Sometimes you just want to be able to create a workflow in code bus save it as a XOML workflow so the end user has the opportunity to modify it.

Well it turns out to be quite easy as the WorkflowMarkupSerializer class is your friend. The following code does just that. And most of the code is to create the workflow in the first place as the serialization part is just 3 lines!

using (XmlWriter writer = XmlWriter.Create("MyWorkflow.xoml"))
{
    WorkflowMarkupSerializer serializer = new WorkflowMarkupSerializer();
    SequentialWorkflowActivity myWorkflow = new SequentialWorkflowActivity();

    ListenActivity listen = new ListenActivity();
    myWorkflow.Activities.Add(listen);
    EventDrivenActivity leftBranch = new EventDrivenActivity();
    leftBranch.Activities.Add(new DelayActivity("LeftDelay")
    {
        TimeoutDuration = TimeSpan.FromSeconds(5)
    });
    listen.Activities.Add(leftBranch);

    EventDrivenActivity rightBranch = new EventDrivenActivity();
    rightBranch.Activities.Add(new DelayActivity("RightDelay")
    {
        TimeoutDuration = TimeSpan.FromSeconds(5)
    });
    listen.Activities.Add(rightBranch);

    serializer.Serialize(writer, myWorkflow);
}

This produces the following XOML workflow:

<?xml version="1.0" encoding="utf-8"?>
<SequentialWorkflowActivity x:Name="SequentialWorkflowActivity"
                            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/workflow">
  <ListenActivity x:Name="listenActivity1">
    <EventDrivenActivity x:Name="eventDrivenActivity1">
      <DelayActivity TimeoutDuration="00:00:05" x:Name="LeftDelay" />
    </EventDrivenActivity>
    <EventDrivenActivity x:Name="eventDrivenActivity2">
      <DelayActivity TimeoutDuration="00:00:05" x:Name="RightDelay" />
    </EventDrivenActivity>
  </ListenActivity>
</SequentialWorkflowActivity>