Problem with JsonProperty

[Ole Jørgensen]

I have some problems deserializing a json "class" in red below (yes, unfortunately it is literally named "attribute"):

 

{

 

    "spatialReference": {

        "wkid": 1234

    },

    "geometryType": "Point",

    "features": [

        {

            "attribute": {

                "husnr": "1",

                "vej": {

                    "kode": "1111",

                    "navn": "road name here",

                    "href": "/?servicename=keys&method=vej&vejkode=1111"

                },

                "postdistrikt": {

                    "kode": "2222",

                    "navn": "city name here",

                    "href": "/?servicename=keys&method=postdistrikt&postnr=2222"

                },

                "kommune": {

                    "kode": "3333",

                    "navn": "municipality name here",

                    "href": "?servicename=keys&method=kommune&komkode=3333"

                }

            },

            "geometry": {

                "x": 715914.18,

                "y": 6180299.52

            }

        }

    ]

}

The json is valid and I can see that when I call the method from a browser I get valid json back. But when I try deserialize it, then all the values are there except the "attribute" value - the value is null (and not a "attribute" object).

 

This is my deserializer:

 

public class KeysDeserializer : IDeserializer {
    #region IDeserializer Members
    public T Deserialize<T>( IRestResponse response ) {
        var text = response.Content; if ( String.IsNullOrEmpty(text) ) text = {};
        var json = new Newtonsoft.Json.JsonSerializer( );
        json.NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore;
        json.ObjectCreationHandling = Newtonsoft.Json.ObjectCreationHandling.Replace;
        json.MissingMemberHandling = Newtonsoft.Json.MissingMemberHandling.Ignore;
        json.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Serialize;
        var sr = new StringReader( text );
        var reader = new JsonTextReader( sr );
        var result = json.Deserialize( reader, typeof( T ) );
        reader.Close( );
        return (T)result;
    }
    public string DateFormat { get; set; }
    public string Namespace { get; set; }
    public string RootElement { get; set; }
    #endregion
}

 

How do I make the deserializer accept that the JsonProperty literally is called "attribute"?

 

I can't call te json C# class Attribute, because then my code won't compile, ie. I can't do this:

 

    public class Feature  {
        [JsonProperty( "attribute" )]
        public Attribute Attribute { get; set; }

// <--- compile error: 'PostAddress.Feature' does not contain a definition for 'Attribute'

// and no extension method 'Attribute' accepting a first argument of type 'PostAddress.Feature'

// could be found (are you missing a using directive or an assembly reference?) 

        [JsonProperty( "geometry" )]
        public PointGeometry Geometry { get; set; }
    }

 

but i can do this:

 

    public class Feature  {
        [JsonProperty( "attribute" )]
        public Attribute Attributes { get; set; } // compiles fine
        [JsonProperty( "geometry" )]
        public PointGeometry Geometry { get; set; }
    }
    public class PostAdresse {
        [JsonProperty( "spatialReference" )]
        public SpatialReference SpatialReference { get; set; }

        [JsonProperty( "geometryType" )]
        public string GeometryType { get; set; }

        [JsonProperty( "features" )]
        public IList<Feature> Features { get; set; }
    }

    public class Attribute {
        [JsonProperty( "husnr" )]
        public string Husnr { get; set; }

        [JsonProperty( "vej" )]
        public Vej Vej { get; set; }

        [JsonProperty( "postdistrikt" )]
        public Postdistrikt Postdistrikt { get; set; }

        [JsonProperty( "kommune" )]
        public Kommune Kommune { get; set; }
    }

 

Has anyone seen this before, and how did they work around it?

[Cristovão Morgado]

I've seen that! I ussally use dataanotation to get by ...

 [DataContract]

    public class Propertie

    {

        [DataMember(Name = "Property")]

        public string Label{ get; set; }

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--
Cristovao Morgado
@TheSaintr

[Cristovão Morgado]

Ahh I use json.net

--
Cristovao Morgado
@TheSaintr

[Ole Jørgensen]

Hi Cristovão

 

but I do use json.net : ) I can't remember why I don't use DataContract and DataMember attributes. Maybe I should try to use them again.

