Sebastien Lachance

Learning new things everyday

A Circular Reference Was Detected While Serializing an Object to Type Code.Models.Category

I have an NHibernate class with the following properties :

public class Category
{
    public virtual int Id { get; set; }
    public virtual string Name { get;set; }
    public virtual Category Parent { get;set; }
    public virtual IList<Category> Childs { get;set; }
}

And an action that return a list of categories as JSON :

public JsonResult Categories 
{
    return Json(GetCategories(), JsonRequestBehavior.AllowGet);
}

I know that it’s not pefect to use an NHibernate class instead of a view model, but it’s a very very small application and I’m trying to keep things clean.

Solution : 

return Json(GetCategories().Select(c => new { c.Id, c.Name }), JsonRequestBehavior.AllowGet);

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