而串行化類型JSON的目的MVC

Question

我遵循這個視頻Youtube

的指令。在我的控制器中檢測到循環引用：

public ActionResult loaddatacate() 
     { 
      BBDbModel context = new BBDbModel(); 
      context.Configuration.ProxyCreationEnabled = false; 
      var data = context.Drinks_Category.ToList(); 
      return Json(new { data = data }, JsonRequestBehavior.AllowGet); 
     } 

筆者認爲：

<script type="text/javascript"> 
     $(document).ready(function (e) { 
      $("#example1").DataTable({ 
       "ajax": { 
        "url": "/Admin/AdminHome/loaddatacate", 
        "type": "GET", 
        "datatype": "json" 
       }, 
       "columns": [ 
        { "data": "Id_category", "autowidth": true }, 
        { "data": "Name_category", "autowidth": true }, 
        { "data": "Parent", "autowidth": true } 
       ] 
      }); 
      var Parent = @Html.Raw(Json.Encode(ViewBag.Parent)); 
      $(".parent").autocomplete({ 
       source: Parent 
      }); 
     }); 

數據庫中的表「Drinks_category」有3列：Id_category，Name_category，Parent

錯誤是：

在序列化「WebApplication3.Models.Framework.Drinks_Category」類型的對象時檢測到循環引用。

Drinks_Category類：

public partial class Drinks_Category 
    { 
     [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")] 
     public Drinks_Category() 
     { 
      Drinks = new HashSet<Drink>(); 
      Drinks_Category1 = new HashSet<Drinks_Category>(); 
     } 

     [Key] 
     [StringLength(10)] 
     public string Id_category { get; set; } 

     [StringLength(20)] 
     public string Name_category { get; set; } 

     [Required] 
     [StringLength(10)] 
     public string Parent { get; set; } 

     [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")] 
     public virtual ICollection<Drink> Drinks { get; set; } 

     [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")] 
     public virtual ICollection<Drinks_Category> Drinks_Category1 { get; set; } 

     public virtual Drinks_Category Drinks_Category2 { get; set; } 
    } 

請幫助我。謝謝！

Answer 1

據我所知，當你嘗試序列化一個類時，這種類型的錯誤可能會上升，例如class1，該屬性通過屬性引用另一個類表示class2，並依次引用具有屬性class1的class2。循環引用是因爲從class1的你去的Class2和等級2到Class

Answer 2

指導串行忽視，如循環參考：

var data = JsonConvert.SerializeObject(myList, new JsonSerializerSettings { ReferenceLoopHandling = ReferenceLoopHandling.Ignore}); 

並返回它想：

return Json(new { data = data }, JsonRequestBehavior.AllowGet);