C# 多个表上的实体框架左联接将创建内部联接

我试图创建一个将四个表连接在一起的查询，其中只有一个表保证存在。我以前在EF中成功创建过左连接，但从未使用过多个连接。以下是查询：

   var details = (from planInfo in context.PlanInfo
                 join templateRec in context.ProductTemplates
                    on planInfo.TemplateId equals templateRec.TemplateId into templateGroup
                 from template in templateGroup.DefaultIfEmpty()
                 join profileRec in context.CustomerProfiles
                    on planInfo.ProfileId equals profileRec.ProfileId into profileGroup
                 from profile in profileGroup.DefaultIfEmpty()
                 join territoryRec in context.Territories
                    on planInfo.TerritoryId equals territoryRec.TerritoryId into territoryGroup
                 from territory in territoryGroup.DefaultIfEmpty()
                 where planInfo.ActiveStatus
                 && planInfo.PlanId == plan.PlanId
                 select new
                 {
                    PlanId = planInfo.PlanId,
                    TemplateId = planInfo.TemplateId,
                    TemplateGridId = planInfo.TemplateId,
                    ProfileRec = (profile == null ?
                    new
                    {
                       ProfileId = 0,
                       ProfileGridId = 0,
                       Description = string.Empty
                    } :
                    new
                    {
                       ProfileId = profile.ProfileId,
                       ProfileGridId = profile.ProfileId,
                       Description = profile.Description
                    }),
                    ProfileId = (profile == null ? 0 : profile.ProfileId),
                    TerritoryRec = (territory == null ?
                    new
                    {
                       TerritoryId = 0,
                       TerritoryGridId = 0,
                       Description = string.Empty
                    } :
                    new
                    {
                       TerritoryId = territory.TerritoryId,
                       TerritoryGridId = territory.TerritoryId,
                       Description = territory.Description
                    }),
                    TerritoryId = (territory == null ? 0 : territory.TerritoryId),
                    Description = (template == null ? string.Empty: template.Description),
                    TemplateEffectiveDate = planInfo.TemplateEffectiveDate,
                    TemplateExpiryDate = planInfo.TemplateExpiryDate,
                    MinVolume = planInfo.MinVolume,
                    MaxVolume = planInfo.MaxVolume,
                    AccrualPercent = planInfo.AccrualPercent,
                    AccrualPercentNatl = planInfo.AccrualPercentNatl,
                    EffectiveDate = planInfo.EffectiveDate,
                    ExpiryDate = planInfo.ExpiryDate
                 }).ToList();

下面是它生成的SQL。无论我做什么，我总是得到几个

内部连接

，然后是

左连接

，而我想要的是所有

左连接

SELECT 
    [Filter1].[PlanId] AS [PlanId], 
    [Filter1].[TemplateId1] AS [TemplateId], 
    [Filter1].[ProfileId1] AS [ProfileId], 
    [Filter1].[Description1] AS [Description], 
    CASE WHEN ([Extent4].[TerritoryId] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C1], 
    [Extent4].[TerritoryId] AS [TerritoryId], 
    [Extent4].[Description] AS [Description1], 
    CASE WHEN ([Extent4].[TerritoryId] IS NULL) THEN 0 ELSE [Extent4].[TerritoryId] END AS [C2], 
    [Filter1].[Description2] AS [Description2], 
    [Filter1].[TemplateEffectiveDate] AS [TemplateEffectiveDate], 
    [Filter1].[TemplateExpiryDate] AS [TemplateExpiryDate], 
    [Filter1].[MinVolume] AS [MinVolume], 
    [Filter1].[MaxVolume] AS [MaxVolume], 
    [Filter1].[AccrualPercent] AS [AccrualPercent], 
    [Filter1].[AccrualPercentNatl] AS [AccrualPercentNatl], 
    [Filter1].[EffectiveDate] AS [EffectiveDate], 
    [Filter1].[ExpiryDate] AS [ExpiryDate]
    FROM   (SELECT [Extent1].[PlanId] AS [PlanId], [Extent1].[TemplateId] AS [TemplateId1], [Extent1].[TerritoryId] AS [TerritoryId], [Extent1].[TemplateEffectiveDate] AS [TemplateEffectiveDate], [Extent1].[TemplateExpiryDate] AS [TemplateExpiryDate], [Extent1].[MinVolume] AS [MinVolume], [Extent1].[MaxVolume] AS [MaxVolume], [Extent1].[AccrualPercent] AS [AccrualPercent], [Extent1].[AccrualPercentNatl] AS [AccrualPercentNatl], [Extent1].[EffectiveDate] AS [EffectiveDate], [Extent1].[ExpiryDate] AS [ExpiryDate], [Extent2].[Description] AS [Description2], [Extent3].[ProfileId] AS [ProfileId1], [Extent3].[Description] AS [Description1]
        FROM   [dbo].[PlanInfo] AS [Extent1]
        INNER JOIN [dbo].[ProductTemplates] AS [Extent2] ON [Extent1].[TemplateId] = [Extent2].[TemplateId]
        INNER JOIN [dbo].[CustomerProfiles] AS [Extent3] ON [Extent1].[ProfileId] = [Extent3].[ProfileId]
        WHERE [Extent1].[ActiveStatus] = 1 ) AS [Filter1]
    LEFT OUTER JOIN [dbo].[Territories] AS [Extent4] ON [Filter1].[TerritoryId] = [Extent4].[TerritoryId]
    WHERE [Filter1].[PlanId] = '12345'

---

希望有人能指出我做错了什么。谢谢

内部联接表示所需的n:1关联。如果您有导航属性，则联接将是对另一个必需实体的引用，而不是对集合的引用。EF从数据模型中知道，

外部连接

在这里没有效果，因此它生成一个

内部连接

您可能没有这些表？首先是一个内在的问题：为什么您使用

join

而不是使用导航属性？什么是

plan.PlanId

？@GertArnold我没有使用导航属性，因为目前没有任何定义，我希望能够在不改变数据模型中任何内容的情况下实现这一点。@HamletHakobyan

plan.PlanId

是代码中上面的头记录。这是在一个循环中发生的，我们正在提取所选计划的详细信息。但是我可以更改哪些表得到左连接，哪些表得到内部连接。如果我将连接从第一个移动到最后一个，那么ProductTemplates会突然得到一个左连接，Territions（以前是左连接）现在会得到一个内部连接。我需要了解更多关于关联的信息来解释这一点。但现在对我来说已经有点晚了……我不确定关联是否是最初问题的原因，但通过向实体添加导航属性，我能够让它工作并简化查询。谢谢你的建议！