问题描述

我正在尝试使用名为 EditColorDialog 的对话框更改 MainWindow 的背景颜色.该对话框可以很好地读取主窗口的当前背景颜色，但我似乎无法让它更改该颜色.

I am trying to change the background color of the MainWindow using a dialogbox called EditColorDialog. The dialogbox can read the current background color of the main window just fine but I can't seem to get it to change that color.

public partial class EditColorDialog : Window
{
    ColorDialog colorPicker = new ColorDialog();  //this is a colorpicker
    MainWindow mw = new MainWindow();

    public ColorDialog()
    {
        InitializeComponent();
        rect.Fill = mw.background;  //reads the color off the main window
    }

    private void rect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        colorPicker.Owner = this;
        if ((bool)colorPicker.ShowDialog())
        {
            //selects new color from colorpicker
            rect.Fill = new SolidColorBrush(colorPicker.SelectedColor);
        }
    }

    private void OkButton_Click(object sender, RoutedEventArgs e)
    {
        mw.background = rect.Fill;
        this.Close(); 
    }
}

我在主窗口代码中使用这个属性

I am using this property in the main window code

public Brush background
{
    get { return main_window.Background; }
    set { main_window.Background = value; }   
}

推荐答案

每次创建这样的对话框时都会创建一个新的 MainWindow.不是个好主意.

You create a new MainWindow every time you create such a dialog. Not a good idea.

如果有什么你应该设置 Application.MainWindow 在应用程序启动时.然后像这样设置引用:

If anything you should set the Application.MainWindow on application startup. Then set the reference like this:

MainWindow mw = (MainWindow)Application.Current.MainWindow;

只需使用 nw.Background，您的该属性似乎是静态调用的非静态包装器.这样做你已经有了主窗口.

and just use nw.Background, that property of yours seems like a non-static wrapper for a static call. Doing it this way you already have the main window.

这篇关于更改 MainWindow 背景颜色 WPF的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！