modernkeepass/WinAppCommon/Actions/NavigateToUrlAction.cs

using System;
using Windows.UI.Xaml;
using GalaSoft.MvvmLight.Views;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Xaml.Interactivity;

namespace ModernKeePass.Actions
{
    public class NavigateToUrlAction : DependencyObject, IAction
    {
        public string Url
        {
            get { return (string)GetValue(UrlProperty); }
            set { SetValue(UrlProperty, value); }
        }

        public static readonly DependencyProperty UrlProperty =
            DependencyProperty.Register("Url", typeof(string), typeof(NavigateToUrlAction), new PropertyMetadata(string.Empty));

        public object Execute(object sender, object parameter)
        {
            try
            {
                var uri = new Uri(Url);
                return Windows.System.Launcher.LaunchUriAsync(uri).GetAwaiter().GetResult();
            }
            catch (Exception ex)
            {
                var dialogService = App.Services.GetRequiredService<IDialogService>();
                dialogService.ShowError(ex, ex.Message, null, () => {}).Wait();
                return false;
            }
        }
    }
}