VB.net中具有匿名类型和选项严格的Linq分组

尝试做一些我确信应该很简单的事情，但是要与linq和VB打交道。我有下面的例子，我用属性对集合进行分组，然后想要访问我的组的属性。我的问题是匿名打字。由于option strict，我必须给出一个显式类型，但我无法确定该类型应该是什么。由于t.HeadAccountKey不是值（因为t具有对象类型），因此无法编译下面的代码。所以要么我需要做一些铸造，要么我的linq选择器出错

public class TempObject
    public HeadKey as string
    Public SubKey as string
    Public SomeValue as decimal
end class

public class GroupTest
public sub RunTest
    dim collection new List(of TempObject) = GetTestCollection()

    Dim groupedValues As IEnumerable = From n In collection _
        Group By key = n.HeadKey Into Group Select HeadKeyValue = key, SubValues = Group

    for each t as object in groupedValues
    debug.print(t.HeadKeyValue)
        next

End sub

private function GetTestCollection() as List(of TempObject)
    dim result as new list(of tempobject)
    Dim x As New tempObject
    x.HeadAccountNumber = "A"
        x.SubAccountNumber = "B"
        x.Value = 500
        result.Add(x)
        x = New tempObject
        x.HeadAccountNumber = "A"
        x.SubAccountNumber = "C"
        x.Value = 600
        result.Add(x)
        x = New tempObject
        x.HeadAccountNumber = "B"
        x.SubAccountNumber = "D"
        x.Value = 100
    result.add(x)
    return result
end function
End class

---

您不需要指定类型，至少使用（推荐，不要与

选项Strict

混淆）

因此，以下工作：

Dim collection = GetTestCollection()
Dim groupedValues = From n In collection
    Group n By n.HeadKey Into Group

For Each t In groupedValues
    Dim hk = t.HeadKey
    Dim group = t.Group
Next