WPF Binding INotifyPropertyChanged 多线程 深入理解

• 例子

先来看一个例子

Person.cs

public class Person : ObservableObject,INotifyPropertyChanged
    {
        private string _testName;
        private ObservableCollection<string> _names=new ObservableCollection<string>();
 
        public string TestName
        {
            get
            {
                return _testName;
            }
            set
            {
                _testName = value;
                OnPropertyChanged();
            }
        }
 
        public ObservableCollection<string> Names
        {
            get { return _names; }
            set
            {
                _names = value;
                RaisePropertyChanged(()=>Names);
            }
        }
 
        public event PropertyChangedEventHandler PropertyChanged;
 
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

MainWindow.xaml.cs

public partial class MainWindow : Window, INotifyPropertyChanged
    {
        private int _currentId;
        private Person _person;
 
        public Person Person
        {
            get
            {
                return _person;
            }
            set
            {
                _person = value;
                OnPropertyChanged();
            }
        }
 
        public MainWindow()
        {
            InitializeComponent();
 
            this.DataContext = this;
 
            Person = new Person();
 
            Person.TestName = "TestName";
            Person.Names.Add("string");
 
            _currentId = Thread.CurrentThread.ManagedThreadId;
 
            DispatcherHelper.Initialize();
        }
 
        public event PropertyChangedEventHandler PropertyChanged;
 
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
 
        private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
        {
            Task.Factory.StartNew(() =>
            {
                if (_currentId == Thread.CurrentThread.ManagedThreadId)
                {
                    Person = new Person();
                }
                else
                {
                    //你认为属性能够更新到界面上吗？
                    Person.TestName = "NotSame";
 
                    //集合呢？
                    Person.Names.Add("Hello");
                }
            });
 
        }
 
    }

注意注释的地方

结果是TestName属性可以正确更新到UI上，而集合属性Names却不行（这里确实没有搞懂，求教之）。

其余的理解，有一篇写得很好

http://www.cnblogs.com/wpcockroach/p/3909081.html