VB.NET自定义函数

很简单，在end select前再多加一种情况case else return "XXXx",因为你只提供了0-9这10种情况

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Public Function Zuhe(ByVal qa As String) As String

Select Case qa

Case "0"

Return "1"

Case "1"

Return "3"

Case "2"

Return "4"

Case "3"

Return "6"

Case "4"

Return "2"

Case "5"

Return "8"

Case "6"

Return "9"

Case "7"

Return "7"

Case "8"

Return "5"

Case "9"

Return "0"

Case else

Return "XXXX"

End Select

End Function

vb.net 编写一个函数

注意：参数为动态数组；

Private Function MyF(ByRef d() As Integer)

ReDim d(4, 13) As Integer

Dim i As Integer

Dim j As Integer

Dim n As Integer

Dim MyNum(4) As Integer

For i = 1 To 4

MyNum(i) = 0

Next i

Randomize

For i = 1 To 4

For j = 1 To 13

n = Int(Rnd * 4 + 1)

Do While MyNum(n) = 13

n = Int(Rnd * 4 + 1)

Loop

d(i, j) = n

MyNum(n) = MyNum(n) + 1

Next j

Next i

End Function

VB.net 如何编写一个可以返回数组的函数（过程）？

public function createstringarr() as string()

return new string(){"d1","d2","d3","d4"}

end function

使用vb.net编写一个函数，函数只有一个参数

首先在窗体上添加Button1，ListBox1，下面是完整代码

Public Class Form1

Public Sub BubbleSort(ByVal arr() As Integer) '冒泡法排序

Dim temp As Double

Dim i, j As Integer

For i = 0 To arr.GetUpperBound(0) - 1

For j = i + 1 To arr.GetUpperBound(0) - 1

If arr(i)  arr(j) Then

temp = arr(j)

arr(j) = arr(i)

arr(i) = temp

End If

Next

Next

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click '调用

Dim arr() As Integer = {55, 22, 33, 11, 77, 88}

BubbleSort(arr) '调用排序过程

Me.ListBox1.Items.Clear()

For i = 0 To arr.GetUpperBound(0) - 1 '显示排序后结果

Me.ListBox1.Items.Add(arr(i).ToString)

Next

End Sub

End Class

vb。net中的最大值及最小值函数的编写

'vb.net2008

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim min, max As Integer

Dim a() As Integer = {3, 2, 4, 1}

min = Proc(a)(0)

max = Proc(a)(1)

End Sub

Private Function Proc(ByVal a() As Integer)

Dim a_out(a.GetUpperBound(0)), a_m(1) As Integer

System.Array.Copy(a, a_out, a.GetUpperBound(0) + 1)

System.Array.Sort(a_out)

a_m(0) = a_out(0)

a_m(1) = a_out(a_out.GetUpperBound(0))

Return a_m

End Function

End Class

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