Prism/e2e/Wpf/HelloWorld/ViewModels/MainWindowViewModel.cs

using System;
using HelloWorld.Core;
using Prism.Commands;
using Prism.Mvvm;
using Prism.Navigation.Regions;
using Prism.Dialogs;

namespace HelloWorld.ViewModels
{
    public class MainWindowViewModel : BindableBase
    {
        private string _title = "Prism Application";
        private readonly IDialogService _dialogService;
        private readonly IRegionManager _regionManager;

        public string Title
        {
            get { return _title; }
            set { SetProperty(ref _title, value); }
        }

        public DelegateCommand ShowDialogCommand { get; private set; }

        private DelegateCommand<string> _navigate;
        public DelegateCommand<string> NavigateCommand =>
            _navigate ?? (_navigate = new DelegateCommand<string>(ExecuteNavigateCommand));

        void ExecuteNavigateCommand(string parameter)
        {
            if (!string.IsNullOrWhiteSpace(parameter))
                _regionManager.RequestNavigate("ContentRegion", parameter);
        }

        public MainWindowViewModel(IDialogService dialogService, IRegionManager regionManager)
        {
            _dialogService = dialogService;
            _regionManager = regionManager;
            ShowDialogCommand = new DelegateCommand(ShowDialog);
        }

        private void ShowDialog()
        {
            var message = "This is a message that should be shown in the dialog.";

            //using the dialog service as-is
            //_dialogService.Show("NotificationDialog", new DialogParameters($"message={message}"), r =>
            //{
            //    if (r.Result == ButtonResult.None)
            //        Title = "Result is None";
            //    else if (r.Result == ButtonResult.OK)
            //        Title = "Result is OK";
            //    else if (r.Result == ButtonResult.Cancel)
            //        Title = "Result is Cancel";
            //    else
            //        Title = "I Don't know what you did!?";
            //});

            //using custom extenions methods to simplify the app's dialogs
            //_dialogService.ShowNotification(message, r =>
            //{
            //    if (r.Result == ButtonResult.None)
            //        Title = "Result is None";
            //    else if (r.Result == ButtonResult.OK)
            //        Title = "Result is OK";
            //    else if (r.Result == ButtonResult.Cancel)
            //        Title = "Result is Cancel";
            //    else
            //        Title = "I Don't know what you did!?";
            //});

            //_dialogService.ShowConfirmation(message, r =>
            //{
            //    if (r.Result == ButtonResult.None)
            //        Title = "Result is None";
            //    else if (r.Result == ButtonResult.OK)
            //        Title = "Result is OK";
            //    else if (r.Result == ButtonResult.Cancel)
            //        Title = "Result is Cancel";
            //    else
            //        Title = "I Don't know what you did!?";
            //});

            _dialogService.ShowNotificationInAnotherWindow(message, r =>
            {
                if (r.Result == ButtonResult.None)
                    Title = "Result is None";
                else if (r.Result == ButtonResult.OK)
                    Title = "Result is OK";
                else if (r.Result == ButtonResult.Cancel)
                    Title = "Result is Cancel";
                else
                    Title = "I Don't know what you did!?";
            });
        }
    }


}