我的目标很简单,我正在尝试为数据库中的产品生成所有可能组合的列表.
所以例如;产品选项如下
>产品选项：颜色/值：红色,绿色,蓝色
>产品选项：尺寸/值：小,中,大,XL
>产品选项：风格/价值观：男士,女士
Small,Red,Mens Small,Green,Blue,Mens etc
无论我是否将2,3,4或5个数组传入其中,我都需要该函数.
我已经做了很多研究并且发现了以下文章但却无法实现我的目标.
我找到的文章如下：
> How to Generate Combinations of Elements of a List<T> in .NET 4.0
> vb .net permutation of string. permutation or combination?
在笛卡儿产品上调整
Eric Lippert’s blog的代码：
原文链接：https://www.f2er.com/vb/255563.htmlPrivate 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)