UWP: Nested Custom Types with DataContractJsonSerializer

Question

I am creating a nested custom type with primitive datatypes. I am having a Web APi that returns the data in JSON. using json2csharp.com, I am generating classes for the same.

I have decorated the primitive datatypes in all classes with DataMember and the types with DataContract.

I am using the following code for deserialization:

var resp = httpClient.GetAsync("http://ACTUAL_API_URI").Result;
var res = await resp.Content.ReadAsStringAsync();
var serializer = new DataContractJsonSerializer(typeof(RootObject));
byte[] byteArr= Encoding.ASCII.GetBytes(res);
var ms = new MemoryStream(byteArr);
var deserializedObj= (RootObject)serializer.ReadObject(ms);

I am not getting any exception. but the deserializedObj has null values for all the properties.

Any suggestions ?

Answer 1

You have a couple mistakes.

1. You returns collection of elements and try to deserialize one element instead collection

   public IEnumerable<SampleData> Get()
   {
       return new SampleData[]
       {
           new SampleData()
           {
               Value = 100,
               NestedTypeObject1 = new NestedType1()
               {
                   ID = 101,
                   BD = "Description#1",
                   UD = "Description#2"
               },
               NestedTypeObject2 = new NestedType2()
               {
                   Date = DateTime.Now.ToString(),
                   S1 = "S1 String",
                   S2 = "S2 String"
               }
           }
       };
   }
   

   so you just change your code to

   var serializer = new DataContractJsonSerializer(typeof(List<RootObject>));
   var deserializedObj= (List<RootObject>)serializer.ReadObject(ms);
   

2. You have different model names between service side and client side, just you your SampleData model and all will be good. You must to rename MyNestedType1 to NestedTypeObject1 or add name to DataContractAttribute, e.g:

   [DataContract(Name = "NestedTypeObject1")]
   public class MyNestedType1
   {
       [DataMember]
       public int Id { get; set; }
       [DataMember]
       public string BD { get; set; }
       [DataMember]
       public string UD { get; set; }
   }
   

   It belongs for property names too.