VB.NET如何把字符串（不全是数字或为空）转换成数字？

明白你的意思了,只要是字母都会转换成数字,帮你写好了("usernane"和 "pasward" 我这里写成 "username" 和" password"）

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

Dim username, password As String

Dim temp As Long

Dim r As String = ""

Dim v As String = TextBox1.Text

For Each c In v.ToString

If IsNumeric(c) Then

r = c

Else

r = ((Asc(c) - 65).ToString("00"))

End If

Next

username = r

temp = username * 3 - 500

password = CStr(temp)

TextBox2.Text = password

End Sub

vb.net 如何把大写金额转换成阿拉伯数字金额？

Private Sub Text2_Change() '大写金额转换成阿拉伯数字金额

Dim i As Integer

Dim j As Integer

Dim myint As Integer

Dim myint1 As Integer

Dim mydoub As Double

Dim mystr As String

Dim mystr1 As String

Dim mystr2 As String

Dim mystr3 As String

Dim mystr4 As String

Dim money As Long

Dim money1 As Integer

Dim money2 As Long

mystr = Text2.Text

myint = InStr(mystr, ".")

If myint = 0 Then

mystr = Text2.Text

Else

mystr3 = Right(Text2.Text, Len(Text2.Text) - myint)

If mystr3 "" Then '转换小数位

mystr4 = Left(mystr3, 1)

mystr3 = Right(mystr3, Len(mystr3) - 1)

If mystr4 "0" Then

mystr2 = mystr2 + setdata(Val(mystr4)) + "角"

End If

If mystr3 "" Then

mystr4 = Left(mystr3, 1)

mystr2 = mystr2 + setdata(Val(mystr4)) + "分"

End If

End If

mystr = Left(Text2.Text, myint - 1)

End If

j = Len(mystr)

For i = 1 To Len(mystr) '转换整数位

money2 = Left(mystr, i)

money1 = Right(money2, 1)

If money1 = 0 Then

If j = 5 Then

If Right(mystr1, 1) "万" Then mystr1 = mystr1 "万"

Else

If Right(mystr1, 1) "零" And Right(money, j) 0 Then mystr1 = mystr1 "零"

End If

Else

mystr1 = mystr1 setdata(money1) + chang(j)

End If

j = j - 1

Next i

Text1.Text = mystr1 "元" mystr2 '显示大写

End Sub

vb.net数组型转换为数字型

Dim byts1() As Byte = {255, 255, 0, 0}

'4位16进制数组转Integer

Dim value As Integer = BitConverter.ToInt32(byts1, 0)

'Integer转4位16进制数组()

Dim byts2() As Byte = BitConverter.GetBytes(value)

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