Xamarin Multiplatform App Version Synchronization

droid_set_version.targets

<?xml version="1.0" encoding="utf-8"?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <UsingTask TaskName="Increment" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.Core.dll">
    <ParameterGroup>
      <Number ParameterType="System.Int64" Required="true"/>
      <Incremented ParameterType="System.Int64" Output="true"/>
    </ParameterGroup>
    <Task>
      <Code Type="Fragment" Language="cs">
        Incremented = Number + 1;
      </Code>
    </Task>
  </UsingTask>

  <Target Name="BeforeBuild" Condition=" '$(Configuration)' == 'Release' " >
    <PropertyGroup>
      <QueryNamespace>&lt;Namespace Prefix='android' Uri='http://schemas.android.com/apk/res/android' /&gt;</QueryNamespace>
    </PropertyGroup>
    <XmlPeek XmlInputPath="$(AndroidManifest)" Namespaces="$(QueryNamespace)" Query="manifest/@android:versionCode" >
      <Output TaskParameter="Result" ItemName="VersionCode" />
    </XmlPeek>
    <Increment Number="@(VersionCode)">
      <Output ItemName="NewVersionCode" TaskParameter="Incremented"/>
    </Increment>
    <XmlPoke XmlInputPath="$(AndroidManifest)" Namespaces="$(QueryNamespace)" Query="manifest/@android:versionCode" Value="@(NewVersionCode)" />
    <XmlPoke XmlInputPath="$(AndroidManifest)" Namespaces="$(QueryNamespace)" Query="manifest/@android:versionName" Value="$(ReleaseVersion)" />
  </Target> 
</Project>

ios_set_version.targets

<?xml version="1.0" encoding="utf-8"?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

  <UsingTask TaskName="Increment" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.Core.dll">
    <ParameterGroup>
      <Number ParameterType="System.String" Required="true" />
      <Incremented ParameterType="System.String" Output="true" />
    </ParameterGroup>
    <Task>
      <Code Type="Fragment" Language="cs">
        Incremented = $"{Number.Split('.')[0]}.{Number.Split('.')[1]}."+DateTime.Now.DayOfYear.ToString()+DateTime.Now.Hour.ToString();
      </Code>
    </Task>
  </UsingTask>

  <Target Name="BeforeBuild" Condition=" '$(Configuration)' == 'Release' ">
    <PropertyGroup>
      <InfoList>Info.plist</InfoList>
      <VersionQuery>//dict/key[. = 'CFBundleVersion']/following-sibling::string[1]</VersionQuery>
    </PropertyGroup>
    <Increment Number="$(ReleaseVersion)">
      <Output ItemName="NewVersionCode" TaskParameter="Incremented" />
    </Increment>
    <XmlPoke XmlInputPath="$(InfoList)" Query="$(VersionQuery)" Value="@(NewVersionCode)" />
    <XmlPoke XmlInputPath="$(InfoList)" Query="//dict/key[. = 'CFBundleShortVersionString']/following-sibling::string[1]" Value="$(ReleaseVersion)" />
  </Target>   
</Project>