Linq VB.net to PowerShell 5.1 - vb.net

Question

I have a Linq query in VB.Net which works fine.
I now need to transform this to work in PowerShell by using the static Linq methods.
I figured out how to do simple select and where queries but especially the grouping and "new with" I am not sure how to translate...
The goal is to find out if the entries (dataRows) in a Data Table that do have the same AttributeKey also have the same AttributeValue AndAlso the same AttributeType or not.
Dim dt As New DataTable
dt.Columns.Add("AttributeKey")
dt.Columns.Add("AttributeValue")
dt.Columns.Add("AttributeType")
dt.Rows.Add("Action", "MakeItSo", "System.String")
dt.Rows.Add("Action", "MakeItSo", "System.String")
dt.Rows.Add("Action", "True", "System.Boolean")
dt.Rows.Add("Single", "MyVal", "System.String")
Dim srcGroupBy = dt.AsEnumerable.GroupBy(Function(Attrib) New With
{
Key .AttributeKey = Attrib.Field(Of String)("AttributeKey")
}).
Where(Function(grp) grp.Count() > 1).
Select(Function(grp) New With {
Key .AttributeKey = grp.Key.AttributeKey,
Key .CounterVal = grp.GroupBy(Function(AttributeVal) AttributeVal.Item("AttributeValue").ToString().ToUpper()).Count(),
Key .CounterType = grp.GroupBy(Function(AttributeType) AttributeType.Item("AttributeType").ToString().ToUpper()).Count(),
Key .ExistsInInconsistentStates = grp.GroupBy(Function(x) x.Item("AttributeValue").ToString().ToUpper()).Count() > 1 Or
grp.GroupBy(Function(x) x.Item("AttributeType").ToString().ToUpper()).Count() > 1
})
I could also solve this without Linq in PS like this:
[PSObject]$res=$DV |
Group-Object -Property "AttributeKey" |
Where-Object -FilterScript {$PsItem.Count -gt 1} |
Select-Object -Property #("Name","Count",#{Name='CountDistinctVals';Expression=`
{
$PsItem.Group.AttributeValue |
Select-Object -Unique |
Measure-Object |
Select-Object -ExpandProperty "Count"
}`
},#{Name='CountVals';Expression=`
{
$PsItem.Group.AttributeValue |
Select-Object |
Measure-Object |
Select-Object -ExpandProperty "Count"
}`
},#{Name='CountDistinctTypes';Expression=`
{
$PsItem.Group.AttributeType |
Select-Object -Unique |
Measure-Object |
Select-Object -ExpandProperty "Count"
}`
},#{Name='CountTypes';Expression=`
{
$PsItem.Group.AttributeType |
Select-Object |
Measure-Object |
Select-Object -ExpandProperty "Count"
}`
})
I can then evaluate the first row and check if distinct count = all count which would also meet my requirement for that particular use case.
Anyway, it would be still interesting for me to know whether it could be done also in Linq with PS. (Not saying that this would always be the preferred way)
Thanks
Chris