Deserializar JSON del cliente en 3.5b2 json.net en vb.net

StackOverflow https://stackoverflow.com/questions/489723

  •  20-08-2019
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Pregunta

Tengo un caso de prueba de un problema que estoy teniendo, básicamente, se crea un objeto JSON en el servidor y dotarla de nuevo a una llamada AJAX hecho en el lado del cliente. Eso funciona bien, sin embargo, cuando trato de devolverlo, y deserializar lado del servidor que llegue la siguiente excepción:

  

No constructor sin parámetros definidos para el tipo de 'System.String'.

     

System.MissingMethodException en   System.Web.Script.Serialization.ObjectConverter.ConvertDictionaryToObject (IDictionary 2 dictionary, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject) at system.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject) at system.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject) at System.Web.Script.Serialization.ObjectConverter.ConvertObjectToType(Object o, Type type, JavaScriptSerializer serializer) at System.Web.Script.Services.WebServiceMethodData.StrongTypeParameters(IDictionary 2   rawParams) a   System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams (Object   objetivo, IDictionary 2 parameters) at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary 2 rawParams)   a   System.Web.Script.Services.RestHandler.ExecuteWebServiceCall (HttpContext   contexto, WebServiceMethodData   methodData)

Default.aspx 

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
    <script src="http://www.json.org/json2.js" type="text/javascript"></script>
    <script src="http://code.jquery.com/jquery-latest.pack.js" type="text/javascript" ></script>
    <script type="text/javascript">
        $(document).ready(function(){
            $.theDate = {};
            $("#Button1").click(function(){
                $.ajax({
                    type: 'POST',
                    url: 'default.aspx/getDate',
                    data: '{}',
                    contentType: 'application/json; charset=utf-8',
                    dataType: 'json',
                    success: function(json){
                        var date = eval("("+json.d+")");
                        $.theDate = date;
                        var pdate = eval("("+json.d.replace(/"\\\/Date\(([0-9]+)[0-9-]+\)\\\/"/gi, 'new Date(parseInt($1,10))')+")");
                        $("#now").val(date.now);
                        $("#pnow").val(pdate.now);
                        $("#strnow").val(date.strnow);
                    },
                    error: function(xmlhr, status, err){
                        console.error(arguments);
                        var response = eval("("+xmlhr.responseText+")");
                        console.log(response);
                    }
                });
            });

            $("#Button2").click(function(){
                var json = JSON.stringify($.theDate);
                json = '{"json":'+json+'}';
                $.ajax({
                    type:'POST',
                    url:'default.aspx/deserialize',
                    data: json,
                    contentType:'application/json; charset=utf-8',
                    dataType: 'json',
                    success: function(json){
                        var date = eval("("+json.d+")");
                        console.log(date);
                    },
                    error: function(xmlhr, status, err){
                        console.error(arguments);
                        var response = eval("("+xmlhr.responseText+")");
                        console.log(response);
                    }
                });
            });
        });
    </script>

</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input id="Button1" type="button" value="Get Date" /><br />
        date.now: <input type="text" id="now" value="" style="width:20em" /><br />
        date.now processed: <input type="text" id="pnow" value="" style="width:30em"><br />
        date.strnow: <input type="text" id="strnow" value=""  style="width:20em"/>
        <input id="Button2" type="button" value="Send Date" /><br />
    </div>
    </form>
</body>
</html>

Default.aspx.vb 

Imports System.Web.Services
Imports Newtonsoft.Json

Partial Class _Default
    Inherits System.Web.UI.Page

    Private Class _date
        <JsonProperty()> Public now As New Date
        <JsonProperty()> Public strnow As String
        Public Sub New()
            now = Date.Today
            strnow = Date.Today.ToLongDateString
        End Sub
    End Class

    <WebMethod()> Public Shared Function getDate() As String
        Dim theDate As New _date
        Dim strJson As String

        strJson = JsonConvert.SerializeObject(theDate)

        Return strJson
    End Function

    <WebMethod()> Public Shared Function deserialize(ByVal json As String) As String
        Dim newDate As _date
        Try
            newDate = JsonConvert.DeserializeObject(json, GetType(_date))
            Return "{""done"":true}"
        Catch ex As Exception
            Throw ex
        End Try
    End Function
End Class

Yo lo agradecería enormemente ayudar en lo que estoy haciendo mal aquí. Gracias de antemano.

¿Fue útil?

Solución

Tuvimos que cambiar 

Private Class _date

a 

Public Class _date

y 

<WebMethod()> Public Shared Function deserialize(ByVal json As String) As String

a 

<WebMethod()> Public Shared Function deserialize(ByVal json As _date) As String
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