Prism使用消息总线打开窗体的案例（中介者模式）

shi57832025-05-22 9:48

弹窗事件定义：

cs 复制代码

using Prism.Events;

public class ShowPopupEvent : PubSubEvent<string> { }

弹窗管理类（中介）：

cs 复制代码

using Prism.Events;
using Prism.Services.Dialogs;

public class PopupManager
{
    private readonly IEventAggregator _eventAggregator;
    private readonly IDialogService _dialogService;

    public PopupManager(IEventAggregator eventAggregator, 
                      IDialogService dialogService)
    {
        _eventAggregator = eventAggregator;
        _dialogService = dialogService;
        _eventAggregator.GetEvent<ShowPopupEvent>()
                      .Subscribe(ShowDialog);
    }

    private void ShowDialog(string dialogName)
    {
        _dialogService.ShowDialog(dialogName, null, result => {});
    }
}

启动和IOC注入：

cs 复制代码

 Prism.Ioc;
using Prism.Modularity;
using Prism.Unity;

public class Bootstrapper : PrismBootstrapper
{
    protected override void RegisterTypes(IContainerRegistry containerRegistry)
    {
        containerRegistry.RegisterDialog<LoginDialog>("LoginDialog");
        containerRegistry.RegisterDialog<SettingsDialog>("SettingsDialog");
        containerRegistry.RegisterSingleton<PopupManager>();
        containerRegistry.RegisterSingleton<IEventAggregator, EventAggregator>();
    }
}

发布消息：

cs 复制代码

using Prism.Commands;
using Prism.Events;

public class MainViewModel
{
    private readonly IEventAggregator _eventAggregator;
    
    public DelegateCommand ShowLoginCommand { get; }
    public DelegateCommand ShowSettingsCommand { get; }

    public MainViewModel(IEventAggregator eventAggregator)
    {
        _eventAggregator = eventAggregator;
        ShowLoginCommand = new DelegateCommand(() => 
            _eventAggregator.GetEvent<ShowPopupEvent>().Publish("LoginDialog"));
        ShowSettingsCommand = new DelegateCommand(() =>
            _eventAggregator.GetEvent<ShowPopupEvent>().Publish("SettingsDialog"));
    }
}