刚开始这样   

var StaffLists = StaffList.OrderBy(_ => _.TeamName).OrderBy(_=>_.UserName).ToList()// 排序完全是按照后面UserName排序的跟前面的TeamName字段没关系；

 

改为

var StaffLists = StaffList.OrderBy(_ => _.TeamName).ThenBy(_=>_.UserName).ToList();