Controlling to prevent window from opening again in Mdiform

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How do I check if a window has been opened? If it has been opened, bring it forward, otherwise open a new window. That is, I need to control the windows, checking them so that only one is open.

c# winforms

  • Explain better what you want to know. You want to control so that only one application instance is opened?

  • http://sanity-free.org/143/csharp_dotnet_single_instance_application.html

1 answer

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Easy. In the event you are currently opening the window, place the following condition:

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Dim fEncontrou As Boolean = False
    For Each f As Form In Application.OpenForms
        If f.Name = "Form2" Then
            fEncontrou = True
            f.BringToFront()
            f.Activate()
            Exit For
        End If
    Next
    If Not fEncontrou Then Form2.Show()
End Sub

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