Using C# and Json.Net for parsing

Question

An API is returning to me the following json:

{
   "query":{
      "pages":{
         "49123":{
            "pageid":49123,
            "ns":0,
            "title":"Phoenix (constellation)",
            "revisions":[
               {
                  "revid":588710862,
                  "parentid":588710834
               }
            ]
         }
      }
   }
}

I used json2csharp to build a class representing this json (I manually tweaked the names for PageInfo, as it was coughing on this name and calling it __invalid_type__49123 )

public class Revision
{
    public int revid { get; set; }
    public int parentid { get; set; }
}

public class PageInfo
{
    public int pageid { get; set; }
    public int ns { get; set; }
    public string title { get; set; }
    public List<Revision> revisions { get; set; }
}

public class Pages
{
    public PageInfo pageInfo { get; set; }
}

public class Query
{
    public Pages pages { get; set; }
}

public class RootObject
{
    public Query query { get; set; }
}

and tried to parse it:

        var json = "{\"query\":{\"pages\":{\"49123\":{\"pageid\":49123,\"ns\":0,\"title\":\"Phoenix (constellation)\",\"revisions\":[{\"revid\":588710862,\"parentid\":588710834}]}}}}";
        // unescaped version of json below
        // {"query":{"pages":{"49123":{"pageid":49123,"ns":0,"title":"Phoenix (constellation)","revisions":[{"revid":588710862,"parentid":588710834}]}}}}

        var root = JsonConvert.DeserializeObject<RootObject>(json);

I can examine and see root.query.pages all have values, but pageInfo is null. I'm not sure what I'm missing that will allow me to load this json into an object.

Answer 1

Change your class definiton as below. it will work.. (see the definition of Query class)

public class Revision
{
    public int revid { get; set; }
    public int parentid { get; set; }
}

public class Page
{
    public int pageid { get; set; }
    public int ns { get; set; }
    public string title { get; set; }
    public List<Revision> revisions { get; set; }
}

public class Query
{
    public Dictionary<string,Page>  pages { get; set; }
}

public class RootObject
{
    public Query query { get; set; }
}