VB.NET ，文本框限制輸入數(shù)字個數(shù)。例如不低于5位數(shù)而不大于11位數(shù)。違反則有提示。

input type="text" maxlength="11" /這是控制最大輸入字?jǐn)?shù)至于不能少于11個字，需要在點擊保存按鈕時，通過.length來控制

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如何在VB.NET 中限制文本框中只能輸入數(shù)字

以下是只能輸入數(shù)字和小數(shù)點，并且小數(shù)點只能輸入一次

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Textbox1.KeyPress

If Char.IsDigit(e.KeyChar) or e.KeyChar = Chr(8) or e.KeyChar = "." Then

If e.KeyChar = "." And InStr(TextBox1.Text, ".") 0 Then

e.Handled = True

Else

e.Handled = False

End If

Else

e.Handled = True

End If

End Sub

VB.NET如何限制textbox只能輸入數(shù)字和大寫字母？

Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged

Dim s As String = TextBox1.Text

If Not ((Mid(s, Len(s), 1) = "0" And Mid(s, Len(s), 1) = "9") Or (Mid(s, Len(s), 1) = "A" And Mid(s, Len(s), 1) = "Z")) Then

s = Microsoft.VisualBasic.Left(s, Len(s) - 1)

TextBox1.Text = s

TextBox1.SelectionStart = Len(TextBox1.Text)

End If

End Sub