/// <summary>
 /// 发送提醒信息方法
 /// </summary>
 /// <param name="args">The <see cref="Workflows.WorkflowEventArgs"/> instance containing the event data.</param>
 /// <param name="remind">提醒类型</param>
 /// <param name="assignedUsers">下一步动作的执行者</param>
 /// <returns>发送成功消息的Id集合</returns>
 public abstract int[] SendMsg(WorkflowEventArgs args, MsgRemind remind, string[] assignedUsers);