C＃，WPF绑定，MVVM，INotifyPropertyChanged，尝试绑定实例属性但未成功

Question

Is there a way to put instances of a class, inside another class, and then have the UI update from them with INotifyPropertyChanged? For example these PlayerBaseClass instances PlayerOne and PlayerTwo inside the WhiteJack class, and have them updated in the UI? The only solution that works is to have the context set directly to the instance of the players, and then feed them into the viewmodel which is the main view model..!

   class MultipleDataContexts
    {
        public WhiteJack WhiteJackViewModel { get; set; }
        public PlayerBaseClass PlayerOne { get; set; }
        public PlayerBaseClass PlayerTwo { get; set; }
        public MultipleDataContexts()
        {
            PlayerOne = new PlayerBaseClass();
            PlayerTwo = new PlayerBaseClass();
            WhiteJackViewModel = new WhiteJack(PlayerOne, PlayerTwo);
        }
    }
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            this.DataContext = new MultipleDataContexts(); // set datacontext for the INotifyPropertyChanged
            InitializeComponent();
            this.WindowState = WindowState.Maximized; //Window to the max.
        }
}

Im guessing that this is the only way it will work. The View has to see directly into the set contexts, it cant see into its members. Am I right? Because this did not work:

this.DataContext = new WhiteJack();

Yeah, no. I cant get the UI to update with binding the textblocks to instances inside WhiteJack, no matter if I set the context to a named instance or not.

Answer 1

You're setting the DataContext for this (the Window) to a new Instance of WhiteJack(). I'm still not sure exactly what your end goal is but instantiating your two PlayerBaseClass objects in your MultipleDataContexts class will allow you to set the Background using the properties you have created. So set your Color in your ViewModel:

MODEL

class MultipleDataContexts
{
    public PlayerBaseClass PlayerOne { get; set; }
    public PlayerBaseClass PlayerTwo { get; set; }
    public MultipleDataContexts()
    {
        PlayerOne = new PlayerBaseClass();
        PlayerTwo = new PlayerBaseClass();
    }
}

VIEWMODEL

        MultipleDataContexts mdc = new MultipleDataContexts();
        mdc.PlayerOne.TextBlock_Background = new SolidColorBrush(Colors.Red);
        mdc.PlayerTwo.TextBlock_Background = new SolidColorBrush(Colors.Black);
        this.DataContext = mdc;

XAML

    <TextBlock x:Name="SeatOne_TextBlock" HorizontalAlignment="Left" Text="text" Background="{Binding PlayerOne.TextBlock_Background}" VerticalAlignment="Top"  Opacity="1" Height="155" Width="105" FontFamily="Courier New" Padding="0" Margin="0" />
    <TextBlock x:Name="SeatTwo_TextBlock" HorizontalAlignment="Left" Text="text" Background="{Binding PlayerTwo.TextBlock_Background}" VerticalAlignment="Top"  Opacity="1" Height="155" Width="105" FontFamily="Courier New" Padding="0" Margin="0" />

Setting these properties and binding the MultipleDataContexts class to my Window gives me a red and a black textblock background.