Attempt by method 'System.Web.Helpers.Json.Decode(System.String)' to access field 'System.Web.Helpers.Json._serializer' failed

Question

I have the following JSON;

{
"b2c": {
    "languages": {
        "de": {
            "models": {
                "t300": {
                    "name": "Aveo",
                    "bodyTypes": {
                        "t300-4d-my13": {
                            "trimLevels": {
                                "lt": {
                                    "name": "LT",
                                    "variants": {
                                        "1.2_16V_86_Gas_MT": {
                                            "name": "1.2 MT",
                                            "price": {
                                                "EUR": {
                                                    "value": 13990,
                                                    "formatted": "13.990,00 €"
                                                }
                                            },
                                            "infoFeatures": {
                                                "fuel_consumption_extra_urban#consumption": {
                                                    "name": "Kraftstoffverbrauch außerorts ",
                                                    "value": "4.6",
                                                    "formatted": "4,6"
                                                },
                                                "top_speed#kilometer_per_hour": {
                                                    "name": "Höchstgeschwindigkeit",
                                                    "value": "171",
                                                    "formatted": "171"
                                                }
                                            },
                                            "images": null,
                                            "documents": null
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}
}

The values of b2c, de, t300, t300-4d-my13, It etc.. are dynamic but languages, models, bodyTypes, trimLevels, variants, inforFeatures, images and documents would remain same. I need to extract all to access values like languages.["de"], models.["t300"].name, timeLevels.["It"], Variants and infoFeatures, as these keys [""] are dynamics so I am not sure what to refer.

I have tried,

    var jsonSerializer = new JsonSerializer();
    dynamic dynamicObject = jsonSerializer.Deserialize(new JsonTextReader(new StringReader(jsonString)));
    //var level1 = dynamicObject.b2c

I have looked this as well Deserialize JSON into C# dynamic object?

and tried

var dynamicObject = Json.Decode(jsonString);

but receiving following error;

Attempt by method 'System.Web.Helpers.Json.Decode(System.String)' to access field 'System.Web.Helpers.Json._serializer' failed.

I have found above exception answer at [link](http://stackoverflow.com/questions/7066726/attempt-by-method-system-web-helpers-json-cctor-to-access-method-system-we). Can some please let me know who to refer dynamic JSON objects? — SNS, May 07 '13 at 10:40
I could decode your Json string by Json.Decode() and could access languages["de"] etc. I noticed you are using dot(.) between 'languages' and ["de"]. Was that your problem? — bob, Aug 29 '13 at 21:00

score 4 · Answer 1 · edited May 23 '17 at 11:47

4

For us it helped to uncheck "Enable the Visual Studio hosting process" in the Project properties > Debug tab, from the top answer to Attempt by method 'System.Web.Helpers.Json..cctor()' to access method 'System.Web.Helpers.Json.CreateSerializer()' failed

edited May 23 '17 at 11:47

Community

1
1

answered Dec 22 '15 at 16:26

user1568891

386
6
12

score 2 · Answer 2 · answered May 08 '13 at 22:11

2

A general solution would be to use something like Json.net and serialize to C# Object - this is very flexible, and does not conflict with the dynamic nature of the json object coming from the client.

answered May 08 '13 at 22:11

jeffo

410
1
3
9

1

I am working on Json.Net but serializing to C# Objects is absolute nightmare with multi level of data. Thanks for your response. – SNS May 09 '13 at 09:23

score 1 · Answer 3 · answered Mar 24 '14 at 09:06

This error seems to occur when you have multiple projects with different versions of assemblies; eg, if you have JSON.NET 4.5.1 in one project and 5.0.6 in another. Things seem to get sorted if you make sure the same versions exist everywhere in the solution.

Attempt by method 'System.Web.Helpers.Json.Decode(System.String)' to access field 'System.Web.Helpers.Json._serializer' failed

3 Answers3

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