/// <summary>
 /// 获取砍价的配置  【时间】
 /// </summary>
 /// <param name="startDate"></param>
 /// <param name="endDate"></param>
 /// <returns></returns>
 public async Task <OperationResult <List <BargainProductNewModel> > > SelectBargainProductsByDateAsync(DateTime startDate, DateTime endDate)
 => OperationResult.FromResult(await BargainManager.SelectBargainProductsByDateAsync(startDate, endDate));