UWP issues

APPX4001.md

APPX4001: Build property AppxBundlePlatforms is not explicitly set and is calculated based on currently building architecture. Use 'Create App Package' wizard or edit project file to set it

=> Add AppxBundlePlatforms section to .csproj

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    ...
    <AppxBundlePlatforms>x86|x64|arm</AppxBundlePlatforms>
  </PropertyGroup>

Default.rd.xml

<!-- Let’s open the file Default.rd.xml inside the project Properties folder: it contains the Runtime Directives for .NET Native -->

<Directives xmlns="http://schemas.microsoft.com/netfx/2013/01/metadata">
    <Application>
        <!--
          An Assembly element with Name="*Application*" applies to all 
          assemblies in the application package. The asterisks are not 
          wildcards.
        -->
         
        <Assembly Name="*Application*" Dynamic="Required All" />
 
        <!-- Add your application specific runtime directives here. -->
        <Type Name="Windows.UI.Xaml.Controls.ItemClickEventArgs"
              Dynamic="Required Public" />
 
    </Application>
</Directives>