限制VB文本框输入的代码

1.只能输入数字和Backspace键

Private Sub txtSID_KeyPress(KeyAscii As Integer)
If KeyAscii = 8 Then
ElseIf KeyAscii < Asc(“0”) Or KeyAscii > Asc(“9”) Then
KeyAscii = 0
End If
End Sub

2. 只能输入大小写英文字母和汉字（包括退格和回车）

Private Sub txtName_KeyPress(KeyAscii As Integer)
If KeyAscii < 0 Or KeyAscii = 8 Or KeyAscii = 13 Then
ElseIf Not Chr(KeyAscii) Like “[a-zA-Z]” Then
KeyAscii = 0
End If
End Sub

3. 只能输入汉字

Private Sub txtDirector_KeyPress(KeyAscii As Integer)
If KeyAscii < 0 Or KeyAscii = 8 Then Exit Sub
KeyAscii = 0 ‘不能输入
End Sub

4.限制字符输入

1.Private Sub txtUserName_KeyPress(KeyAscii As Integer)
Select Case KeyAscii
Case 8
Case Asc(“A”) To Asc(“Z”)
Case Asc(“0”) To Asc(“9”)
Case Asc(“a”) To Asc(“z”)
Case Is < 0
Case Else
KeyAscii = 0
End Select
End Sub

2.Private Sub txtUserName_Change()
Dim a As String
Dim i As Integer
a = “’!@#$%^&*()_+ “””
For i = 1 To 20
txtUserName.Text = Replace(txtUserName.Text, Mid(a, i, 1), “”)
Next
End Sub
注：这段代码就是限制了a中的特殊符号，如果还想限制别的特殊符号可以在a变量中继续添加。