如何在orchad core中获取特定内容类型的所有内容项

using Microsoft.AspNetCore.Mvc;
using OrchardCore.ContentManagement;
using OrchardCore.ContentManagement.Display;
using OrchardCore.Contents;
using System.Collections.Generic;
using System.Linq;

public class ContentItemsController : Controller
{
    private readonly IContentManager _contentManager;
    private readonly IContentDisplayManager _contentDisplayManager;

    public ContentItemsController(IContentManager contentManager, IContentDisplayManager contentDisplayManager)
    {
        _contentManager = contentManager;
        _contentDisplayManager = contentDisplayManager;
    }

    public IActionResult GetContentItems(string contentType)
    {
        var query = _contentManager.Query<ContentItem, ContentItemIndex>(contentType);
        var contentItems = query.List().ToList();

        var result = new List<dynamic>();
        foreach (var contentItem in contentItems)
        {
            var shape = _contentDisplayManager.BuildDisplay(contentItem, "Summary");
            result.Add(shape);
        }

        return Json(result);
    }
}