[英]VB.NET: Manipulating TextBox Input: Dash every 5 characters and removing special characters
Essentially I am trying to replicate the Windows 7 (In-Windows) activation key TextBox form. 基本上我正在尝试复制Windows 7(In-Windows)激活密钥TextBox表单。 The Form where it will auto capitalize letters, remove or deny all non alphanumeric characters except dashes every 5 characters that will be auto-input.
表单,它将自动大写字母,删除或拒绝所有非字母数字字符,除了破折号,每5个字符将自动输入。
I assume this can be done with a fairly complicated replacement Regular Expression but I cannot seem to create one to fit the needs. 我认为这可以通过相当复杂的替换正则表达式来完成,但我似乎无法创建一个以满足需要。
This is an Example of what I have right now, but it creates an infinite loop as it removes all characters including dashes, than adds a dash, which changes the text and removes the dash again. 这是我现在所拥有的一个示例,但它创建了一个无限循环,因为它删除了所有字符,包括破折号,而不是添加破折号,这会更改文本并再次删除破折号。
Any suggestions, solutions or ideas would be appreciated! 任何建议,解决方案或想法将不胜感激!
Code modified from original question to the solution I am using: 代码从原始问题修改为我正在使用的解决方案:
Private Sub aKeyTextField_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles aKeyTextField.KeyPress
'Test only
If Char.IsLetterOrDigit(e.KeyChar) Then
Dim test As String = ""
Select Case e.KeyChar
Case "0" To "9"
' Do nothing
Case "a" To "z"
e.KeyChar = Char.ToUpper(e.KeyChar)
Case Else
e.Handled = True
End Select
ElseIf Not e.KeyChar = Convert.ToChar(8) Then
e.KeyChar = ""
End If
Dim strKeyTextField As String = aKeyTextField.Text
Dim n As Integer = 5
Dim intlength As Integer = aKeyTextField.TextLength
If Not e.KeyChar = Convert.ToChar(8) Then
While intlength > 4 And intlength < 29
If aKeyTextField.Text.Length = 5 Then
strKeyTextField = strKeyTextField.Insert(5, "-")
End If
Dim singleChar As Char
singleChar = strKeyTextField.Chars(n)
While (n + 5) < intlength
If singleChar = "-" Then
n = n + 6
If n = intlength Then
strKeyTextField = strKeyTextField.Insert(n, "-")
End If
End If
End While
intlength = intlength - 5
End While
aKeyTextField.Text = strKeyTextField
'sets focus at the end of the string
aKeyTextField.Select(aKeyTextField.Text.Length, 0)
Else
Select Case aKeyTextField.Text.Length
Case 7
strKeyTextField = strKeyTextField.Remove(5, 1)
Case 13
strKeyTextField = strKeyTextField.Remove(11, 1)
Case 19
strKeyTextField = strKeyTextField.Remove(17, 1)
Case 25
strKeyTextField = strKeyTextField.Remove(23, 1)
Case Else
End Select
aKeyTextField.Text = strKeyTextField
aKeyTextField.Select(aKeyTextField.Text.Length, 0)
End If
End Sub
Public Sub New()
' This call is required by the designer.
InitializeComponent()
' Add any initialization after the InitializeComponent() call.
Dim blankContextMenu As New ContextMenu
aKeyTextField.ContextMenu = blankContextMenu
End Sub
Have a look at the MaskedTextBox . 看看MaskedTextBox 。 You should be able to achieve your aims with little code and not need the regex.
你应该能够用很少的代码实现你的目标,而不需要正则表达式。
This works, it could prob do with tidying up and comments but I just wanted to see if I could get this working: 这是有效的,它可能与整理和评论有关,但我只是想看看我是否可以使这个工作:
Private Sub aKeyTextField_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles aKeyTextField.KeyPress
'Test only
If Char.IsLetterOrDigit(e.KeyChar) Then
Dim test As String = ""
Select Case e.KeyChar
Case "0" To "9"
' Do nothing
Case "a" To "z"
e.KeyChar = Char.ToUpper(e.KeyChar)
Case Else
e.Handled = True
End Select
Else
e.KeyChar = ""
End If
Dim strKeyTextField As String = aKeyTextField.Text
Dim n As Integer = 5
Dim intlength As Integer = aKeyTextField.TextLength
While intlength > 4
If aKeyTextField.Text.Length = 5 Then
strKeyTextField = strKeyTextField.Insert(5, "-")
End If
Dim singleChar As Char
singleChar = strKeyTextField.Chars(n)
While (n + 5) < intlength
If singleChar = "-" Then
n = n + 6
If n = intlength Then
strKeyTextField = strKeyTextField.Insert(n, "-")
End If
End If
End While
intlength = intlength - 5
End While
aKeyTextField.Text = strKeyTextField
'sets focus at the end of the string
aKeyTextField.Select(aKeyTextField.Text.Length, 0)
End Sub
我建议不要在TextBox
的TextChangedEvent
上执行此操作,以在要备份文本框的属性的Set
方法中处理此问题。
Look like you have the ^ in the wrong place here, it needs to be inside the square brackets, also remove the {5}-, this will then remove all the non alphanumeric characters. 看起来你在这里错误的地方^,它需要在方括号内,也删除{5} - ,这将删除所有非字母数字字符。
If m.Success Then
aKeyTextField.Text = Regex.Replace(aKeyTextField.Text, "[^a-zA-Z0-9]+, "")"
aKeyTextField.SelectionStart = aKeyTextField.TextLength
End If
This code below will only put a - at the 5th position only and you need to add it to every 5 characters, create a loop / get the length and divide by 5 and add a "-" every 5 position. 下面的代码只会放置 - 在第5位,你需要将它添加到每5个字符,创建一个循环/得到长度并除以5并在每5个位置添加一个“ - ”。
If aKeyTextField.TextLength > 5 Then
aKeyTextField.Text = aKeyTextField.Text.Insert(5, "-")
aKeyTextField.SelectionStart = aKeyTextField.TextLength
End If
Something like this would work instead: 这样的东西会起作用:
Dim n As Integer = 5
Dim intlength As Integer = aKeyTextField.Length
While intlength > 0 And n < intlength
aKeyTextField = aKeyTextField.Insert(n, "-")
intlength = intlength - 5
n = n + 6
End While
To stop the infinite looping change the event to Validating instead: 要停止无限循环,请将事件更改为“验证”:
Private Sub aKeyTextField_TextValidating(ByVal sender As Object, ByVal e As System.EventArgs) Handles aKeyTextField.Validating
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.