C#WPF界面MVVM框架下异步命令的启动和停止及绑定

框架采用CommunityToolkit.Mvvm，界面如下

 View的XAML代码

ViewModel如下

// Ignore Spelling: App

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;

using System;
using System.Threading;
using System.Threading.Tasks;

namespace WpfApp6
{

    public class MainWinViewModel : ObservableRecipient, IRecipient
    {
        public MainWinViewModel()
        {
            this.IsActive = true; 
            ExecCommand = new AsyncRelayCommand(ExecAsync);
            CancleExecCommand = new RelayCommand(ExecCommand.Cancel);
        }
        public void Receive(MyMessage message)
        {
            myMessage.Message = $"Num={message.Id},Str={message.Message}";
        }
        public MyMessage myMessage { get; set; }=new MyMessage() { Id =1, Message="原始信息"};
        public AsyncRelayCommand ExecCommand { get; }
        private  async Task ExecAsync( CancellationToken cancellationToken)
        {
            while (true)
            {
                if (cancellationToken.IsCancellationRequested)
                    return;
                await Task.Delay(1);
                WeakReferenceMessenger.Default.Send(new MyMessage { Id = 123, Message = DateTime.Now.ToString() });
            } 
        }
        public RelayCommand CancleExecCommand { get; set; }

    }
}

Model如下：

using CommunityToolkit.Mvvm.ComponentModel;

namespace WpfApp6
{
    public partial class MyMessage : ObservableObject
    {
        [ObservableProperty]
        private int? id;
        [ObservableProperty]
        private string? message;  
    }
}

ViewModel和View的连接：

 public partial class MainWindow : Window
 {
     public MainWindow()
     {
         InitializeComponent();
         DataContext = new MainWinViewModel();//建立viewmodel和view的联系
     }
 }