改编来自 Eric Lippert 的博客关于笛卡尔积:

Adapting code from Eric Lippert's blog on Cartesian products:

Private Function CartesianProduct(Of T)(ParamArray sequences As T()()) As T()()

    ' base case: 
    Dim result As IEnumerable(Of T()) = {New T() {}}
    For Each sequence As var In sequences
        Dim s = sequence
        ' don't close over the loop variable 
        ' recursive case: use SelectMany to build the new product out of the old one 
        result = From seq In result
                 From item In s
                 Select seq.Concat({item}).ToArray()
    Next
    Return result.ToArray()
End Function

用法:

Dim s1 As String() = New String() {"small", "med", "large", "XL"}
Dim s2 As String() = New String() {"red", "green", "blue"}
Dim s3 As String() = New String() {"Men", "Women"}

Dim ss As String()() = CartesianProduct(s1, s2, s3)