ProjectHack

ZipOutput.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <UsingTask TaskName="ZipDir" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v12.0.dll">
    <ParameterGroup>
      <ZipFileName ParameterType="System.String" Required="true" />
      <DirectoryName ParameterType="System.String" Required="true" />
    </ParameterGroup>
    <Task>
      <Reference Include="System.IO.Compression.FileSystem" />
      <Using Namespace="System.IO.Compression" />
      <Code Type="Fragment" Language="cs">
        <![CDATA[
      try
      {
        Log.LogMessage(string.Format("Zipping Directory {0} to {1}", DirectoryName, ZipFileName));
        ZipFile.CreateFromDirectory( DirectoryName, ZipFileName );
        return true;
      }
      catch(Exception ex)
      {
        Log.LogErrorFromException(ex);
        return false;
      }
    ]]>
      </Code>
    </Task>
  </UsingTask>

  <Target Name="ZipOutput" AfterTargets="Build">
    <ZipDir
      ZipFileName="$(OutDir)../MyZipFileName.zip"
      DirectoryName="$(OutDir)"
    />
    <Message Text="Zipped: $(OutDir)" Importance="high"/>
  </Target>

</Project>