WPF UI interface controls operations across threads

   In WPF applications, if you encounter a multi-threaded demand, will lead to reference WPF control if abnormal, abnormal contents: The calling thread can not access this object because another thread owns the object. As follows: calling code: ThreadcountThread = new Thread (new ThreadStart (Count)); countThread.Start (); Count in the following method call initiator

　　In WPF applications, if you encounter a multi-threaded demand, will lead to reference WPF control if abnormal, abnormal contents: The calling thread can not access this object because another thread owns the object. details as follows:

　　Calling code:

Thread countThread = 

new Thread(new ThreadStart(Count));
countThread.Start();

　　In the Count method called throws an exception as follows

 

 

　　WPF objects are derived from DispatcherObject, which provides the basic structure for handling concurrency and threads. WPF based messaging system scheduler implementation. It works with popular Win32 message pump is very similar; in fact, WPF Scheduler uses User32 message to perform cross-thread calls. When updating UI WPF user thread, to be conducted through Dispatcher.

　　Called See the following code:

namespace WpfThreadTest
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        Thread countThread;
       
        public MainWindow()
        {
            InitializeComponent();
            this.textBox1.Text = DateTime.Now.ToLocalTime().ToString("yyyy年MM月dd日 hh:mm:ss"); ;
            countThread = new Thread(new ThreadStart(DispatcherThread));
        }
        private void button3_Click(object sender, RoutedEventArgs e)
        {
            if (button3.Content.ToString() == "开始时间线程")
            {
                button3.Content = "thread stop time";
                IF (countThread.ThreadState == ThreadState.Suspended)
                {
                    // thread continues
                    countThread.Resume ();
                }
                the else
                    countThread.Start ();
            }
            the else
            {
                button3.Content = "Start Time thread ";  
                // thread suspension
                countThread.Suspend ();
                
            }
        }
        public void DispatcherThread ()
        {
            // update the UI may be controlled by cycling conditions
            the while (to true)
            {
                /// thread priority, maximum timeout, the method delegate (no reference method)
                textBox1.Dispatcher.Invoke (
                    DispatcherPriority.Normal, TimeSpan.FromSeconds (. 1), the Action new new (UpdateTime));
                the Thread. SLEEP (1000);                
            }
        }

        
        Private void UpdateTime ()
        {
            this.textBox1.Text = DateTime.Now.ToLocalTime () the ToString. ( "date YYYY, mM-dd HH: mm: SS");      
        }

        Private void WINDOW_CLOSED (Object SENDER, EventArgs E)
        {
            countThread.Abort ();
            Application.Current.Shutdown ();
        }
    }
}

 

　　Run effect is shown