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How to find all Workflows in an assembly

Posted by Igor Moochnick on 01/28/2008

This is a beginning of series of articles on workflows discoverablity and automation.

It’s easy to start a workflow if you know it’s type:

   1: WorkflowRuntime runtime = new WorkflowRuntime();
   2: runtime.StartRuntime();
   3: 
   4: WorkflowInstance workflow = runtime.CreateWorkflow(typeof(MyWorkflowType), parms);

But what if you have an assembly and you don’t know a workflow type? Reflection is the answer. This is how you can find all the types in an assembly that inherit from an Activity (base type for all workflows) type:

   1: public static IEnumerable<Type> FindWorkflows(Assembly asm)
   2: {
   3:     return from t in asm.GetTypes()
   4:            where t.IsSubclassOf(typeof(Activity))
   5:            select t;
   6: }
   7: 
   8: [TestMethod]
   9: public void FindAllWorkflowsInAssembly()
  10: {
  11:     foreach (Type t in WFHelper.FindWorkflows(WFHelper.LoadWorkflowAssembly(assembly_path)))
  12:     {
  13:         System.Diagnostics.Trace.WriteLine(t.Name);
  14:     }
  15: }

Note: the list, returned by FindWorfklows function, will contain all Custom activities in the provided assembly as well.

If you want to know how to narrow down the list, stay tuned.

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