VBA如果逻辑使用Asc功能

Question

我有一个包含TextBox的userform。我创建了一个If函数来验证用户是否输入了字母。我在代码上遇到运行时错误13。如果我能正确地做出if逻辑，请帮助我。

Private Sub cmd_Submit_Click()
    'it will not accept any ASCII variables from 0 to 65
    If Name_Box.Text < Asc(65) Then
        MsgBox "Enter A to Z"
        'Shall not contain any ASCII characters past 90
    ElseIf Name_Box.Text > Asc(90) Then
        MsgBox "Enter A to Z"
    Else

    End If
End Sub

Answer 1

尝试此功能：

Private Sub cmd_Submit_Click()
    For i = 1 To Len(Name_Box.Text)
        If Asc(Mid(Name_Box.Text, i, 1)) < 65 Or Asc(Mid(Name_Box.Text, i, 1)) > 90 Then
            MsgBox "Enter A to Z"
            Exit For
        End If
    Next i
End Sub