Json 解析 F#

Question

r@".NETFramework\v4.0\Profile\Client\System.Runtime.Serialization.dll"

open System.Runtime.Serialization
open System.Runtime.Serialization.Json

[<DataContract>]
    type geo = {
        [<field: DataMember(Name = "type")>]
        t:string
        [<field: DataMember(Name = "coordinates")>]
        coordinates:string
        }


let decode (s:string)  = 
    let json = new DataContractJsonSerializer(typeof<geo>)
    let byteArray = Encoding.UTF8.GetBytes(s)
    let stream = new MemoryStream(byteArray)
    json.ReadObject(stream) :?> geo

let tw = {"type":"Point","coordinates":[-7.002648,110.449961]}

decode tw 

这返回->
来自命名空间 '' 的结束元素 'coordinates' 预期。从命名空间 '' 中找到元素 'item'
如何定义 DataMember 坐标以便它理解？
非常感谢

Answer 1

引用 System.Runtime.Serialization 和 System.Xml

(互动:#r "System.Runtime.Serialization")

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