查询 数据库的方法

 static void QueryAndWriteTrackingInformationToConsole
(Guid instanceId, TrackingWorkflowEvent 参数)
        {
            SqlTrackingQuery sqlTrackingQuery = new SqlTrackingQuery(connectionString);

            SqlTrackingWorkflowInstance sqlTrackingWorkflowInstance;
            if (sqlTrackingQuery.TryGetWorkflow(instanceId, out sqlTrackingWorkflowInstance))
            {
                foreach (WorkflowTrackingRecord workflowTrackingRecord in sqlTrackingWorkflowInstance.WorkflowEvents)
                {
                    if (workflowTrackingRecord.TrackingWorkflowEvent == 参数)
                    {
      ...........................................
                    }
                }
            }
        }