CODEWITHSUNDEEP
jsonserializationjson.net.net-standardhttpresponsemessage
Neville Nazerane
Neville Nazerane

Reputation: 7019

deserialize json to object in netstandard1.0

I am trying to serialize a string that is returned from a http response and I am using netstandard1.0. Not a lot of serializing functions work in this framework, but I finally found a working function. Here is my code so far: 

HttpResponseMessage Response = // initialized else where
var jsonTask = Response.Content.ReadAsStringAsync();
if (!jsonTask.IsCompleted) jsonTask.RunSynchronously();
string json = jsonTask.Result;
Data = JsonConvert.DeserializeObject<MyModel>(json);

However this does not deserialize I get from the http response. It throws an error that the DeserializeObject function is looking for a different format. When I run Result.Content.ReadAsStringAsync(), I get the result in the following format.

"[{\"key\":\"Password\",\"errors\":[\"The Password field is required.\"]},{\"key\":\"UserName\",\"errors\":[\"The UserName field is required.\"]},{\"key\":\"OrganizationUserName\",\"errors\":[\"The OrganizationUserName field is required.\"]}]"

Does anyone know how to deserialize this format?

Upvotes: 0

Views: 369

Answers (1)

dbc
dbc

Reputation: 116731

If you define your MyModel as follows:

public class MyModel
{
    public string key { get; set; }
    public List<string> errors { get; set; }
}

You can deserialize as follows:

var list = JsonConvert.DeserializeObject<List<MyModel>>(json);

Notes:

  • I generated the c# definition for MyModel by uploading your JSON to http://json2csharp.com/.

  • The reason for the exception you are seeing trying to deserialize directly to MyModel is that your outer JSON container is an array, not an object. As explained in the standard, JSON has two types of container:

    1. An array which is an ordered collection of values. An array begins with [ (left bracket) and ends with ] (right bracket). Values are separated by , (comma).

    2. An object which is an unordered set of name/value pairs. An object begins with { (left brace) and ends with } (right brace).

    In the Json.NET Serialization Guide: IEnumerable, Lists, and Arrays it is explained that JSON arrays are converted from and to .Net types implementing IEnumerable. So that's what you need to do.

  • If you know the array will contain no more than one element, you can use SingleOrDefault() to extract that single element:

    Data = list.SingleOrDefault();

    However, in the example included in you question, the outer array has 3 items, so this is not appropriate.

Sample fiddle.

Upvotes: 1

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