powashell.csproj

<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <!-- This inline task executes c# code. -->
  <!-- C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe powaShell.csproj -->
  <Target Name="Hello">
   <ClassExample />
  </Target>
    <UsingTask
    TaskName="ClassExample"
    TaskFactory="CodeTaskFactory"
    AssemblyFile="C:\Windows\Microsoft.Net\Framework\v4.0.30319\Microsoft.Build.Tasks.v4.0.dll" >
    <Task>
     <Reference Include="C:\Windows\assembly\GAC_MSIL\System.Management.Automation\1.0.0.0__31bf3856ad364e35\System.Management.Automation.dll" />
     <!-- Your PowerShell Path May vary -->
      <Code Type="Class" Language="cs">
        <![CDATA[
            using System;
            using System.Reflection;
            using Microsoft.Build.Framework;
            using Microsoft.Build.Utilities;
             
            using System.Collections.ObjectModel;
            using System.Management.Automation;
            using System.Management.Automation.Runspaces;
            using System.Text;
                 
            public class ClassExample :  Task, ITask
            {
                public override bool Execute()
                {
                    Console.WriteLine("Hello From a Class.");
                    Console.WriteLine(powaShell.RunPSCommand());
                    return true;
                }
            }
             
            //Based on Jared Atkinson's And Justin Warner's Work
            public class powaShell
            {
                public static string RunPSCommand()
                {
                                         
                    //Init stuff
                     
                    InitialSessionState iss = InitialSessionState.CreateDefault();
                    iss.LanguageMode = PSLanguageMode.FullLanguage;
                    Runspace runspace = RunspaceFactory.CreateRunspace(iss);
                    runspace.Open();
                    RunspaceInvoke scriptInvoker = new RunspaceInvoke(runspace);
                    Pipeline pipeline = runspace.CreatePipeline();
                     
                    //Interrogate LockDownPolicy
                    Console.WriteLine(System.Management.Automation.Security.SystemPolicy.GetSystemLockdownPolicy());                
                     
                     
                     
                    //Add commands
                    pipeline.Commands.AddScript("[Math]::Sqrt(9)");
 
                    //Prep PS for string output and invoke
                    pipeline.Commands.Add("Out-String");
                    Collection<PSObject> results = pipeline.Invoke();
                    runspace.Close();
 
                    //Convert records to strings
                    StringBuilder stringBuilder = new StringBuilder();
                    foreach (PSObject obj in results)
                    {
                        stringBuilder.Append(obj);
                    }
                    return stringBuilder.ToString().Trim();       
                }
            }
                             
        ]]>
      </Code>
    </Task>
  </UsingTask>
</Project>