C#基于事件异步模式的实现2（续）

1、代码

private void button2_Click(object sender, EventArgs e)
        {
            listBox1.Items.Add($"The thread id is {Thread.CurrentThread.ManagedThreadId}");

            BackgroundWorker worker = new BackgroundWorker();
            worker.DoWork += new DoWorkEventHandler((s1, s2) =>
            {
                Thread.Sleep(2000);
                ListBoxAcrossDomain(listBox1,$"The asynchronous thread id is {Thread.CurrentThread.ManagedThreadId}");
            });
            listBox1.Items.Add($"The test is start");
            //注册事件来实现异步
            worker.RunWorkerAsync(this);
            listBox1.Items.Add($"The test is end");
        }

        public static void ListBoxAcrossDomain(ListBox listBox,string text)
        {
            if(listBox == null) return;
            if(listBox.InvokeRequired)
            {
                listBox.Invoke(new Action(() => { listBox.Items.Add(text); }));
            }
            else
            {
                listBox.Items.Add(text);
            }
        }

2、运行结果