用C#代码怎么实现WPF中实现不同页面相同ComboBox控件绑定数据源数据的同步

好的，以下是用C#代码实现WPF中实现不同页面相同ComboBox控件绑定数据源数据的同步的方法：

1. 首先，创建一个ViewModel类，并在其中定义ComboBox的数据源和选中项属性，同时实现INotifyPropertyChanged接口，如下所示：

public class MyViewModel : INotifyPropertyChanged
{
    private ObservableCollection<string> _itemsSource;
    private string _selectedItem;

    public ObservableCollection<string> ItemsSource
    {
        get { return _itemsSource; }
        set
        {
            _itemsSource = value;
            OnPropertyChanged("ItemsSource");
        }
    }

    public string SelectedItem
    {
        get { return _selectedItem; }
        set
        {
            _selectedItem = value;
            OnPropertyChanged("SelectedItem");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

2. 在每个页面的代码中，创建一个MyViewModel实例，并将ComboBox的ItemsSource和SelectedValue属性分别绑定到ViewModel中对应的属性，如下所示：

public partial class Page1 : Page
{
    private MyViewModel _viewModel;

    public Page1()
    {
        InitializeComponent();

        _viewModel = MyViewModel.Instance;
        comboBox1.ItemsSource = _viewModel.ItemsSource;
        comboBox1.SetBinding(ComboBox.SelectedValueProperty, new Binding("SelectedItem") { Mode = BindingMode.TwoWay });
    }
}

public partial class Page2 : Page
{
    private MyViewModel _viewModel;

    public Page2()
    {
        InitializeComponent();

        _viewModel = MyViewModel.Instance;
        comboBox1.ItemsSource = _viewModel.ItemsSource;
        comboBox1.SetBinding(ComboBox.SelectedValueProperty, new Binding("SelectedItem") { Mode = BindingMode.TwoWay });
    }
}

3. 在MyViewModel类中使用Singleton模式创建一个实例，确保所有页面使用的是同一个ViewModel对象，如下所示：

public class MyViewModel : INotifyPropertyChanged
{
    private static MyViewModel _instance;
    private ObservableCollection<string> _itemsSource;
    private string _selectedItem;

    public static MyViewModel Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = new MyViewModel();
            }
            return _instance;
        }
    }

    public ObservableCollection<string> ItemsSource
    {
        get { return _itemsSource; }
        set
        {
            _itemsSource = value;
            OnPropertyChanged("ItemsSource");
        }
    }

    public string SelectedItem
    {
        get { return _selectedItem; }
        set
        {
            _selectedItem = value;
            OnPropertyChanged("SelectedItem");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

这样就可以在不同页面中实现ComboBox控件绑定数据源数据的同步了。需要注意的是，要确保ViewModel的生命周期和页面的生命周期一致，否则可能会出现数据同步不成功的情况。