时间段搜索
//下单时间
if (searchModel.CreateTime != null)
{
var createTime = searchModel.CreateTime.Value.Date;
condition = condition.And(x => x.CreateTime >= createTime);
}
if (searchModel.EndTime!=null)
{
var endTime = searchModel.EndTime.Value.AddDays(1).Date;
condition = condition.And(x => x.CreateTime < endTime);
}