c# - Sub Workflow in Windows Workflow Foundation and Persistence -


i have custom activity should call sub workflow according name passed in inargument.

public class callsubworkflowactivtiy : nativeactivity {

public inargument<string> selectedworkflow { get; set; }  protected override void execute(nativeactivitycontext context) {    activity subworkflow = activityfactory.createactivity(selectedworkflow.get(context));    context.scheduleactivity(activity);  }  protected override void cachemetadata(nativeactivitymetadata metadata) {  }

}

my prefered solution invoke child activity context.scheduleactivity. doesn't work because can't add metadata.addimplementationchild(subworkflow) in cachemeta(context) because haven't access inarguments @ point.

a solution hack around access inarguments in cachemetadata. isn't solution should implemented.

another solution came use workflowinstance or workflowinvoker execute subworkflow activities.

public class callsubworkflowactivtiy : nativeactivity { public inargument selectedworkflow { get; set; }

protected override void execute(nativeactivitycontext context) {    activity subworkflow = activityfactory.createactivity(selectedworkflow.get(context));    workflowapplication wfinstance = new workflowapplication(subworkflow);   }

}

this solution practically work. not sure how persistance handled in subworkflow how parent workflow continues when child workflow finishes.

my questions now:

  1. is there way call subworkflow activities context.scheduleactivity(...) if activity wasn't added practically metadata.addimplementationchild(subworkflow)
  2. if use workflowinstance class how persistance handled , how continue parent workflow if child workflow finishes.

i solved problem follows:

 protected override void cachemetadatainternal(system.activities.nativeactivitymetadata metadata)         {             inargument<string> workflowversionargument = selectedworkflow;             if (workflowversionargument != null && workflowversionargument.expression != null)             {                 string selectedworkflowstring = workflowversionargument.expression.tostring();                 if (selectedworkflowstring != null)                 {                     workflowversion wfversion = workflowversion.loadfromxml(selectedworkflowstring);                     if (wfversion != null && wfversion.workflowname != null)                     {                         versionedactivity subworkflow = activityfactory.instance.createactivity(wfversion.workflowname, wfversion.version);                         if (subworkflow != null && subworkflow.activityprop != null)                         {                             subworkflowinternal = subworkflow.activityprop;                             metadata.addimplementationchild(subworkflowinternal);                         }                     }                 }             }         }

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