F# DataContractJsonSerializer StackOverflowException

dataElementsList : TypesAndData.DataElement list

is a list of 50,000 records (actually many more but let's start small). I am trying to serialize to a JSON file:

let ser = Json.DataContractJsonSerializer(typeof<TypesAndData.DataElement list>) 
use ofs = File.OpenWrite(fileName)
let result = ser.WriteObject(ofs, dataElementsList)

and am getting the infamous StackOverflowException. to be precise:

An unhandled exception of type 'System.StackOverflowException' occurred in FSharp.Core开发者_如何学Python.dll

any advice?

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You should not try to serialize an F# list this way. Convert it to an array with List.toArray.

(I expect that the DataContract serializers see lists as nested 'first'/'rest' data structures, which means 50000 tree depth of Json/Xml, which is not what you want.)