限制可以输入Windows窗体文本框的字符数

Question

假设我有一个Windows窗体文本框，并希望减少通过用户输入允许的最大字符数，我该怎么做？

Answer 1

Set the MaxLength property. No code required, you can set it in the designer.

Answer 2

您可以使用MaxLength属性设置文本框中允许的最大字符数。

Answer 3

Set MaxLength does not work with isNumber=true, you still can input 00012 regardless of limit = 4

My solution:

Protected Overridable Sub szSeqNmbr_KeyPress(ByVal eventSender As System.Object, ByVal    eventArgs As System.Windows.Forms.KeyPressEventArgs) Handles szAuthID.KeyPress
    Dim KeyAscii As Short = Convert.ToInt32(eventArgs.KeyChar)

    If (szAuthID.Text.Length >= szAuthID.MaxLength) Then
        'szAuthID.Text = szAuthID.Text.Substring(0, szAuthID.MaxLength)
        If (KeyAscii >= 48 And KeyAscii <= 57) Then
            eventArgs.Handled = True
            Return
        End If
    End If
End Sub