WorkflowInvoker in WF 4.0

Just noticed this new and handy class in .NET 4.0 Beta 2. Following is its description on MSDN document:

"Windows Workflow Foundation (WF) provides several methods of hosting workflows. WorkflowInvoker provides a simple way for invoking a workflow as if it were a method call and can be used only for workflows that do not use persistence."

Simple enough, if we just want to invoke a workflow synchronously with current thread (WorkflowInvoker also provides asynchronous versions of the invoke method with InvokeAsync and BeginInvoke), WorkflowInvoker is your best friend, and you don't need to set up the environment for workflow runtime:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Activities;
using System.Activities.Statements;

class Program
{
    static void Main(string[] args)
    {
        Activity activity = new WriteLine() { Text = "Workflow running at " + DateTime.Now.ToString() };
        WorkflowInvoker.Invoke(activity);
        Console.ReadLine();
    }
}

For long running workflows or persistence scenarios, .NET 4.0 also added a new WorkflowApplication class, which provides a richer model for executing workflows that includes notification of lifecycle events, execution control, bookmark resumption, and persistence. Details refer to http://msdn.microsoft.com/en-us/library/system.activities.workflowapplication.aspx.