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添加包：

App.xaml：

<prism:PrismApplication x:Class="WpfApp2.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfApp2"
             xmlns:prism="http://prismlibrary.com/" 
             >
    <Application.Resources>
         
    </Application.Resources>
</prism:PrismApplication>
 

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

namespace WpfApp2
{
    /// <summary>
    /// App.xaml 的交互逻辑
    /// </summary>
    public partial class App :PrismApplication
    {
        protected override Window CreateShell()
        {
            return Container.Resolve<MainWindow>();// 返回主窗口
        }
        protected override void RegisterTypes(IContainerRegistry registry)
        {
            // 注册服务
        }
    }
}

 class MainWindowViewMode :BindableBase
    {
        public MainWindowViewMode()
        {

        }

   }