c# - Is it possible to change the Visibility property of a TextBox with the click of a button in another class(another wpf window)?

Question

I'm trying to change the Visibility property of a TextBox in one window by clicking the button in another window. It does not work with the current code i have. It is easy to do with a button and a TextBox that are in the same class but in separate classes it doesn't work. This is the code behind for the window that has the button i want to press to change the other window's textbox.

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();
    }

    private void Button2_Click(object sender, RoutedEventArgs e)
    {
        MainWindow mainWindow = new MainWindow();

        mainWindow.Box.Visibility = Visibility.Visible;
    }
}

}

this is the code for the window whose textbox i want to change

<Grid Background="Blue">
    <Grid.ColumnDefinitions>
        <ColumnDefinition/>
        <ColumnDefinition/>
    </Grid.ColumnDefinitions>

    <TextBox Name="Box" Text="" Visibility="Hidden"/>
    <Button Name="Buttons" Grid.Column="1" Content="Button" Click="Button_Click"/>
</Grid>

 public partial class MainWindow : Window
{

    public MainWindow()
    {
        InitializeComponent();

        Window1 window1 = new Window1();
        window1.Show();

    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        Box.Visibility = Visibility.Visible;
    }
}

}

标签： c#wpf

Answer 1

是的！您可以为此使用 Mediator 类

public class Mediator
{
    static readonly Mediator instance = new Mediator();

    public static Mediator Instance
    {
        get
        {
            return instance;
        }
    }

    private Mediator()
    {

    }


    private static Dictionary<string, Action<object>> subscribers = new Dictionary<string, Action<object>>();


    public void Register(string message, Action<object> action)
    {
        subscribers.Add(message, action);
    }


    public void Notify(string message, Object param)
    {
        foreach (var item in subscribers)
        {

            if (item.Key.Equals(message))
            {
                Action<object> method = (Action<object>)item.Value;
                method.Invoke(param);
            }
        }
    }
}

将此类添加到您的项目中，然后我主窗口的构造函数您创建调解器实例

    Mediator _Mediator
    public MainWindow()
    {
        InitializeComponent();
        _Mediator= Mediator.Instance;
         _Mediator.Register("ButtonVisibility",ChangeButtonVisibility);

    }
    private void ChangeButtonVibility(object obj)
    {
      this.button.Visibility=Visibility.Hidden;
    }

在您的其他窗口构造函数中应该是这样的

    Mediator _Mediator;
    public MainWindow1(Mediator _mediator)
    {
        InitializeComponent();
        _Mediator=_mediator;

    }
    //ON button click u notify like this
     private void button_click(object sender, RoutedEventArgs e)
    {

        _Mediator.Notify("ButtonVisibility",null)
    }

当您从主窗口初始化子窗口时

MainWindow1 window1= new MainWindow(_Mediator);

注意：在 MVVM 模式中使用了 Mediator 类，但它可以在这种情况下提供帮助。