Question

我希望能够在我的Gird中更新ComboBox。我假设我需要某种事件系统。

我把它绑定如下：

<ComboBox Name="ScreenLocations" Grid.Row="1" Margin="0,0,0,175" ItemsSource="{Binding Path=CurrentPlayer.CurrentLocation.CurrentDirections}" DisplayMemberPath="Name" SelectedValuePath="Name" SelectedValue="{Binding Path= Location}"/>

我的xaml.cs如下：

public partial class MainWindow : Window
{
     GameSession _gameSession;

    public MainWindow()
    {
        InitializeComponent();

        _gameSession = new GameSession();
        DataContext = _gameSession;

    }
}

我希望能够更改CurrentDirections属性并在UI中更新。

我所拥有的类和属性是：

public  class Location
{
    public int ID { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }       
    public Quest[] AvailableQuests { get; set; }
    public Monster[] LocationMonsters { get; set; }
    public Location[] CurrentDirections { get; set; }


    public Location(string name, string description, Quest[] availableQuests, int id)
    {
        Name = name;
        Description = description;         
        AvailableQuests = availableQuests;
        ID = id;
        CurrentDirections = new Location[] { };
        LocationMonsters = new Monster[] { };
        AvailableQuests = new Quest[] { };
    }
}

Answer 1

您只需要在类Location上实现接口System.ComponentModel.INotifyPropertyChanged。这将迫使您定义一个PropertyChanged事件，感兴趣的各方（例如绑定的ComboBox）可以订阅以检测更改，然后您可以按如下方式重新实现CurrentDirections，以便通过此事件通知感兴趣的各方：

private Location[] currentDirections;
public  Location[] CurrentDirections 
{ 
    get {return currentDirections;} 
    set {currentDirections = value;  if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("CurrentDirections"));}
}

为了完整性，您应该考虑在Player上实现此接口，以及Location的其他属性。

DataContext：更新comboBox的ItemSource

1 个答案: