Two dimension int array custom dependencyProperty binding not working

Question

Binding Source

    private int[,] _map = new int[22, 12] 
    {
        { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
        { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
    };
    public int[,] Map
    {
        get => _map;
        set => SetProperty(ref _map, value);
    }

DependencyProperty

public static readonly DependencyProperty MapArrayProperty =
        DependencyProperty.Register
        (
            "MapArray",
            typeof(int[,]),
            typeof(MapControl),
            new PropertyMetadata
            (
                null,
                new PropertyChangedCallback(MapArrayChanged)
            )
        );

    private static void MapArrayChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        MapControl map = (MapControl)d;
        map.MapChanged();
    }

    public int[,] MapArray
    {
        get
        {
            return (int[,])GetValue(MapArrayProperty);
        }
        set
        {
            SetValue(MapArrayProperty, value);
        }
    }

    private void MapChanged()
    {
        for(int i = 0; i<MapArray.GetLength(0); i++)
        {
            for(int j = 0; j<MapArray.GetLength(1); j++)
            {
                Grid grid = new Grid();
                grid.Background = ColorSeletor(MapArray[i, j]);
                Grid.SetRow(grid, i);
                Grid.SetColumn(grid, j);
                GridMap.Children.Add(grid);
            }
        }
    }

start button binding source

    public ICommand StartCommand
    {
        get;
        set;
    }
    private void RandomBlockSelector()
    {
        IDefaultBlock defaultBlock = null;
        Random r = new Random();
        int selectedblock = r.Next(2, 9);
        switch (selectedblock)
        {
            case 2:
                defaultBlock = new IBlock();
                break;
            case 3:
                defaultBlock = new JBlock();
                break;
            case 4:
                defaultBlock = new LBlock();
                break;
            case 5:
                defaultBlock = new OBlock();
                break;
            case 6:
                defaultBlock = new SBlock();
                break;
            case 7:
                defaultBlock = new TBlock();
                break;
            case 8:
                defaultBlock = new ZBlock();
                break;
        }
        InsertBlock(defaultBlock.BlockArray);
    }

    private void InsertBlock(int[,] blockShape)
    {
        for(int i = 4; i<8; i++)
        {
            for(int j = 1; j<5; j++)
            {
                Map[i, j] = blockShape[i - 4, j - 1];
            }
        }
    }

    private void Start()
    {
        RandomBlockSelector();
    }

If i start app, binding is working

but if i click button, binding is not working i think that when i click button to revise array the array must be revise and a property change event must occur to change view

If there is another way to bind a 2D array please let me know or could you find error in my code

This is what should appear in the view after the button is clicked if it works

Answer 1

First the Disclaimer:

WPF, Windows forms and other Desktop application formats are not the right tool for game development. The right tool is anything with a game loop . XNA is slightly dated, but there is a whole list of possible current frontends .

The issue is that your collection does not have Change notification in case a collection value changes. What you would need is a ObservableCollection or other "made for WPF" Collection. A ObservableCollection<int>[] - a array of ObservableCollection instances - is propably the droid you are looking for. But a ObservableCollection<ObservableCollection<int>> might be a better choice (you may want to use aliases to keep those types readable).