donet/Wpf/Prism1/ModuleA/ViewModels/CViewModel.cs

using System;
using System.Windows;
using ModuleA.Event;
using Prism.Commands;
using Prism.Events;
using Prism.Services.Dialogs;

namespace ModuleA.ViewModels;

public class CViewModel : IDialogAware
{
    public DelegateCommand ConfirmCommand { get; set; }
    public DelegateCommand CancelCommand { get; set; }

    public CViewModel(IEventAggregator aggregator)
    {
        ConfirmCommand = new DelegateCommand(Confirm);
        CancelCommand = new DelegateCommand(Cancel);
        // 通过事件聚合器发布消息
        var messageEvent = aggregator.GetEvent<MessageEvent>();
        messageEvent.Publish("Hello World");
    }

    private void Cancel()
    {
        DialogParameters info = new DialogParameters();
        info.Add("address", "Beijing");
        RequestClose?.Invoke(new DialogResult(ButtonResult.No, info));
    }

    private void Confirm()
    {
        DialogParameters info = new DialogParameters();
        info.Add("title", "标题");

        RequestClose?.Invoke(new DialogResult(ButtonResult.OK, info));
    }

    /// <summary>
    ///     能否展示
    /// </summary>
    /// <returns></returns>
    public bool CanCloseDialog()
    {
        return true;
    }

    /// <summary>
    ///     窗口关闭【这个函数是在 CanCloseDialog 触发后调用，此时 RequestClose 一直为 null】
    /// </summary>
    public void OnDialogClosed()
    {

    }

    public void OnDialogOpened(IDialogParameters parameters)
    {
        parameters.TryGetValue("age", out int age);
        Console.WriteLine(age);
    }

    public string Title { get; }
    public event Action<IDialogResult>? RequestClose;
}