分组来自linq to llblgen

Question

这是我的陈述

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（），就会抛出错误。

  

类型'System.Linq.IQueryable 1[[<>f__AnonymousType0 2 [[Data.Rad.EntityClasses.AxsEntity，Data.Rad，Version = 1.0.4125.30654，Culture = neutral，PublicKeyToken = null]，[Data.Rad .EntityClasses.AccountEntity，Data.Rad，Version = 1.0.4125.30654，Culture = neutral，PublicKeyToken = null]]，Model.Rad，Version = 1.0.0.0，Culture = neutral，PublicKeyToken = null]]'无法转换以任何方式对实体类型。你是否在group by子句中使用了let语句？

无论如何都要这样做。如果我在内存中分组，它会杀死我的电脑。

Answer 1

您不能使用groupby查询来获取实体，因为groupby查询组数据，而实体直接从表中获取。