How to remove all handle in a event

[manhit45]

I have a event and have many handles. How can i remove all handles but dont know exactly name of any handle/.

[jmcilhinney]

I have a event and have many handles. How can i remove all handles but dont know exactly name of any handle/.

As far as I'm aware, you can't. If you're adding handlers then you know what you're adding, so you should know what you need to remove. It's up to you to write good code, which this is part of. In general, the code module that does something is responsible for undoing it, e.g. creating and destroying an object or adding and removing a handler.

[manhit45]

    Private Sub dtgcapnhatthongtin_KeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles dtgcapnhatthongtin.KeyDown
        If cobcapnhatthongtin.SelectedIndex = 2 Then
            Dim dt As DataTable = dat.GetDanhSachMonAn

            ContextMenuStrip1.Items.Clear()

            Dim tollnhande As New ToolStripMenuItem
            tollnhande.Text = "Lựa chọn thực đơn :"
            tollnhande.Font = New System.Drawing.Font("Microsoft Sans Serif", 8.25!, System.Drawing.FontStyle.Italic, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
            tollnhande.ForeColor = System.Drawing.SystemColors.Desktop
            ContextMenuStrip1.Items.Add(tollnhande)

            For i As Integer = 0 To dt.Rows.Count - 1
                If dt.Rows(i)(2).ToString.Substring(0, 1) = e.KeyCode.ToString Then
                    Dim toll As New ToolStripMenuItem
                    toll.Text = dt.Rows(i)(2).ToString
                    AddHandler toll.Click, AddressOf ToolStripItemclick_Click
                    ContextMenuStrip1.Items.Add(toll)
                End If
            Next
            If ContextMenuStrip1.Items.Count > 1 Then
                Dim rec As Rectangle
                rec = dtgcapnhatthongtin.GetCellDisplayRectangle(2, 1, True)
                ContextMenuStrip1.Show(dtgcapnhatthongtin, New Point(rec.X, rec.Y))
            End If
        End If
    End Sub

    Private Sub ToolStripItemclick_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Try
            If cobcapnhatthongtin.SelectedIndex = 2 Then
                For i As Integer = 0 To dtgcapnhatthongtin.RowCount - 1
                    If dtgcapnhatthongtin.Rows(i).Cells(2).Value = DirectCast(sender, ToolStripMenuItem).Text Then
                        dtgcapnhatthongtin.CurrentCell = dtgcapnhatthongtin(0, i)
                        Exit Sub
                    End If
                Next
            End If
          
        Catch ex As Exception
            MessageBoxEx.Show("Đã xảy ra sự cố : " & ex.Message, "Thông báo sự cố", MessageBoxButtons.OK, MessageBoxIcon.Asterisk)
        End Try
    End Sub

That is code i add handle to ToolStripItemclick_Click event.
How can i remove all handles of that event.
I am goting to named for each toolstripitem before add handle.

[jmcilhinney]

It's not like you're adding multiple handlers for the same event. You're simply adding one handler to the Click event of each item in ContextMenuStrip1. As such, all you need to do is loop through those items and remove a handler from each one.

[techgnome]

Well, if you know about AddHandler, then surely you know about RemoveHandler, right?

-tg

[manhit45]

It's not like you're adding multiple handlers for the same event. You're simply adding one handler to the Click event of each item in ContextMenuStrip1. As such, all you need to do is loop through those items and remove a handler from each one.

Sorry, yes.