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Knockout.js: ko.toJSON does not convert viewmodel to JSON

"{"__ko_mapping__":{"ignore":[],"include":["_destroy"],"copy":[],"mappedProperties": {"__type":true,"Prop1":true,"Prop2":true,"Prop3":true,"Prop4":true,"Prop5":true}}}"

       

{"__type":"DealerModel","Prop1":"","Prop2":"","Prop3":"","Prop4":"","Prop5":"Some Name  ltd"}}}"

       

[Serializable]

Public class DealerModel

{

    public string Porp1 { get; set; }

    public string Porp2 { get; set; }

    public string Porp3 { get; set; }

    public string Porp4 { get; set; }

    public string Porp5 { get; set; }

}

       

var jsonViewModel = '';

            jsonViewModel = ko.toJSON(myNameSpace.ViewModel1);

            jsonViewModel = jsonViewModel.replace(//Date((.*?))//gi, "new Date($1)");

            saveArray[0] = jsonViewModel

 

            jsonViewModel = ko.toJSON(myNameSpace.ViewModel2);

            jsonViewModel = jsonViewModel.replace(//Date((.*?))//gi, "new Date($1)");

            saveArray[1] = jsonViewModel

 

$.ajax({

                type: "POST",

                url: "Services/SomeService.asmx/SaveObjects",

                cache: true,

                contentType: "application/json; charset=utf-8",

                data:"{args:" + ko.toJSON(saveArray) + "}",

                dataType: "json"

            });

       

$.ajax({

            type: "POST",

            url: "Services/SomeService.asmx/SaveObjects",

            data: { args: saveArray }

        });

       

var mappingOptions = { };

var data = { "FirstName": "Bruce". "LastName": "Banner" };

var vmBad = ko.mapping.fromJS(mappingOptions, data);

var vmGood = ko.mapping.fromJS(data, mappingOptions);