为什么此Linq查询从同一SQL视图返回3个相同的行?

我有一个简单的视图定义了MSSQL2008。视图定义如下:

    SELECT     dbo.tblCompany.CompanyID, dbo.tblAccount.Carrier, SUM(ISNULL(dbo.tblLine.LineCharge, 0)) + SUM(ISNULL(dbo.tblLine.FeatureCharge, 0)) 
                      + SUM(ISNULL(dbo.tblLine.AccessCharge, 0)) AS SumOfCharges
FROM         dbo.tblCompany LEFT OUTER JOIN
                      dbo.tblCompany_Location LEFT OUTER JOIN
                      dbo.tblAccount LEFT OUTER JOIN
                      dbo.tblLine LEFT OUTER JOIN
                      dbo.tblBill_Data ON dbo.tblLine.LineID = dbo.tblBill_Data.LineID ON dbo.tblAccount.AccountID = dbo.tblLine.AccountID ON 
                      dbo.tblCompany_Location.LocationID = dbo.tblAccount.LocationID ON dbo.tblCompany.CompanyID = dbo.tblCompany_Location.CompanyID
GROUP BY dbo.tblCompany.CompanyID, dbo.tblAccount.Carrier

它以以下形式返回数据:

1    Carrier1          $70.00
1    Carrier2         $100.00
1    Carrier3         $150.00
3    Carrier2          $60.00
....etc

这对SQL Select语句很好。

我有一个vb linq查询,它只是基于companyID设置一个where子句。

Dim expenses = From exp In Me.vw_CarrierExpenses _
                       Where exp.CompanyID = companyId _
                       Select exp

        Return expenses.ToList()

如果我根据1的companyID进行筛选,使用上面的示例数据,我会得到第一行3次:

1    Carrier1          $70.00
1    Carrier1          $70.00
1    Carrier1          $70.00

我一定错过了一些很简单的东西。它总是返回正确数量的行,但数据总是相同的。谢谢。