Arrays 在vb.net中获取数组的所有可能组合

我在VB.net中有几个数组。这些数组有不同的长度，我需要它们之间的组合。简单的解决方案是使用嵌套循环，如示例所示：

Dim Array1= {10, 11, 12}
Dim Array2= {15}
Dim Array3= {1,2,3}
Dim array(2) As Object
array(0) = Array1
array(1) = Array2
array(2) = Array3

for (a = 1 to < Array1.Length - 1) 
    for (b = 1 to < Array2.Length - 1) 
        for (c = 1 to < Array3.Length - 1)            
             'Get combination
          Next
      Next
 Next

Output: {10,15,1},{10,15,2},{10,15,3},{11,15,1},{11,15,2},...

Dim Array1={10,11,12}
Dim Array2={15}
Dim Array3={1,2,3}
作为对象的Dim阵列（2）
数组（0）=数组1
数组（1）=数组2
数组（2）=数组3
对于（a=1至

但真正的问题是数组的数量不是一个固定的参数（可以是示例中的3或任何其他数字），因此嵌套循环不是解决方案

---

有什么想法吗？

您可以创建一个列表来保存所有数组中的组合值，然后将这些值推回数组，如下所示：

Dim listCombined = New List(Of Integer)
listCombined.AddRange(array1)
listCombined.AddRange(array2)
listCombined.AddRange(array3)

Dim arrayCombined As Integer() = listCombined.ToArray()

---

注意：本例假设您有整数数组，但您可以将类型更改为数组实际包含的任何类型。你也可以在数组中循环，而不是在

AddRange

调用中逐个列出它们。

这里是我十年前写的一些代码的快速重写，当时我还在使用VB.Net 2003…我的硬盘里有多么美好的回忆啊

希望您发现它的输出有用：

10,15,1
10,15,2
10,15,3
11,15,1
11,15,2
11,15,3
12,15,1
12,15,2
12,15,3

生成它的代码：

Public Class Form1

    Private WithEvents FC As ArrayCombinations = Nothing

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        If IsNothing(FC) Then
            FC = New ArrayCombinations
            FC.AddArray(New Integer() {10, 11, 12})
            FC.AddArray(New Integer() {15})
            FC.AddArray(New Integer() {1, 2, 3})
            FC.GenerateCombos()
        End If
    End Sub

    Private Sub FC_combinations(combos As System.Collections.Generic.List(Of System.Collections.Generic.List(Of Integer))) Handles FC.Combinations
        For Each combo As List(Of Integer) In combos
            Debug.Print(String.Join(",", combo.Select(Function(i) i.ToString())))
        Next
        FC = Nothing
    End Sub

End Class

Public Class ArrayCombinations

    Private Arrays As New List(Of Integer())
    Private WithEvents BGW As New System.ComponentModel.BackgroundWorker
    Public Event Combinations(ByVal combos As List(Of List(Of Integer)))

    Public Sub New()
        BGW.WorkerReportsProgress = True
    End Sub

    Public Sub AddArray(ByVal values() As Integer)
        If Not BGW.IsBusy Then
            Arrays.Add(values)
        End If
    End Sub

    Public Sub GenerateCombos()
        If Not BGW.IsBusy Then
            BGW.RunWorkerAsync()
        End If
    End Sub

    Private Sub BGW_DoWork(sender As Object, e As System.ComponentModel.DoWorkEventArgs) Handles BGW.DoWork
        Dim sizes As New List(Of Integer)
        Dim combinations As Integer
        Dim remainder As Integer
        Dim quotient As Integer
        Dim combination As List(Of Integer)
        Dim combos As New List(Of List(Of Integer))

        If Arrays.Count > 0 Then
            combinations = 1
            For Each factor() As Integer In Arrays
                sizes.Add(factor.Count)
                combinations = combinations * factor.Count
            Next

            For i As Integer = 0 To combinations - 1
                combination = New List(Of Integer)
                For j As Integer = 1 To Arrays.Count
                    combination.Add(Nothing)
                Next

                quotient = i \ sizes.Item(sizes.Count - 1) ' Integer Division
                remainder = i Mod sizes.Item(sizes.Count - 1)

                combination(Arrays.Count - 1) = Arrays.Item(Arrays.Count - 1)(remainder)
                For j As Integer = (sizes.Count - 2) To 0 Step -1
                    combination.Item(j) = Arrays.Item(j)(quotient Mod sizes.Item(j))
                    quotient = quotient \ sizes.Item(j) ' Integer Division
                Next
                combos.Add(combination)
            Next

            e.Result = combos
        End If
    End Sub

    Private Sub BGW_RunWorkerCompleted(sender As Object, e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles BGW.RunWorkerCompleted
        RaiseEvent Combinations(e.Result)
    End Sub

End Class

---

你是说输入是数组的数组吗？比如交错的2D数组，或者数组的集合？不完全清楚这里要问什么。