Convert an object to json, and json to object

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#r "System.Runtime.Serialization" // for interactive
// Reference to assembly System.Runtime.Serialization and System.Xml

open System.IO
open System.Runtime.Serialization.Json
open System.Xml
open System.Text

/// Object to Json 
let internal json<'t> (myObj:'t) =   
        use ms = new MemoryStream() 
        (new DataContractJsonSerializer(typeof<'t>)).WriteObject(ms, myObj) 
        Encoding.Default.GetString(ms.ToArray()) 


/// Object from Json 
let internal unjson<'t> (jsonString:string)  : 't =  
        use ms = new MemoryStream(ASCIIEncoding.Default.GetBytes(jsonString)) 
        let obj = (new DataContractJsonSerializer(typeof<'t>)).ReadObject(ms) 
        obj :?> 't

namespace System

namespace System.IO

namespace System.Runtime

namespace System.Runtime.Serialization

namespace System.Runtime.Serialization.Json

namespace System.Xml

namespace System.Text

val internal json : myObj:'t -> string


 Object to Json

val myObj : 't

val ms : MemoryStream

Multiple items
type MemoryStream =
  inherit Stream
  new : unit -> MemoryStream + 6 overloads
  member CanRead : bool
  member CanSeek : bool
  member CanWrite : bool
  member Capacity : int with get, set
  member CopyTo : destination:Stream * bufferSize:int -> unit
  member CopyToAsync : destination:Stream * bufferSize:int * cancellationToken:CancellationToken -> Task
  member Flush : unit -> unit
  member FlushAsync : cancellationToken:CancellationToken -> Task
  member GetBuffer : unit -> byte[]
  ...

--------------------
MemoryStream() : MemoryStream
MemoryStream(capacity: int) : MemoryStream
MemoryStream(buffer: byte []) : MemoryStream
MemoryStream(buffer: byte [], writable: bool) : MemoryStream
MemoryStream(buffer: byte [], index: int, count: int) : MemoryStream
MemoryStream(buffer: byte [], index: int, count: int, writable: bool) : MemoryStream
MemoryStream(buffer: byte [], index: int, count: int, writable: bool, publiclyVisible: bool) : MemoryStream

Multiple items
type DataContractJsonSerializer =
  inherit XmlObjectSerializer
  new : type:Type -> DataContractJsonSerializer + 6 overloads
  member DateTimeFormat : DateTimeFormat
  member EmitTypeInformation : EmitTypeInformation
  member IgnoreExtensionDataObject : bool
  member IsStartObject : reader:XmlReader -> bool + 1 overload
  member KnownTypes : ReadOnlyCollection<Type>
  member MaxItemsInObjectGraph : int
  member ReadObject : stream:Stream -> obj + 4 overloads
  member SerializeReadOnlyTypes : bool
  member UseSimpleDictionaryFormat : bool
  ...

--------------------
DataContractJsonSerializer(type: System.Type) : DataContractJsonSerializer
DataContractJsonSerializer(type: System.Type, rootName: string) : DataContractJsonSerializer
DataContractJsonSerializer(type: System.Type, rootName: XmlDictionaryString) : DataContractJsonSerializer
DataContractJsonSerializer(type: System.Type, knownTypes: System.Collections.Generic.IEnumerable<System.Type>) : DataContractJsonSerializer
DataContractJsonSerializer(type: System.Type, settings: DataContractJsonSerializerSettings) : DataContractJsonSerializer
DataContractJsonSerializer(type: System.Type, rootName: string, knownTypes: System.Collections.Generic.IEnumerable<System.Type>) : DataContractJsonSerializer
DataContractJsonSerializer(type: System.Type, rootName: XmlDictionaryString, knownTypes: System.Collections.Generic.IEnumerable<System.Type>) : DataContractJsonSerializer

val typeof<'T> : System.Type

type Encoding =
  member BodyName : string
  member Clone : unit -> obj
  member CodePage : int
  member DecoderFallback : DecoderFallback with get, set
  member EncoderFallback : EncoderFallback with get, set
  member EncodingName : string
  member Equals : value:obj -> bool
  member GetByteCount : chars:char[] -> int + 5 overloads
  member GetBytes : chars:char[] -> byte[] + 7 overloads
  member GetCharCount : bytes:byte[] -> int + 3 overloads
  ...

property Encoding.Default: Encoding with get

val internal unjson : jsonString:string -> 't


 Object from Json

val jsonString : string

Multiple items
val string : value:'T -> string

--------------------
type string = System.String

Multiple items
type ASCIIEncoding =
  inherit Encoding
  new : unit -> ASCIIEncoding
  member GetByteCount : chars:string -> int + 3 overloads
  member GetBytes : chars:ReadOnlySpan<char> * bytes:Span<byte> -> int + 3 overloads
  member GetCharCount : bytes:ReadOnlySpan<byte> -> int + 2 overloads
  member GetChars : bytes:ReadOnlySpan<byte> * chars:Span<char> -> int + 2 overloads
  member GetDecoder : unit -> Decoder
  member GetEncoder : unit -> Encoder
  member GetMaxByteCount : charCount:int -> int
  member GetMaxCharCount : byteCount:int -> int
  member GetString : bytes:byte[] * byteIndex:int * byteCount:int -> string
  ...

--------------------
ASCIIEncoding() : ASCIIEncoding

Multiple items
val obj : obj

--------------------
type obj = System.Object