如何在Visual Studio2019中异步加载ModelingPackage (DSL-Tools)？

using System;
using System.ComponentModel.Design;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.VisualStudio.Shell;
using Microsoft.VisualStudio.Shell.Interop;
using Microsoft.VisualStudio.Modeling.Shell;

namespace MyExtension
{
    [PackageRegistration(UseManagedResourcesOnly = true, AllowsBackgroundLoading = true)]
    [Guid("Your-Package-GUID")]
    [ProvideMenuResource("Menus.ctmenu", 1)]
    [ProvideAutoLoad(UIContextGuids.NoSolution, PackageAutoLoadFlags.BackgroundLoad)]
    public sealed class MyPackage : AsyncPackage
    {
        protected override async Task InitializeAsync(CancellationToken cancellationToken, IProgress<ServiceProgressData> progress)
        {
            await base.InitializeAsync(cancellationToken, progress);

            await JoinableTaskFactory.RunAsync(async () =>
            {
                await Task.Delay(1000); // Simulate some async operation

                // Get ModelingPackage
                ModelingPackage modelingPackage = await GetServiceAsync(typeof(ModelingPackage)) as ModelingPackage;
                if (modelingPackage != null)
                {
                    // Perform operations with ModelingPackage
                    // e.g., Load model, process model data, etc.
                }
            });
        }
    }
}