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以下查询在 EF5 上运行良好,但在 EF6 上出现错误。我使用 DbContext 和 CodeFirst。

EF6 引发的错误:

无法转换类型 'System.Linq.IQueryable 1[[<>f__AnonymousType54[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Int32, mscorlib, Version=4.0.0.0, Culture=中性,PublicKeyToken=b77a5c561934e089],[System.Int32,mscorlib,版本=4.0.0.0,文化=中性,PublicKeyToken=b77a5c561934e089],[System.Int32,mscorlib,版本=4.0.0.0,文化=中性,PublicKeyToken=b77a5c561934e089] ], Wms.Domain, Version=1.0.0.0, Culture=neutral, PublicKeyToken=85d69d39f5becc93]]' 输入'System.Data.Entity.Core.Objects.ObjectQuery1[[<>f__AnonymousType54[[System.Int32,mscorlib,版本=4.0.0.0,文化=中性,PublicKeyToken=b77a5c561934e089],[System.Int32,mscorlib,版本=4.0.0.0,文化=中性,PublicKeyToken=b77a5c561934e089],[System.Int32 ,mscorlib,版本=4.0.0.0,文化=中性,PublicKeyToken=b77a5c561934e089],[System.Int32,mscorlib,版本=4.0.0.0,文化=中性,PublicKeyToken=b77a5c561934e089]],Wms.Domain,版本=1.0.0.0 ,文化=中性,PublicKeyToken=85d69d39f5becc93]]'。LINQ to Entities 仅支持转换 EDM 基元或枚举类型。

查询(简化):

var unitsPerPosition = context.Positions.Include(p => p.Unit).Select(x => new { Unit = x.Unit, Position = x });

var orders = (
                from order in context.Orders.Include(x => x.SourceLocation);
                join unitPosition in unitsPerPosition on order.UnitId equals unitPosition.Unit.UnitId
                group new { order, unitPosition } by new { LocationId = order.SourceLocationId, Level = unitPosition.Position.Level } into groupOrders
                where groupOrders.Key.LocationId != null
                select new { 
                    LocationId = groupOrders.Key.LocationId.Value, 
                    Level = groupOrders.Key.Level, 
                    LoadingOrders = groupOrders.Count(), 
                    UnloadingOrders = -1 }
            );

IList<LocationChannels> searchResult = (from s in context.Locations
        .Include(s => s.Positions)
        .Include(s => s.Positions.Select(sp => sp.Unit))

        let channels = from p in s.Positions
                        where p.LocationId == s.LocationId
                        group p by new { p.LocationId, p.Column, p.Level } into channelsGroup

                        join order in orders on new { channelsGroup.Key.LocationId, channelsGroup.Key.Level } 
                        equals new { order.LocationId, order.Level } into ordersGroup
                        from o in ordersGroup.DefaultIfEmpty()

                        select new Channel
                        {
                            LocationId = channelsGroup.Key.LocationId,
                            Column = channelsGroup.Key.Column,
                            Level = channelsGroup.Key.Level
                        }

        select new LocationChannels
                      {
                        Location = s,
                        Channels = channels,
                      })
    .Where(predicate).ToList();

问题似乎出在左侧加入变量“订单”中加载的匿名类型。我还尝试将 ToList() 添加到“订单”查询中,但随后错误变为:

无法创建“匿名类型”类型的常量值。此上下文仅支持原始类型或枚举类型。

有人可以给我一个关于如何解决它的提示吗?

更新:该错误已在 EF 6.0.2 中得到确认和解决。请参阅 CodePlex 上的问题。

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1 回答 1

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正如 dna2 在他的问题末尾指出的那样,这个问题已在EF 6.0.2. 要升级您的 EF 版本,请在包管理器控制台 (VS2013 VIEW -> Other Windows -> Package Manager Console) 中执行以下操作。

Update-Package EntityFramework -Version 6.0.2 
于 2015-05-21T15:20:31.593 回答