Question

我在MainWindow.xaml中有Grid。 Grid已填充UserControl（修改后的Button）。

在静态类Globals中，我有bool varible，它在Button按下时会发生变化。现在我需要在这个bool变量上更改Grid背景颜色。

麻烦的是，我无法从其他MainWindow.xaml.cs代码中找到Grid。

Global.cs：

public static class Globals
    {
        private static bool _player;
        public static bool Player {
            get { return _player; }

            set {
                _player = value;
                Debug.WriteLine(value);
            }
        }
    }

我的UserControl：

public partial class tetrisButton : UserControl
    {
        public tetrisButton()
        {
            InitializeComponent();
            Button.Focusable = false;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if(!Globals.Player)
            {
                Button.Content = new cross();
                Globals.Player = true;
            }
            else
            {
                Button.Content = new circle();
                Globals.Player = false;
            }

        }
    }

Answer 1

您可以使用UserControl方法获取Window.GetWindow的父窗口的引用：

private void Button_Click(object sender, RoutedEventArgs e)
{
    MainWindow mainWindow = Window.GetWindow(this) as MainWindow;
    if (!Globals.Player)
    {
        Button.Content = new cross();
        Globals.Player = true;

        if (mainWindow != null)
            mainWindow.grid.Background = Brushes.Green;
    }
    else
    {
        Button.Content = new circle();
        Globals.Player = false;

        if (mainWindow != null)
            mainWindow.grid.Background = Brushes.Red;
    }
}

为了能够访问Grid，您可以在x:Name的XAML标记中为其MainWindow.xaml：

<Grid x:Name="grid" ... />

Answer 2

如果你没有实现MVVM模式（或类似），你可以获得包含网格并设置颜色：

public partial class tetrisButton : UserControl
{
    public tetrisButton()
    {
        InitializeComponent();
        Button.Focusable = false;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        Grid parent = FindParent<Grid>(this);

        if(!Globals.Player)
        {
            Button.Content = new cross();
            Globals.Player = true;
            parent.Background = Brushes.Blue;
        }
        else
        {
            Button.Content = new circle();
            Globals.Player = false;
            parent.Background = Brushes.Red;
        }

    }

    private T FindParent<T>(DependencyObject child) where T : DependencyObject
    {
         T parent = VisualTreeHelper.GetParent(child) as T;

         if (parent != null)
             return parent;
         else
             return FindParent<T>(parent);
    }
}

如何从静态类更改UserControl属性？

2 个答案: