CODEWITHSUNDEEP
jsonserializationf#json.net
WhiteBoard
WhiteBoard

Reputation: 61

Serialization of F# mutable variable to JSON using Json.NET generates duplicated items

Here is my code:

 open Newtonsoft.Json
 open Newtonsoft.Json.Converters

 type T = {
     mutable name : string;
     mutable height : int;
     }

 let a = { name = "abc"; height = 180;}
 a.height  <- 200
 let b = JsonConvert.SerializeObject(a, Formatting.Indented)
 printfn "%s"  b

The output of the code is:

{
  "name@": "abc",
  "height@": 200,
  "name": "abc",
  "height": 200
}

How can I avoid the outputs with '@' in the properity?

Upvotes: 6

Views: 721

Answers (4)

Ebi Igweze
Ebi Igweze

Reputation: 460

I had the same issue and I had to look eventually this was what worked, after so much digging through Json.Net docs.

 open System
 open System.Runtime.Serialization

 [<CLIMutable>]
 [<DataContract>]
 type T = {
    [<DataMember>] mutable name : string;
    [<DataMember>] mutable height : int }

Upvotes: 1

Daniel
Daniel

Reputation: 47904

Try this:

[<CLIMutable>]
[<JsonObject(MemberSerialization=MemberSerialization.OptOut)>]
type T = {
    name : string;
    height : int;
    }

MemberSerialization.OptOut causes only public members to be serialized (skipping private fields which are an implementation detail of records). The CLIMutable attribute is intended specifically for serialization and saves from having to prefix each member with mutable.

Upvotes: 3

Konrad Kokosa
Konrad Kokosa

Reputation: 16878

With the help of DataMemberAttribute you can specify names of the serialized members: 

type T = {
    [<field: DataMember(Name="name")>]
    mutable name : string;
    [<field: DataMember(Name="height")>]
    mutable height : int;
}

Upvotes: 2

FremyCompany
FremyCompany

Reputation: 2840

Did you try to add attributes [<...>] in front of the property? Because that attribute will only apply to the property, not to the generated backend. Not sure which attribute JSON.NET reacts to, however.

Upvotes: 1

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