获取工作流活动的返回值

//相应流程事件
                    workflowRuntime.WorkflowIdled += OnWorkflowIdled;
                    workflowRuntime.WorkflowStarted += OnWorkflowStarted;
                    workflowRuntime.WorkflowTerminated += OnWorkflowTerminated;
                    workflowRuntime.WorkflowCompleted += OnWorkflowCompleted;
                   //                 workflowRuntime.WorkflowCompleted +=
                   //delegate(object sender, WorkflowCompletedEventArgs e)
                   //{
                   //    outputs = e.OutputParameters;
                   //    waitHandle.Set();
                   //};