Deserialize json dictionary to c#

Question

I'm getting this json from an API.

string json = "{'serviceSession':{ '123123123':[{'apn':'abc'},{'apn':'bcd'},{'apn':'def'}]}}";

When I'm trying to deserialize it with

public class ServiceSession { public Dictionary<string, List<ServiceSessionType>> ServiceSessions { get; set; } } public class ServiceSessionType { public string Apn { get; set; } }

and

var test = JsonConvert.DeserializeObject<ServiceSession> (json);

I'm getting null.

What's wrong? any ideas?

Thank you in advance!!

The c# data structure does not match the json data structure. Either change the way the json is composed, or change the class structure in c#. — Travis J
– Travis J, Commented May 2, 2018 at 6:55
Your model doesn't match your JSON. 123123123 is an array of objects, not a dictionary. Even if it were a dictionary (which it most definately is not) it would still blow up because you would have duplicate keys. — Sam Axe
– Sam Axe, Commented May 2, 2018 at 6:56
@zaitsman: oh man. totally misread that one didnt I :) Thanks. — Sam Axe
– Sam Axe, Commented May 2, 2018 at 6:58

fubo · Accepted Answer · 2018-05-02 07:30:42Z

There is a missmatch between the datastructure and the json string. You need to change:

public class ServiceSession { //ServiceSessions replaced by serviceSession public Dictionary<string, List<ServiceSessionType>> serviceSession { get; set; } }

Another solution is to add a DataMember attribute which tells the deserializer the name.

[System.Runtime.Serialization.DataContract] public class ServiceSession { [System.Runtime.Serialization.DataMember(Name = "serviceSession")] public Dictionary<string, List<ServiceSessionType>> ServiceSessions { get; set; } }

This makes sense if you can't change the class or the name is a keyword in C#.

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