select报错

       query = query.Where(c => c.MfcKey==temp);
                    int hhho = query.Count();
                    query = from q in query
                            join par in pf.GetList() on q.ArtID equals par.ArtID
                            orderby par.ATime descending
                            select par;

关于这个SELECT

因为select筛选前对QUEry赋值并给定义了实体类，所以在select后我不能给她定义匿名类，定义的类型应与筛选的实体类相同，

如果要定义匿名类的话，正确写法如下：

       query = query.Where(c => c.MfcKey==temp);
                    int hhho = query.Count();
                  var  ry = from q in query
                            join par in pf.GetList() on q.ArtID equals par.ArtID
                            orderby par.ATime descending
                            select new{
q.ArtID

};

　　推荐一篇好文https://www.cnblogs.com/liujie2272/p/6732461.html