Sending multiple parameters XMLHttpRequest and WCF-CodePudding

I'm trying to send multiple parameters to a WCF service. Server side I log the incoming data. Where errors 1 and 2 are logged, but 3 and 4 are not. I tried debugging to be able to step through, but the client-side javascript call is not triggering my server-side code so I can step through.

What am I missing?

Request payload from Chrome Developer Console:

<script type="text/javascript">
 
    $(document).ready(function () {
        var xhr = new XMLHttpRequest();
        xhr.open('POST', 'https://www.example.com/api/multipleparams');
        xhr.setRequestHeader('Content-Type', 'application/json'); 
        xhr.send(JSON.stringify({ str: { "idtoken": "e46541", "lang": "dfgfdgfdg" } }));
    });

</script>   

<Runtime.Serialization.DataContract>
Public Class oAuthUserSigninDetails

    Private _idtoken As String
    <Runtime.Serialization.DataMember>
    Public Property idtoken As String
        Get
            Return _idtoken
        End Get
        Set(ByVal value As String)
            _idtoken = value
        End Set
    End Property

    Private _lang As String
    <Runtime.Serialization.DataMember>
    Public Property lang As String
        Get
            Return _lang
        End Get
        Set(ByVal value As String)
            _lang = value
        End Set
    End Property
End Class



<OperationContract()>
<Web.WebInvoke(Method:="POST", ResponseFormat:=Web.WebMessageFormat.Json, BodyStyle:=Web.WebMessageBodyStyle.Bare, UriTemplate:="multipleparams")>
Function multipleparams(ByVal str As oAuthUserSigninDetails) As Stream

Public Function multipleparams(ByVal str As oAuthUserSigninDetails) As Stream Implements Iapi.multipleparams
    LogError("1 multipleparams")
    LogError("2 str", str.ToString)
    LogError("3 idtoken", str.idtoken.ToString)
    LogError("4 lang", str.lang.ToString)

End Function

CodePudding user response：

I think 3 and 4 are not logged because they have null values and ToString cause a null exception and since they are both string you don't need to use ToString at all.

When you accept a class as an argument in your OperationContract, I don't think you need to specify the argument name when you posting a JSON request.

xhr.send(JSON.stringify({ "idtoken": "e46541", "lang": "dfgfdgfdg" }));