C# - 依赖注入 - 存储库层 - 调用 select

Question

我意识到需要依赖注入，因为我需要一个新的 class 但无法将其创建为实体，因为数据库中不存在 class。我成功地完成了统一部分。我只是坚持调用它。以下代码是我尝试过的，但它不允许我使用 select 选项。我得到的错误是

The type arguments for method cannot be inferred from the usage. Try specifying the type arguments explicitly

我用谷歌搜索了那个错误，但大多数发布该错误的人背后都有很长的代码历史，这让我很难理解。

谁能看出我哪里错了？？

   public virtual List<IMcrVolumeAdjustmentMainGrid> GetVolumeAdjustmentByLoadId(Guid? LoadId)
    {
        var AdjustmentGroups = UnitOfWork.Context.Set<McrVolumeAdjustment>()
                .Include(y => y.McrVolumeAdjustmentReason)
                .Where(x => x.McrPickup.McrLoadId == LoadId && x.McrVolumeAdjustmentReason.McrVolumeAdjReasonCode != McrVolumeAdjReasonCodeEnum.LoadRejected)
                .GroupBy(x => new { x.McrVolumeAdjustmentReason, x.EffectiveYear, x.EffectiveMonth, x.LastModifierIdentityName })
                .ToList();
        return AdjustmentGroups.Select(
               x =>
               {
                   var entry = DefaultContainer.Current.Resolve<IMcrVolumeAdjustmentMainGrid>();
                   entry.EffectiveDate = new DateTime(x.Key.EffectiveYear, x.Key.EffectiveMonth, 01);
                   entry.McrReason = x.Key.McrVolumeAdjustmentReason.Description;
                   entry.LastModifierIdentityName = x.Key.LastModifierIdentityName;
                   entry.TotalAdjustment = x.Sum(y => y.AdjustedMilkVolume);
               }
            ).ToList();
    }

Answer 1

看来你的SELECT声明是无效的，因为你return什么都没有。您应该将 "return entry;" 代码添加到 select lambda 的末尾。

C# - 依赖注入 - 存储库层 - 调用 select

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