楷模

public class News
{
 
    public News()
    {
        this.Created = DateTime.Now;
    }
 
    public int Id { get; set; }       
    public string Title { get; set; }
    public string Preamble { get; set; }
    public string Body { get; set; }
    public DateTime Created { get; set; }
 
    public int UserId { get; set; }
 
    public virtual User User { get; set; }
 
    public int CategoryId { get; set; }
    public int ImageId { get; set; }
 
    public virtual Image Image { get; set; }
    public virtual Category Category { get; set; }
}
 
public class Image
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string ImageUrl { get; set; }
    public Byte[] ImageData { get; set; }
    public string ImageMimeType { get; set; }
}
 
public class Category
{
    public int Id { get; set; }
    public string Name { get; set; }
}

….以下模型(这些模型连接到EfDbContext)连接到以下存储库…

接口/库

public class NewsRepository : INewsRepository
{
    EfDbContext context = new EfDbContext();
 
    public IQueryable<News> All
    {
        get { return context.News; }
    }
 
    public IQueryable<News> AllIncluding(params Expression<Func<News,object>>[] includeProperties)
    {
        IQueryable<News> query = context.News;
        foreach (var includeProperty in includeProperties) {
            query = query.Include(includeProperty);
        }
        return query;
    }
 
    public News Find(int id)
    {
        return context.News.Find(id);
    }
 
    public void InsertOrUpdate(News news)
    {
        if (news.Id == default(int)) {
            // New entity
            context.News.Add(news);
        } else {
            // Existing entity
            context.Entry(news).State = EntityState.Modified;
        }
    }
 
    public void Delete(int id)
    {
        var news = context.News.Find(id);
        context.News.Remove(news);
    }
 
    public void Save()
    {
        context.SaveChanges();
    }
}
 
public interface INewsRepository
{
    IQueryable<News> All { get; }
    IQueryable<News> AllIncluding(params Expression<Func<News,object>>[] includeProperties);
    News Find(int id);
    void InsertOrUpdate(News news);
    void Delete(int id);
    void Save();
}

在我的HomeController()中,我得到了一个JsonResult metod,我想返回上下文.
这是方法

Json请求

[HttpGet]
    public JsonResult GetNews()
    {
        var p = newsRepository.AllIncluding(news => news.Category,news => news.Image);
        return Json(p,JsonRequestBehavior.AllowGet);
    }

我收到以下错误：

序列化“System.Data.Entity.DynamicProxies.News_96C0B16EC4AC46070505EEC7537EF3C68EE6CE5FC3C7D8EBB793B2CF9BD391B3”类型的对象时检测到循环引用.

我猜这与懒加载的东西有关(Iam目前正在学习C#)我发现这篇文章关于这个……

http://hellowebapps.com/2010-09-26/producing-json-from-entity-framework-4-0-generated-classes/

但我没有得到它的工作…我能读到的关于代码的是他们试图深入搜索通过对象…更多我无法弄清楚.

我的问题是如何传递lazyLoading对象？进入json / serializer
或者它不存在,任何关于我如何进行的想法？