C# Linq到SQL中的关联显示为EntitySet<>；，为什么？

我在设计类似于这个遗留存储过程的Linq时遇到了很多麻烦。最大的障碍是它似乎不想让我在与

tblAddress

的连接中添加第二个“子句”。我收到一个

无法解决方法…

错误。该

tblBusiness.tblAddress

被视为一个

EntitySet

查看当前工作的底部

有人能指出我做错了什么吗？下面是我需要转换的

SPROC

，第二是我迄今为止的

LINQ

尝试；它充满了失败

谢谢

SELECT dbo.tblPersonInsuranceCoverage.PersonInsuranceCoverageID, 
    dbo.tblPersonInsuranceCoverage.EffectiveDate, 
    dbo.tblPersonInsuranceCoverage.ExpirationDate, 
    dbo.tblPersonInsuranceCoverage.Priority, 
    dbo.tblAdminInsuranceCompanyType.TypeName AS CoverageCategory, 
    dbo.tblBusiness.BusinessName, 
    dbo.tblAdminInsuranceType.TypeName AS TypeName,
    CASE WHEN dbo.tblAddress.AddressLine1 IS NULL THEN '' ELSE dbo.tblAddress.AddressLine1 END 
    + ' ' + 
    CASE WHEN dbo.tblAddress.CityName IS NULL THEN '' ELSE '<BR>' + dbo.tblAddress.CityName END 
    + ' ' + 
    CASE WHEN dbo.tblAddress.StateID IS NULL THEN '' 
         WHEN dbo.tblAddress.StateID = 'ns' THEN '' 
         ELSE dbo.tblAddress.StateID END AS Address
FROM      
    dbo.tblPersonInsuranceCoverage 
        LEFT OUTER JOIN dbo.tblInsuranceCompany 
            ON dbo.tblPersonInsuranceCoverage.InsuranceCompanyID = dbo.tblInsuranceCompany.InsuranceCompanyID 
                LEFT OUTER JOIN dbo.tblBusiness     
                    ON dbo.tblBusiness.BusinessID = dbo.tblInsuranceCompany.BusinessID 
                        LEFT OUTER JOIN dbo.tblAddress 
                            ON dbo.tblAddress.BusinessID = dbo.tblBusiness.BusinessID and tblAddress.AddressTypeID = 'b' 

        LEFT OUTER JOIN dbo.tblAdminInsuranceCompanyType 
            ON dbo.tblPersonInsuranceCoverage.InsuranceCompanyTypeID = dbo.tblAdminInsuranceCompanyType.InsuranceCompanyTypeID  

        LEFT OUTER JOIN dbo.tblAdminInsuranceType 
            ON dbo.tblPersonInsuranceCoverage.InsuranceTypeID = dbo.tblAdminInsuranceType.InsuranceTypeID   

WHERE tblPersonInsuranceCoverage.PersonID = @PersonID

编辑以供进一步尝试 因此，我在dbml中添加了一些关联，以便我可以接受下面Craigs的建议。它几乎起作用了。现在我在

a.AddressTypeID

上得到了一个

无法解析符号的
。奇怪的是，Intellisense告诉我，
tblAddress
是一个
EntitySet
。我是否错过了一个关联，或者我有一个不合适的关联，或者我只是太深了

想法？
我不知道它是否能满足您的所有需要，但您可以使用匿名类型与复合键进行Equijoin：

 from x in table1
 join y in table2 on new { x.Id1, x.Id2 } equals new { y.Id1, y.Id2 }
 ...

看看这是否有帮助。
。相反，请使用L2S为您生成的导航/关联属性：

var coverage = 
                from insuranceCoverage in context.tblPersonInsuranceCoverages
                where insuranceCoverage.PersonID == personID
                select new
                    {
                            insuranceCoverage.PersonInsuranceCoverageID,
                            insuranceCoverage.EffectiveDate,
                            insuranceCoverage.ExpirationDate,
                            insuranceCoverage.Priority,
                            CoverageCategory = insuranceCoverage.insuranceCompany.tblAdminInsuranceCompanyType.TypeName,
                            insuranceCoverage.insuranceCompany.tblBusiness.BusinessName,
                            TypeName = insuranceCoverage.InsuranceTypeID,
                            Address = insuranceCoverage.insuranceCompany.Addresses
                                                                        .Where(a => a.AddressTypeID == 'b')
                                                                        .FirstOrDefault()
                        };

我同意，不幸的是，我没有被赋予智能感知的选项……我想知道为什么……好吧，我进入了
dbml
并添加了一些
关联。我不知道为什么它们不是自动生成的，但我离题了。在那之后，除了
地址
部分，我可以按照你的建议去做。有关详细信息，请参见我的编辑。谢谢当您键入
a.
时，IntelliSense向您显示了什么？你可能需要做一些类似于
a.AddressType.Id
（注意额外的点）的事情。不过，我是个白痴。它应该读为a.AddressTypeID='b'
注意大写的D和第二个=wow！！无论如何，谢谢你的帮助。
var coverage = 
                from insuranceCoverage in context.tblPersonInsuranceCoverages
                where insuranceCoverage.PersonID == personID
                select new
                    {
                            insuranceCoverage.PersonInsuranceCoverageID,
                            insuranceCoverage.EffectiveDate,
                            insuranceCoverage.ExpirationDate,
                            insuranceCoverage.Priority,
                            CoverageCategory = insuranceCoverage.insuranceCompany.tblAdminInsuranceCompanyType.TypeName,
                            insuranceCoverage.insuranceCompany.tblBusiness.BusinessName,
                            TypeName = insuranceCoverage.InsuranceTypeID,
                            Address = insuranceCoverage.insuranceCompany.Addresses
                                                                        .Where(a => a.AddressTypeID == 'b')
                                                                        .FirstOrDefault()
                        };