如何在线程中转换此代码 [英] how to convert this code in threading

问题描述

private void OnCallStateChanged(object sender, CallStateEventArgs e)
        {
            if (this.InvokeRequired)
            {
                EventHandler<callstateeventargs> eh = OnCallStateChanged;
                this.BeginInvoke(eh, new object[] { sender, e });
                return;
            }

            TapiLine line = (TapiLine)sender;
            TapiCall call = e.Call;

            foreach (ListViewItem lvi in lst_call_Monitoring.Items)
            {


                if (lvi.Tag == call)
                {

                    lvi.SubItems[COLUMNS_STATE].Text = call.CallState.ToString();
                    if (GetActiveCall() == call)
                        AdjustButtonState(call);


                    if (call.CallState == CallState.Idle)
                    {
                        call.Dispose();
                        lst_call_Monitoring.Items.Remove(lvi);

                    }

                    else if (call.CallState.ToString() == "Ringing")
                    {
                        lvi.BackColor = Color.DarkBlue;
                    }

                    else if (call.CallState.ToString() == "Ringback")
                    {
                        lvi.BackColor = Color.DarkOrange;
                    }

                    else if (call.CallState.ToString() == "Dialtone")
                    {
                        lvi.BackColor = Color.DarkRed;
                    }

                    else if (call.CallState.ToString() == "Offering")
                    {
                        lvi.BackColor = Color.DarkOrange;
                    }

                    else if (call.CallState.ToString() == "Connected")
                    {
                        lvi.BackColor = Color.DimGray;

                        stopwatch.Start();

                        Thread.Sleep(1);
                        lvi.SubItems[8].Text = stopwatch.Elapsed.ToString();

                    }
                    else if (call.CallState.ToString() == "Disconnected")
                    {
                        lvi.BackColor = Color.DarkRed;
                        stopwatch.Stop();
                        lvi.SubItems[8].Text = stopwatch.Elapsed.ToString();

                    }

                }
            }

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