Prism Demo系列(二十五) Prism架构剖析：25-NotificationRequest

一、简介

到了这篇博客，导航的内容章节已经结束讨论。本文学习Notification，即实现事件通知，比如弹出一个窗口。

工程目录（就几个文件而已）：

参考：

https://www.bbsmax.com/A/A2dmReOBze/

https://blog.csdn.net/wangshubo1989/article/details/47998611

二、举例

Bootstrapper.cs：

using Microsoft.Practices.Unity;
using Prism.Unity;
using UsingPopupWindowAction.Views;
using System.Windows;

namespace UsingPopupWindowAction
{
    class Bootstrapper : UnityBootstrapper
    {
        protected override DependencyObject CreateShell()
        {
            return Container.Resolve<MainWindow>();
        }

        protected override void InitializeShell()
        {
            Application.Current.MainWindow.Show();
        }
    }
}

App.xaml：

<Application x:Class="UsingPopupWindowAction.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:UsingPopupWindowAction">
    <Application.Resources>
         
    </Application.Resources>
</Application>

App.xaml.cs:

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;

namespace UsingPopupWindowAction
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);

            var bootstrapper = new Bootstrapper();
            bootstrapper.Run();
        }
    }
}

MainWindow.xaml(MainWindow.xaml.cs为空)： 

<Window x:Class="UsingPopupWindowAction.Views.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
        xmlns:prism="http://prismlibrary.com/"
        prism:ViewModelLocator.AutoWireViewModel="True"
        Title="{Binding Title}" Height="350" Width="525">
    <i:Interaction.Triggers>
        <prism:InteractionRequestTrigger SourceObject="{Binding NotificationRequest}">
            <prism:PopupWindowAction IsModal="True" CenterOverAssociatedObject="True" />
        </prism:InteractionRequestTrigger>
    </i:Interaction.Triggers>
    
    <StackPanel>
        <Button Margin="5" Content="Raise Default Notification" Command="{Binding NotificationCommand}" />

        <TextBlock Text="{Binding Title}" Margin="25" HorizontalAlignment="Center" FontSize="24" />
    </StackPanel>
</Window>

 MainWindowViewModel.cs:

using Prism.Commands;
using Prism.Interactivity.InteractionRequest;
using Prism.Mvvm;

namespace UsingPopupWindowAction.ViewModels
{
    public class MainWindowViewModel : BindableBase
    {
        private string _title = "Prism Unity Application";
        public string Title
        {
            get { return _title; }
            set { SetProperty(ref _title, value); }
        }

        public InteractionRequest<INotification> NotificationRequest { get; set; }
        public DelegateCommand NotificationCommand { get; set; }

        public MainWindowViewModel()
        {
            NotificationRequest = new InteractionRequest<INotification>();
            NotificationCommand = new DelegateCommand(RaiseNotification);
        }

        void RaiseNotification()
        {
            NotificationRequest.Raise(new Notification { Content = "Notification Message", Title = "Notification" }, r => Title = "Notified");
        }
    }
}

运行效果： 

点击后：