MSBuild Find MSBuildProjectDirectory Parent Directory

trunk/MainSolution.sln
trunk/Build/MyBuild.Proj
trunk/Library/...
trunk/etc...

<RootFolder>$(MSBuildProjectDirectory)..</RootFolder>

C:ProjectsMyProjectTrunkBuild..CodeAnalysismyfile.xml

<Target Name="GetMSBuildProjectParentDirectory">
  <!-- First you create the MSBuildProject Parent directory Item -->
  <CreateItem Include="$(MSBuildProjectDirectory)..">
    <Output ItemName="MSBuildProjectParentDirectory" TaskParameter="Include"/>
  </CreateItem>

  <!-- You can now retrieve its fullpath using Fullpath metadata -->
  <Message Text="%(MSBuildParentDirectory.Fullpath)"/>

  <!-- Create a property based on parent fullpath-->
  <CreateProperty Value="%(MSBuildParentDirectory.Fullpath)">
    <Output PropertyName="CodeFolder" TaskParameter="Value"/>
  </CreateProperty>
</Target>