the project means that probably you did something to the manifest itself.

First things first, the ActivationPolicy attribute is not supported in Windows Phone 7.1.

If you decide to upgrade a WP 7.1 project to Windows Phone 8, you need to use the built-in upgrade option: