TextBox还有一个 AcceptsTab 属性，当 Multiline = True 。

The TextBox also has an AcceptsTab property that works when Multiline = True.

有了这些条件，您现在可以看到是否按Tab键：

With those conditions, you can now see if the tab key was pressed:

Private Sub TextBox1_KeyDown(sender As Object, e As KeyEventArgs) _
                             Handles TextBox1.KeyDown
  If e.KeyCode = Keys.Tab Then
    e.SuppressKeyPress = True
    'do something
  End If
End Sub