C#WPF使用委托修改UI控件

"WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" 350" 525" WindowStartupLocation="CenterScreen" Loaded="Window_Loaded">
    
        
            "Stretch" Margin="12" Name="richTextBox1" VerticalAlignment="Stretch" />
        
    

 1         private void Window_Loaded(object sender, RoutedEventArgs e)
 2         {
 3             //创建线程1
 4             Thread t1 = new Thread(new ThreadStart(T1));
 5             t1.Start();
 6 
 7             //创建线程2
 8             Thread t2 = new Thread(new ThreadStart(T2));
 9             t2.Start();
10         }

        /// 

        /// 线程1调用函数
        /// add by 
        /// 
        private void T1()
        {
            while (true)
            {
                Thread.Sleep(TimeSpan.FromSeconds(1));
                ShowMsg(string.Format("T1 {0}", System.DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss:fff")));
            }
        }
        /// 

        /// 线程2调用函数
        /// add by 
        /// 
        private void T2()
        {
            while (true)
            {
                Thread.Sleep(TimeSpan.FromSeconds(1));
                ShowMsg(string.Format("T2 {0}", System.DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss:fff")));
            }
        }

        private void ShowMsg(string sMsg)
        {
            this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (ThreadStart)delegate() {
                richTextBox1.AppendText(string.Format("{0} \r\n",sMsg));
            });
        }