SharePoint:在StartWorkflow()终止后访问工作流变量

我正在通过调用WorkflowManager.StartWorkflow()从SharePoint事件接收器以编程方式运行SharePoint工作流。

工作流正在执行期间设置一些工作流变量。是否有方法在工作流终止后访问这些变量的最后一个值(例如,对startWorkflow()的调用返回)?

下面是我的示例代码,演示了我的意图:

    public override void ItemAdded(SPItemEventProperties properties)
    {
        SPWorkflow workflow = null;
        SPWorkflowManager workflowManager = null;
        try
        {
            base.ItemAdded(properties);

            workflowManager = properties.OpenWeb().Site.WorkflowManager;
            var workflowAssociation = properties.ListItem.ParentList.WorkflowAssociations[0];

            workflow = workflowManager.StartWorkflow(properties.ListItem, workflowAssociation, "<Data></Data>");

            // I can read any fields that were updated by the WF
            SPListItem item = properties.ListItem.ParentList.GetItemById(properties.ListItemId);
            string validationResult = (string) item["ValidationResult"];

            // how can I access any workflow variables created during execution?
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex);
            if (workflow != null && workflowManager != null)
            {
                SPWorkflowManager.CancelWorkflow(workflow);
            }
            throw;
        }
   }