Error deserializing JSON Cannot deserialize JSON object into type 'System.String'

Question

I have the following JSON:

{"workspace": {
  "name":"Dallas",
   "dataStores":"http://.....:8080/geoserver/rest/workspaces/Dallas/datastores.json",
   "coverageStores":"http://.....:8080/geoserver/rest/workspaces/Dallas/coveragestores.json",
   "wmsStores":"http://....:8080/geoserver/rest/workspaces/Dallas/wmsstores.json"}}

And I´m trying to deserialize int this class:

 class objSON {
        public string workspace { get; set; }
        public string name { get; set; }
        public string dataStores { get; set; }
        public string coverageStores { get; set; }
        public string wmsStores { get; set; }}

 objWS_JSON deserContWS = JsonConvert.DeserializeObject<objWS_JSON>(data);
           var coberturas = deserContWS.coverageStores;
           var almacenesDatos = deserContWS.dataStores;
           var almacenesWMS = deserContWS.wmsStores;
           var nombre = deserContWS.name;

And I get the following error:

Cannot deserialize JSON object into type 'System.String'.

Any ideas? Thanks

Kevin Holditch · Accepted Answer · 2011-10-25 15:33:55Z

7

your json is incorrect for the class structure you've provided. The json implies that name, dataStores, coverageStores and wmsSTores are children of a workspace class. I think the class structure you want is this:

public class workspace
{
    public string name { get; set; }
    public string dataStores { get; set;}
    public string coverageStores { get; set;}
    public string wmsStores {get; set;}
}

public class objSON
{
    public workspace workspace {get; set;}
}

try that, if that data structure is not what you are after then you need to change your json.

Ok I've just tried in a sample app and seems to work fine. Here is the code I used:

    class Program
    {
            static void Main(string[] args)
            {

               string str = @"{""workspace"": {
                  ""name"":""Dallas"",
                  ""dataStores"":""http://.....:8080/geoserver/rest/workspaces/Dallas/datastores.json"",
                  ""coverageStores"":""http://.....:8080/geoserver/rest/workspaces/Dallas/coveragestores.json      "",
                  ""wmsStores"":""http://....:8080/geoserver/rest/workspaces/Dallas/wmsstores.json""}}";

                 var obj = JsonConvert.DeserializeObject<objSON>(str);

    }

}

public class workspace
{
    public string name { get; set; }
    public string dataStores { get; set; }
    public string coverageStores { get; set; }
    public string wmsStores { get; set; }
}

public class objSON
{
    public workspace workspace { get; set; }
}

edited Oct 25, 2011 at 15:33

answered Oct 25, 2011 at 15:00

Kevin Holditch

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3 Comments

John Gilbert Over a year ago

Thanks for your answer I solve the error but my elements are null

John Gilbert Over a year ago

objWS_JSON deserContWS = JsonConvert.DeserializeObject<objWS_JSON>(data); var coberturas = deserContWS.coverageStores; var almacenesDatos = deserContWS.dataStores; var almacenesWMS = deserContWS.wmsStores; var nombre = deserContWS.name;

John Gilbert Over a year ago

Sorry Kevin I was failed with the deserialization I forget change, now is working!. Thanks

Jon Skeet · Accepted Answer · 2011-10-25 15:00:31Z

3

In the JSON, workspace contains all the rest, so you should have something like:

class Container {
    public Workspace workspace { get; set; }
}

class Workspace {
    public string name { get; set; }
    public string dataStores { get; set; }
    public string coverageStores { get; set; }
    public string wmsStores { get; set; }
}

At the very least that matches the structure of the JSON - whether it'll work or not is another matter :)

answered Oct 25, 2011 at 15:00

Jon Skeet

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5 Comments

Royi Namir Over a year ago

so JsonConvert.DeserializeObject<Container>(data); ?

Jon Skeet Over a year ago

@RoyiNamir: Yup, I'd expect so.

John Gilbert Over a year ago

Thanks, in data I change the slash \ of my JSON by this /

John Gilbert Over a year ago

Yes, because data is the JSON clean whithout backslashes

Jon Skeet Over a year ago

@JMG: So where do the backslashes come into it at all? It's unclear why you've suddenly brought them up... you shouldn't need to replace anything.

Moo-Juice · Accepted Answer · 2011-10-25 15:00:40Z

0

If you look at the JSON object (it is perhaps better if you laid out your { and } a little more clearly), you'll see that it is trying to serialize all that data in to the workspace field, and not the other properties. I would expect your object to look something more like:

{
   "workspace": "whatever",
   "name":"Dallas",
   "dataStores":"http://.....:8080/geoserver/rest/workspaces/Dallas/datastores.json",
   "coverageStores":"http://.....:8080/geoserver/rest/workspaces/Madrid/coveragestores.json",
   "wmsStores":"http://....:8080/geoserver/rest/workspaces/Madrid/wmsstores.json"
}

answered Oct 25, 2011 at 15:00

Moo-Juice

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