按顺序分组

Question

这是我的语句

private IEnumerable<IGrouping<AccountEntity,AxsEntity>> GetAxsEntitiesForInvoicing(IDataAccessAdapter adapter)
{
    var metaData = new LinqMetaData(adapter);
    var query = from axsEntity in metaData.Axs
                join accountEntity in metaData.Account on axsEntity.AccountId equals accountEntity.AccountId
                where
                        (axsEntity.DateDeleted.HasValue? axsEntity.DateDeleted.Value<DateTime.Now:true) &&
                        (axsEntity.DateEnd == null || axsEntity.DateEnd > axsEntity.DateRenewal) &&
                        axsEntity.DateRenewal < RenewalDate // NONE INCLUSIVE DATE
                        group axsEntity by accountEntity into axsCol
                select axsCol;
    return query;

一旦我尝试将其转换为。tolist()，它就会抛出错误。

类型'System.Linq.IQueryable 1[[<>f__AnonymousType0 2[[Data.Rad.EntityClasses.]AxsEntity,数据。Rad, Version=1.0.4125.30654, Culture=neutral, PublicKeyToken=null]，[Data.Rad.EntityClasses.]AccountEntity,数据。Rad, Version=1.0.4125.30654, Culture=neutral, PublicKeyToken=null]]， Model。Rad, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]'不能以任何方式转换为实体类型。你是否对group by子句使用了let语句?

有什么方法可以做到这一点吗?如果我在内存中分组，它会杀死我的电脑

Answer 1

不能使用groupby查询来获取实体，因为groupby查询的是组数据，而实体是直接从表中获取的。