Tuesday, May 27, 2008

Adding code to a XOML workflow

I was aware that it was possible to add code to a XOML workflow but I hadn't actually seen any examples of it, until I started looking into the Metastorm WF integration. I'm not sure it's something I'd like to do, it's pretty ugly and I like the idea of producing a workflow definition in a purely declarative manner. That way you're forced to put real code in their own activities which I think helps the overall design of your system. However there is one place where it isn't possible to do everything in XML, when you need to add a property to a XOML workflow. So here's an example of that. If you get stuck using this, you're on your own, I don't know much about it and the documentation seems a bit thin on the ground. Here's hoping that MS add support for XOML properties in the next release...

<x:Code><![CDATA[//<?xml version="1.0" encoding="utf-16"?>
//<XCodeItem xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xsi:type="XCodeProperty">
//  <MemberTypeName>System.Boolean</MemberTypeName>
//  <MemberName>Thingy</MemberName>
//  <EmitDependencyProperty>true</EmitDependencyProperty>
//  <IsMetaProperty>false</IsMetaProperty>
//  <IsAttached>false</IsAttached>
//  <IsReadOnly>false</IsReadOnly>

public static System.Workflow.ComponentModel.DependencyProperty ThingyProperty = DependencyProperty.Register("Thingy", typeof(System.Boolean), typeof(MyWorkflow));

public bool Thingy
return ((bool)(base.GetValue(MyWorkflow.ThingyProperty)));
base.SetValue(MyWorkflow.ThingyProperty, value);

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