WinUI 3 从导航视图中的设置页面修改应用程序的主窗口标题

Question

我有一个在 Windows 10 上运行的 winui 3 桌面应用程序。在导航视图的设置页面中，我想允许用户更改环境并在主窗口的标题中指示环境。

在主窗口的代码中，我最初设置了标题：

namespace MetricReporting
{
    /// <summary>
    /// An empty window that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainWindow : Window
    {
        public MainWindow()
        {
            this.InitializeComponent();
            this.Title = $"EMB Metric Reporting Tool {getSelectedEnvironment()}";
            MasterContentFrame.Navigate(typeof(pageHome));
            MasterNavigation.Header = "Home";
            // Retrieve the window handle (HWND) of the current WinUI 3 window.
            var hWnd = WinRT.Interop.WindowNative.GetWindowHandle(this);
            // For EPPlus spreadsheet library for .NET         
            ExcelPackage.LicenseContext = OfficeOpenXml.LicenseContext.NonCommercial;
        }

        private string getSelectedEnvironment()
        {
            return " (Non-Production)";
        }

在“设置”页面上的按钮单击方法中，我不知道如何引用主窗口的标题：

private void envProd_Click(object sender, RoutedEventArgs e)
{
    DisplayEnvProddDialog();
    MainWindow.Title = $"EMB Metric Reporting Tool  (Production)";
}

上面的代码有语法错误 cs0120：非静态字段、方法或属性“Window.Title”需要对象引用

请帮忙。
谢谢你。

Answer 1

在 MainWindow 类中添加一个方法来更新标题

public void UpdateTitle(string environment)
    {
        this.Title = $"EMB Metric Reporting Tool {environment}";
    }

然后在您的设置页面中添加对主窗口的引用：

private MainWindow mainWindow;

public SettingsPage(MainWindow mainWindow)
{
    this.mainWindow = mainWindow;
    this.InitializeComponent();
}

然后修改按钮单击事件处理程序：

private void envProd_Click(object sender, RoutedEventArgs e)
{
    DisplayEnvProdDialog();
    mainWindow.UpdateTitle(" (Production)");
}

然后您可以从主窗口导航到您的设置页面，传递此引用：

MasterContentFrame.Navigate(typeof(SettingsPage), this);