JSON Net Self referencing loop detected

Question

I have a mssql database for my website within 4 tables   When I use this   public static string GetAllEventsForJSON         using  CyberDBDataContext db   new CyberDBDataContext                  return JsonConvert SerializeObject  from a in db Events where a Active select a  ToList    new JavaScriptDateTimeConverter               The code results in the following error      Newtonsoft Json JsonSerializationException  Self referencing loop detected for property  CyberUser  with type  DAL CyberUser     Path   0  EventRegistrations 0  CyberUser UserLogs 0

User · Answer

JsonConvert SerializeObject ObjectName  new JsonSerializerSettings                PreserveReferencesHandling   PreserveReferencesHandling Objects              Formatting   Formatting Indented

User · Answer

Add   JsonIgnore   to your model class       public Customer           Orders   new Collection lt Order gt          public int Id   get  set    public string Name   get  set    public string Surname   get  set      JsonIgnore  public ICollection lt Order gt  Orders   get  set

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I am using Dot Net Core 3 1 and did an search for           Newtonsoft Json JsonSerializationException  Self referencing loop detected for property        I am adding this to this question  as it will be an easy reference   You should use the following in the Startup cs file    services AddControllers                    AddNewtonsoftJson options   gt                                           Use the default property  Pascal  casing                     options SerializerSettings ContractResolver   new CamelCasePropertyNamesContractResolver                        options SerializerSettings ReferenceLoopHandling   ReferenceLoopHandling Ignore

User · Answer

This may help you   public MyContext     base  name MyContext           Database SetInitializer new MyContextDataInitializer          this Configuration LazyLoadingEnabled   false       this Configuration ProxyCreationEnabled   false        http   code msdn microsoft com Loop-Reference-handling-in-caaffaf7

User · Answer

If using ASP NET Core MVC  add this to the ConfigureServices method of your startup cs file   services AddMvc        AddJsonOptions          options   gt  options SerializerSettings ReferenceLoopHandling                       Newtonsoft Json ReferenceLoopHandling Ignore

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Sometimes you have loops becouse your type class have references to other classes and that classes have references to your type class  thus you have to select the parameters that you need exactly in the json string  like this code   List lt ROficina gt  oficinas   new List lt ROficina gt     oficinas     list content    var x   JsonConvert SerializeObject oficinas Select o   gt  new                               o IdOficina                  o Nombre

User · Answer

I just had the same problem with Parent Child collections and found that post which has solved my case   I Only wanted to show the List of parent collection items and didn t need any of the child data  therefore i used the following and it worked fine   JsonConvert SerializeObject ResultGroups  Formatting None                          new JsonSerializerSettings                                                          ReferenceLoopHandling   ReferenceLoopHandling Ignore                               JSON NET Error Self referencing loop detected for type  it also referes to the Json NET codeplex page at    http   json codeplex com discussions 272371  Documentation  ReferenceLoopHandling setting

User · Answer

You must set Preserving Object References   var jsonSerializerSettings   new JsonSerializerSettings       PreserveReferencesHandling   PreserveReferencesHandling Objects      Then call your query var q    from a in db Events where a Active select a  ToList    like      string jsonStr   Newtonsoft Json JsonConvert SerializeObject q  jsonSerializerSettings     See  https   www newtonsoft com json help html PreserveObjectReferences htm

User · Answer

for asp net core 3 1 3 this worked for me services AddControllers   AddNewtonsoftJson opt  gt               opt SerializerSettings ReferenceLoopHandling   Newtonsoft Json ReferenceLoopHandling Ignore

User · Answer

The JsonSerializer instance can be configured to ignore reference loops  Like in the following  this function allows to save a file with the content of the json serialized object      public static void SaveJson lt T gt  this T obj  string FileName                   JsonSerializer serializer   new JsonSerializer            serializer ReferenceLoopHandling   ReferenceLoopHandling Ignore          using  StreamWriter sw   new StreamWriter FileName                         using  JsonWriter writer   new JsonTextWriter sw                                 writer Formatting   Formatting Indented                  serializer Serialize writer  obj

User · Answer

The fix is to ignore loop references and not to serialize them  This behaviour is specified in JsonSerializerSettings   Single JsonConvert with an overload   JsonConvert SerializeObject  from a in db Events where a Active select a  ToList    Formatting Indented      new JsonSerializerSettings             ReferenceLoopHandling   Newtonsoft Json ReferenceLoopHandling Ignore            If you d like to make this the default behaviour  add a  Global Setting with code in Application Start   in Global asax cs   JsonConvert DefaultSettings        gt  new JsonSerializerSettings        Formatting   Newtonsoft Json Formatting Indented       ReferenceLoopHandling   Newtonsoft Json ReferenceLoopHandling Ignore      Reference  https   github com JamesNK Newtonsoft Json issues 78

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