Question

我正在制作一个程序，使用按钮点击在ListBox中随机生成数字为100行15。我需要将它从LARGEST排序到SMALLEST，从左到右排成行。我有一个冒泡排序，但它排序最小到最大，只排在第一列。

这就是我获取数字的方式：

 Private Sub btnGen_Click(sender As Object, e As EventArgs) Handles btnGen.Click
    'Number Generator
    Dim rn As New Random()
    Dim array(14) As Integer      
    Dim temp As Integer
    Dim st As String

    For y As Integer = 1 To 100
        For x As Integer = 1 To 15
            array(x - 1) = rn.Next(100, 1000)
        Next
        txtList.Items.Add(ats(array))
    Next
    st = st & vbNewLine

    Call sort()

    Using fs As New FileStream(My.Settings.DAT_PATH, FileMode.Append, FileAccess.Write)
        Using sw As New StreamWriter(fs)
            sw.WriteLine()
        End Using
    End Using

End Sub

Function ats(ar As Integer()) As String
    'FUNCTION for array to string seperated by comma
    Dim sb As New System.Text.StringBuilder
    For x As Integer = 0 To UBound(ar)
        If x = UBound(ar) Then
            sb.Append(ar(x).ToString)
        Else
            sb.Append(ar(x).ToString & ", ")
        End If
    Next
    Return sb.ToString
End Function

这就是我对它们进行排序的方式：

 Sub sort()

    'bubble sort from biggest to smallest 
    txtList.Sorted = True
    Dim array(14) As Integer
    Dim temp As Integer
    For ipass = 1 To UBound(array)
        For i = 0 To UBound(array) - 1
            If array(i) > array(i + 1) Then
                temp = array(i)
                array(i) = array(i + 1)
                array(i + 1) = temp
                array.Reverse()
            End If
        Next i
    Next ipass
End Sub

最后，这是我当前结果的一个例子：

107,512,139,233,582,460,698,231,395,724,717,284,699,419,825

119,214,513,382,538,161,431,603,573,354,757,307,204,906,200

124,493,153,507,675,878,698,911,625,171,915,174,270,629,770

126,585,480,317,731,193,385,143,152,374,246,124,205,347,936

139,497,422,381,127,968,236,637,406,758,594,944,929,733,428

任何帮助将不胜感激

Answer 1

我遵循了你做事的“方式”。你应该知道有更好的方法来达到你想要的目的。

Private Sub btnGen_Click(sender As Object, e As EventArgs) Handles btnGen.Click
    'Number Generator
    Dim rn As New Random()
    Dim array(14) As Integer
    Dim temp As Integer
    Dim st As String

    For y As Integer = 1 To 100
        For x As Integer = 1 To 15
            array(x - 1) = rn.Next(100, 1000)
        Next
        'txtList.Items.Add(ats(array))
    Next

    Dim sortedArray = sort(array)



    Using fs As New FileStream(My.Settings.DAT_PATH, FileMode.Append, FileAccess.Write)
        Using sw As New StreamWriter(fs)
            For Each item In sortedArray
                sw.WriteLine(item)
            Next
        End Using
    End Using
End Sub

Function sort(array() As Integer) As IEnumerable(Of Integer)

    'bubble sort from biggest to smallest 
    txtList.Sorted = True

    Dim temp As Integer
    For ipass = 1 To UBound(array)
        For i = 0 To UBound(array) - 1
            If array(i) > array(i + 1) Then
                temp = array(i)
                array(i) = array(i + 1)
                array(i + 1) = temp

            End If
        Next i
    Next ipass
    Dim sortedArray = array.Reverse()
    Return sortedArray
End Function

Answer 2

这是使用专用课程的替代解决方案。

Input()方法接受一个布尔开关，允许按升序或降序对List(Of Integer)进行排序。
Output()方法将返回String()数组，该数组可使用其ListBox方法传递给.AddRange()。
Delimiter属性可用于指定字符串组件（在本例中为整数值）必须如何分隔。

Private Class SortedLists
    Private OutputList As List(Of String)

    Public Sub New()
        OutputList = New List(Of String)
        Delimiter = ", "
    End Sub

    Public Property Delimiter As String

    Public Sub Input(Values As List(Of Integer), Ascending As Boolean)
        If Ascending Then
            Values.Sort()
        Else
            Dim IValues As IOrderedEnumerable(Of Integer) = Values.OrderByDescending(Function(i) i)
            Values = IValues.ToList()
        End If

        OutputList.Add(String.Join("", Values.
                              Select(Function(val, i) (val.ToString &
                              If(i < Values.Count - 1, Delimiter, "")))))
    End Sub

    Public Function Output() As String()
        Return OutputList.ToArray()
    End Function
End Class

重构过程创建随机整数列表，将字符串结果添加到ListBox控件，将字符串保存到文件中。
使用StopWatch计算的整个过程的经过时间为7~9毫秒使用File.WriteAllLines()经过的时间是10~14毫秒。

Dim rn As New Random()
Dim MySortedLists As New SortedLists
Dim MyIntegerList As New List(Of Integer)

For y As Integer = 1 To 100
    For x As Integer = 1 To 15
        MyIntegerList.Add(rn.Next(100, 1000))
    Next
    MySortedLists.Input(MyIntegerList, False)
    MyIntegerList.Clear()
Next

txtList.Items.AddRange(MySortedLists.Output())

'File.WriteAllLines is a little slower, but it's easier to read
File.WriteAllLines(My.Settings.DAT_PATH, MySortedLists.Output)


'Using fs As New FileStream(My.Settings.DAT_PATH, FileMode.Append, FileAccess.Write)
'    Using sw As New StreamWriter(fs)
'        For Each line As String In MySortedLists.Output
'            sw.WriteLine(line)
'        Next
'    End Using
'End Using

在VS2012中使用visual basic按降序对数组进行排序

2 个答案: