无法将打开的表单带到前台/焦点vb.net

Question

嗨，我有五种形式，并且我只想在未打开的情况下打开一种形式，如果它是开放的，那么请先关注或关注。 我曾尝试使用BringToFront ， Show和TopMost但没有任何效果。

If Not Application.OpenForms.OfType(Of StudentRegistrationFrm).Any Then
        StudentRegistrationFrm.ShowDialog()
    Else
        StudentRegistrationFrm.BringToFront()
        'Me.SendToBack()
End If

Answer 1

我已经通过关闭当前表单解决了它。

 If Not Application.OpenForms.OfType(Of StudentRegistrationFrm).Any Then
        StudentRegistrationFrm.Show()
    Else
        Me.Close()
    End If
   Private Sub StudentInformationToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles StudentInformationToolStripMenuItem.Click
    Dim studentReg As StudentInfoFrm = New StudentInfoFrm
    studentReg.Show()
    Me.Close()
 End Sub