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폼이 열려 있는지 확인(Check if form is Opened)

Imports System.Linq ' need to add 








If Application.OpenForms().OfType(Of Form2).Any Then


  MessageBox.Show("Opened")


Else


  Dim f2 As New Form2


  f2.Text = "form2"


  f2.Show()


End If

If myForm.IsHandleCreated then


   myForm is open


End If

우수답변 : 

Private Sub OpenWindowsForm(ByVal FormName As String)


    Dim instForm As Form = Application.OpenForms.OfType(Of Form)().Where(Function(frm) frm.Name = FormName).SingleOrDefault()


    If instForm Is Nothing Then


        Dim frm As New Form


        frm = DirectCast(CreateObjectInstance(FormName), Form)


        frm.MdiParent = Me


        Me.Panel1.Controls.Add(frm)


        Me.Panel1.Tag = frm


        frm.Show()


    Else


        instForm.Select()


        instForm.WindowState = FormWindowState.Maximized


        instForm.BringToFront()


    End If


End Sub





Public Function CreateObjectInstance(ByVal objectName As String) As Object


    Dim obj As Object


    Try


        If objectName.LastIndexOf(".") = -1 Then


            objectName = [Assembly].GetEntryAssembly.GetName.Name & "." & objectName


        End If





        obj = [Assembly].GetEntryAssembly.CreateInstance(objectName)





    Catch ex As Exception


        obj = Nothing


    End Try


    Return obj


End Function

Private Sub btnBusqueda_Click(sender As Object, e As EventArgs) Handles btnBusqueda.Click


    OpenWindowsForm("Busqueda")


End Sub





Private Sub btnCalendario_Click_1(sender As Object, e As EventArgs) Handles btnCalendario.Click


    OpenWindowsForm("Calendario")


End Sub

Dim frmCollection = System.Windows.Forms.Application.OpenForms


If frmCollection.OfType(Of Form2).Any Then


    frmCollection.Item("Form2").Activate()


Else


    Dim newForm2 = New Form2


    newForm2.Show()


End If

    Dim xChildWindows = Application.OpenForms.OfType(Of frmForm2)


    If xChildWindows.Any Then


        xChildWindows.First().Focus() 'Focus if exists


    Else


        Dim xfrmNew As New frmForm2() 'Open window if doeasn't exists


        xfrmNew.MdiParent = Me


        xfrmNew.Show()


    End If

Dim formText As String


Dim prevText As String





 Private Sub OpenForm(ByVal frm As Windows.Forms.Form)


        formText = frm.Text


        If formText = prevText Then Exit Sub


        CloseForms()


        ' Make it a child of this MDI form before showing it.


        frm.MdiParent = Me


        frm.Show()


        frm.Location = New Point(0, 0)


        prevText = formText


    End Sub





    Private Sub CloseForms()


        For Each ChildForm As Form In Me.MdiChildren


            ChildForm.Close()


        Next


    End Sub





    Private Sub NewToolStripButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PayablesToolStripMenuItem.Click


            OpenForm(frmPayables)


    End Sub