Workflow (WF) RuleEngine without Workflow

Rule engine is a very useful feature and not always we want the entire Workflow to get into play.

Here is a simple code snippet showing how one can use RuleCondition/RuleSet outside the Workflow scope:

WorkflowMarkupSerializer serializer = new WorkflowMarkupSerializer();
using (Stream s = typeof(Program).Assembly.GetManifestResourceStream("SimplePolicyWorkflow.rules"))
{
    RuleDefinitions rd = (RuleDefinitions)serializer.Deserialize(XmlReader.Create(s));
    RuleCondition c = rd.Conditions[0]; // or RuleSet

    //typeof(rule context) should be passed
    RuleValidation v = new RuleValidation(typeof(Program), null);

    if (c.Validate(v))
    {
        //rule context instance should be passed
        RuleExecution exe = new RuleExecution(v, new Program());
        c.Evaluate(exe);
    }
}