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Workflow GetNextActivityInstance

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The following code sample shows how to read the next ActivityInstance in a workflow. Mind you that for this to work, the current Activity has to be finished. Only then a next Activity Instance is created, and can thus be retrieved:

/// <summary>
/// Get the next ActivityInstance, if there is one. If the current Activity has not finished, there is no next activity.
/// </summary>
/// <returns></returns>
protected ActivityInstance GetNextActivityInstance() {
    ActivityInstance activityInstance = CurrentWorkItem.Activity as ActivityInstance;
    ProcessInstance processInstance = activityInstance.Process as ProcessInstance;
    IList<ActivityInstance> activities = new List<ActivityInstance>(processInstance.Activities);

    if (activityInstance.Position < activities.Count) { //Position is 1-based
        return activities[activityInstance.Position];
    } else {
        return null;
    }
}

In a similar fashion, you can retrieve the next manual Activity:

/// <summary>
/// Get the next manual ActivityInstance, if there is one.
/// </summary>
/// <param name="activityInstance">current ActivityInstance</param>
/// <returns></returns>
protected ActivityInstance GetNextManualActivityInstance() {
    ActivityInstance nextActivity = GetNextActivityInstance();
    if (nextActivity != null) {
        TridionActivityDefinition activityDefinition = nextActivity.ActivityDefinition as TridionActivityDefinition;
        if (String.IsNullOrEmpty(activityDefinition.Script)) {
            return nextActivity;
        } else {
            Logger.Warn("AbstractHandler.GetNextManualActivityInstance: Next activity is not a manual activity! This is not supported...");
        }
    }

    return null;
}

Note how the check is done to determine a manual Activity: String.IsNullOrEmpty(activityDefinition.Script). There is currently no other way to determine the type of an Activity (manual vs automatic).

For the code-above we need to know the CurrentWorkItem, which is the WorkItem of the current item in the workflow.

The code above is part of YAWF (Yet Another Workflow Framework).

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