Serializing/Deserializing Dictionary of objects with JSON.NET

by

I think that is a bug in an older version of Json.NET. If you aren’t already using the latest version, upgrade and try again.

    public class UrlStatus
    {
      public int Status { get; set; }
      public string Url { get; set; }
    }


    [TestMethod]
    public void GenericDictionaryObject()
    {
      Dictionary<string, object> collection = new Dictionary<string, object>()
        {
          {"First", new UrlStatus{ Status = 404, Url = @"http://www.bing.com"}},
          {"Second", new UrlStatus{Status = 400, Url = @"http://www.google.com"}},
          {"List", new List<UrlStatus>
            {
              new UrlStatus {Status = 300, Url = @"http://www.yahoo.com"},
              new UrlStatus {Status = 200, Url = @"http://www.askjeeves.com"}
            }
          }
        };

      string json = JsonConvert.SerializeObject(collection, Formatting.Indented, new JsonSerializerSettings
      {
        TypeNameHandling = TypeNameHandling.All,
        TypeNameAssemblyFormat = FormatterAssemblyStyle.Simple
      });

      Assert.AreEqual(@"{
  ""$type"": ""System.Collections.Generic.Dictionary`2[[System.String, mscorlib],[System.Object, mscorlib]], mscorlib"",
  ""First"": {
    ""$type"": ""Newtonsoft.Json.Tests.Serialization.TypeNameHandlingTests+UrlStatus, Newtonsoft.Json.Tests"",
    ""Status"": 404,
    ""Url"": ""http://www.bing.com""
  },
  ""Second"": {
    ""$type"": ""Newtonsoft.Json.Tests.Serialization.TypeNameHandlingTests+UrlStatus, Newtonsoft.Json.Tests"",
    ""Status"": 400,
    ""Url"": ""http://www.google.com""
  },
  ""List"": {
    ""$type"": ""System.Collections.Generic.List`1[[Newtonsoft.Json.Tests.Serialization.TypeNameHandlingTests+UrlStatus, Newtonsoft.Json.Tests]], mscorlib"",
    ""$values"": [
      {
        ""$type"": ""Newtonsoft.Json.Tests.Serialization.TypeNameHandlingTests+UrlStatus, Newtonsoft.Json.Tests"",
        ""Status"": 300,
        ""Url"": ""http://www.yahoo.com""
      },
      {
        ""$type"": ""Newtonsoft.Json.Tests.Serialization.TypeNameHandlingTests+UrlStatus, Newtonsoft.Json.Tests"",
        ""Status"": 200,
        ""Url"": ""http://www.askjeeves.com""
      }
    ]
  }
}", json);

      object c = JsonConvert.DeserializeObject(json, new JsonSerializerSettings
      {
        TypeNameHandling = TypeNameHandling.All,
        TypeNameAssemblyFormat = FormatterAssemblyStyle.Simple
      });

      Assert.IsInstanceOfType(c, typeof(Dictionary<string, object>));

      Dictionary<string, object> newCollection = (Dictionary<string, object>)c;
      Assert.AreEqual(3, newCollection.Count);
      Assert.AreEqual(@"http://www.bing.com", ((UrlStatus)newCollection["First"]).Url);

      List<UrlStatus> statues = (List<UrlStatus>) newCollection["List"];
      Assert.AreEqual(2, statues.Count);
    }
  }

Edit, I just noticed you mentioned a list. TypeNameHandling should be set to All.

Documentation: TypeNameHandling setting

More Related Contents:

  1. Parse JSON in C#
  2. Create a strongly typed c# object from json object with ID as the name
  3. How to deserialize an array of values with a fixed schema to a strongly typed data class?
  4. Deserializing JSON into an object
  5. JSON.Net throws StackOverflowException when using [JsonConvert()]
  6. How to parse huge JSON file as stream in Json.NET?
  7. Searching for a specific JToken by name in a JObject hierarchy
  8. Unexpected character encountered while parsing value
  9. Parsing JSON Object with variable properties into strongly typed object
  10. How can I deserialize JSON with C#?
  11. Order of serialized fields using JSON.NET
  12. Json.NET serialize object with root name
  13. Set default global json serializer settings
  14. Serialize Property, but Do Not Deserialize Property in Json.Net
  15. How to deserialize a JSON array into an object using Json.Net?
  16. Why are some members missing when trying to print an object by serializing to JSON?
  17. Cannot deserialize JSON array into type – Json.NET
  18. How to apply indenting serialization only to some properties?
  19. How to apply ObjectCreationHandling.Replace to selected properties when deserializing JSON?
  20. DateTime column type becomes String type after deserializing DataTable
  21. Modify existing object with new partial JSON data using Json.NET
  22. Accessing properties with a dot in their name
  23. json deserialize from legacy property names
  24. Deserialize json object with dynamic items in C#
  25. Json.NET JSONPath query not returning expected results
  26. JSON.NET serialize JObject while ignoring null properties
  27. Force JsonConvert.SerializeXmlNode to serialize node value as an Integer or a Boolean
  28. Streaming large list of data as JSON format using Json.net
  29. Extract data from Json string
  30. How do I parse a JSON object in C# when I don’t know the key in advance?

Leave a Comment