/// <summary>
/// 年级下移
/// </summary>
/// <param name="gradeid"></param>
/// <returns></returns>
public static async Task GradeDown(Guid gradeid)
{
using (var gradeSvc = new GradeService())
{
var grade = await gradeSvc.GetOne(gradeid);
var beforeGrade = await gradeSvc.GetAll
(m => m.Order > grade.Order).FirstOrDefaultAsync();
if (beforeGrade == null)
{
return;
}
await gradeSvc.ChangeOrder(gradeid, beforeGrade.Order, false);
await gradeSvc.ChangeOrder(beforeGrade.Id, grade.Order);
}
}