How to deserialize a JSON array with nested arrays of objects

Question

I have a JSON string as follows and want to deserialize it:

[[{"campaignId":201410018,"programCode":"54321"}],[{"campaignId":201410018,"programCode":"54321"}]]

I have created some classes as follows:

public class Rootclass
{
    public List<JSONResponse> rootClass { get; set; }
}

public class JSONResponse
{
    public int campaignId { get; set; }
    public string programCode { get; set; }
}

I am calling this JSON.NET method to deserialize the JSON:

List<Rootclass> myDeserializedObjList = (List<Rootclass>)Newtonsoft.Json.JsonConvert.DeserializeObject(json, typeof(List<Rootclass>));

But I am getting the error below:

Cannot deserialize JSON array (i.e. [1,2,3]) into type 'JSON_Test.Rootclass'.
The deserialized type must be an array or implement a collection interface like IEnumerable, ICollection or IList.

What am I doing wrong?

Brian Rogers · Accepted Answer · 2014-10-21 02:47:09Z

4

Your JSON represents a List<List<JSONResponse>>, not a List<RootClass>. Try it like this:

List<List<JSONResponse>> myDeserializedObjList = 
    JsonConvert.DeserializeObject<List<List<JSONResponse>>>(json);

Fiddle: https://dotnetfiddle.net/geRLdb

answered Oct 21, 2014 at 2:47

Brian Rogers

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2 Comments

Israq Khan Over a year ago

How can a deserialize below JSON string. string json = @"[[{""campaignId"":201410018,""programCode"":""54321""},{""reason"":201410018,""about"":""54321""}],[{""campaignId"":201410019,""programCode"":""54322""},{""reason"":201410018,""about"":""54321""}]]";

Brian Rogers Over a year ago

There are several possible solutions. The quick-and-dirty way is simply to add the reason and about properties to your JSONResponse object. See fiddle here. If you want separate classes for the objects containing campaignId versus reason, then you will need to use a JsonConverter. A third possibility is to deserialize to a dynamic or a JToken instead of using strongly-typed classes.

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