而序列化类型的对象时检测到循环引用 - 实体JSON错误 [英] Entity to json error - A circular reference was detected while serializing an object of type

问题描述

继试图实体对象转换成JSON字符串时发生错误。我使用C＃MVC4与code首先DB设计。它接缝，因为其表之间FKS和关系创建这个问题。会有什么解决办法？

在序列化类型System.Data.Entity.DynamicProxies.User的对象时检测到循环引用

我的code是

 用户MA = db.user.First（X =＆GT; x.u_id == ID）;
  返回JSON（MA，JsonRequestBehavior.AllowGet）;
 

解决方案

它，因为它试图加载子对象，它可以创造一些圆环，将永远不会结束的（A => B，B => C，C => D，D => A）

您可以关闭它仅适用于特定的时刻，following.So的DbContext将不会加载客户子对象，除非包含方法被调用的对象上。

  db.Configuration.ProxyCreationEnabled = FALSE;
  用户MA = db.user.First（X =＆GT; x.u_id == ID）;
  返回JSON（MA，JsonRequestBehavior.AllowGet）;
 

Following error occurred when trying to convert entity object into JSON String. I'm using C# MVC4 with code first DB designing. It seams its because FKs and relationships between tables create this issue. What will be the workaround ?

A circular reference was detected while serializing an object of type System.Data.Entity.DynamicProxies.User

my code is

  User ma = db.user.First(x => x.u_id == id);
  return Json(ma, JsonRequestBehavior.AllowGet);

解决方案

Its because it is trying to load child objects and it may be creating some circular loop that will never ending( a=>b, b=>c, c=>d, d=>a)

you can turn it off only for that particular moment as following.So dbcontext will not load customers child objects unless Include method is called on your object

  db.Configuration.ProxyCreationEnabled = false;
  User ma = db.user.First(x => x.u_id == id);
  return Json(ma, JsonRequestBehavior.AllowGet);

这篇关于而序列化类型的对象时检测到循环引用 - 实体JSON错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！