改变MainWindow背景颜色WPF

问题描述

我正在使用一个名为EditColorDialog的对话框来更改MainWindow的背景颜色。对话框可以读取主窗口的当前背景颜色，但我似乎无法让它更改颜色。

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此属性

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

您创建一个新的MainWindow每次你创建这样一个对话。不是一个好主意。

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

如果有任何您应该设置。然后设置这样的引用：

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 你的属性似乎是静态调用的非静态包装器。这样做你已经有主窗口。

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.

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