 

This might be a bug somewhere.. now I have removed all Nuget packages and merged the current json.net and Restsharp windows phone projects into my solution, and now I get this error instead:

 

Error 1 Delegate 'System.Action<RestSharp.IRestResponse<PostAdresse>,RestSharp.RestRequestAsyncHandle>' does not take 1 arguments C:\Dev\keys\keysPhoneApp\PostAdressePage.xaml.cs 245 78 keysPhoneApp

This I where the error is:

 

private void DownloadPostAddress() {
    var client = CreateClient( PostAdresse.Namespace  );
    var template = String.Format( "?servicename=keys&method=padresse&road={0}&houseno={1}&postno={2}", "First Ave*", "", "123" );
    var request = CreateRequest( template );
    var asyncHandle = client.ExecuteAsync<PostAdresse>( request, response => {

// <-- error
        _nearestAdresse = response.Data;
        DisplayAddresses( ); // show the _nearestAdresse on the map
    } );
}

internal static RestClient CreateClient( string ns ) {  

// the server sends text/plain and not application/json so

// detach any text/plain deserializers and attach KeysDeserializer to it
    var client = new RestClient( Constants.ApiBaseUrl ); 
    client.RemoveHandler( "text/plain;charset=utf-8" );
    var aad = new KeysDeserializer { Namespace = ns };
    client.AddHandler( "text/plain;charset=utf-8", aad );
    return client;
}

internal static RestRequest CreateRequest( string template ) {
    var request = new RestRequest( template, Method.GET );
    request.RequestFormat = DataFormat.Json;

// make sure KeysDeserializer is used
    request.OnBeforeDeserialization = resp => { resp.ContentType = "application/json"; };
    request.OnBeforeDeserialization = resp => { resp.ContentEncoding = "utf-8"; };
    return request;
}

Does anyone know how I can get around this?

 

 

2013/3/4 Cristovão Morgado <cristova...@gmail.com>

[Cristovão Morgado]

this is how I usually use RESTSHARP

   public void GetCompanies(Action<Models.Output.Companies> sucess, Action<string> failure)

        {

            if (hasNetworkConnection)

            {

                string Url = Constants.URLs.LIST_COMPANIES;

                var client = new RestClient(Url);

                var rq = new RestRequest("", Method.GET);

                rq.RequestFormat = DataFormat.Json;

                rq.Parameters.Add(new Parameter { Name = "api_key", Value = Constants.AppKeys.APP_KEY, Type = ParameterType.GetOrPost });

                rq.Parameters.Add(new Parameter { Name = "limit", Value = 3000, Type = ParameterType.GetOrPost });

                try

                {

                    var asyncHandle = client.ExecuteAsync(rq, (response, async) =>

                    {

                        Debug.WriteLine(response.Content);

                        if (response.StatusCode == HttpStatusCode.OK)

                        {

                            var r = JsonConvert.DeserializeObject<Models.Output.Companies>(response.Content);

                            sucess(r);

                        }

                        else

                        {

                            failure(response.ErrorMessage);

                        }

                    });

                }

                catch (Exception)

                {

                    failure("ocorreu um erro, tente mais tarde");

                    throw;

                }

            }

            else

            {

                failure("O seu telefone está sem internet");

            }

        }

[Ole Jørgensen]

Thank you, I will keep that technique in mind! 

In this case it turned out to be caused by the order (or lack) of my using statements:

It was:

using System.Collections.Generic;

using Newtonsoft.Json;

using System.Diagnostics;

using System;

when i changed it to

using System.Collections.Generic;

using Newtonsoft.Json;

using System;

using RestSharp;

using System.Diagnostics;

then the error 1 below and code works fine

so if you see 

Error Delegate 'System.Action<RestSharp.IRestResponse<T>,RestSharp.RestRequestAsyncHandle>' does not take 1 arguments 

then check your imports!

[Cristovão Morgado]

that was an example using WindowsPhone RESTSHARP