IDialogAware 对话框

<Grid Background="White">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
        </Grid.RowDefinitions>
        <TextBlock DockPanel.Dock="Top" Text="编辑窗口" FontSize="50"/>
        <TextBox Grid.Row="1" Height="30" Text="{Binding Title}"/>
        <StackPanel Grid.Row="2" HorizontalAlignment="Right" Orientation="Horizontal"  >
            <Button Command="{Binding SaveCommand}" Content="确定" Height="30" Width="80"/>
            <Button Command="{Binding CancelCommand}" Margin="10" Content="取消" Height="30" Width="80"/>
        </StackPanel>
    </Grid>

using Prism.Commands;
using Prism.Mvvm;
using Prism.Services.Dialogs;
using System;
 
namespace PrismWpfBlankApp.ViewModels
{
    public class MsgViewModel : BindableBase, IDialogAware
    {//IDialogAware 对话框接口
        public MsgViewModel()
        {
            SaveCommand = new DelegateCommand(Save);
            CancelCommand = new DelegateCommand(Cancel);
        }
        private string title;
        public string Title
        {
            get { return title; }
            set { SetProperty(ref title, value); }
        }
        public DelegateCommand SaveCommand { get; }
        public DelegateCommand CancelCommand { get; }
        private void Save()
        {
            //当关闭对话框时，回传参数
            DialogParameters param = new DialogParameters();
            param.Add("Value", Title);
            RequestClose?.Invoke(new DialogResult(ButtonResult.OK, param));
        }
        private void Cancel()
        {
            RequestClose?.Invoke(new DialogResult(ButtonResult.No));
        }
        #region 接口
        public event Action<IDialogResult> RequestClose;
 
        public bool CanCloseDialog()
        {//是否允许关闭窗口
            return true;
        }
 
        public void OnDialogClosed()
        {//窗口关闭之后的处理业务
 
        }
 
        public void OnDialogOpened(IDialogParameters parameters)
        {//打开窗口之前
            Title = parameters.GetValue<string>("Value");//获取传入的参数
        }
        #endregion 
    }
}

protected override void RegisterTypes(IContainerRegistry containerRegistry)
      {
        
          //注册对话框视图
          containerRegistry.RegisterDialog<MsgView, MsgViewModel>();
      }

public class MainWindowViewModel : BindableBase
   {
      private readonly IDialogService m_DialogService;
    
       private string _title = "Prism Application";
       public string Title
       {
           get { return _title; }
           set { SetProperty(ref _title, value); }
       }
 
       public MainWindowViewModel(IDialogService dialogService)
       {
           OpenACommand = new DelegateCommand(OpenA);
           m_DialogService = dialogService;
       }
      
       public DelegateCommand OpenACommand { get; }
   
       private void OpenA()
       {
           DialogParameters param=new DialogParameters();
           param.Add("Value", "传入的参数");
           m_DialogService.ShowDialog(nameof(MsgView), param, result =>
           {
               if(result.Result== ButtonResult.OK)
               {
                   //得到返回参数的结果
                   Title = result.Parameters.GetValue<string>("Value");
 
               }
           });
       }
       
      
   }