CODEWITHSUNDEEP
c#jsonserializationjson.net
tanxin
tanxin

Reputation: 165

How to deserialize a JSON stream to a JToken?

I want to deserialize a JSON stream to an JToken object (It could be JObject/JArray/JToken, but referred to as JToken). I want to use the result as an JToken object, not some other class instance like most examples show.

How can this be done?

Upvotes: 4

Views: 1706

Answers (1)

dbc
dbc

Reputation: 116806

To load a Stream as a JToken, you can use either of the following:

First create one or both of the following methods:

public static partial class JsonExtensions
{
    public static JToken LoadFromStream(Stream s, JsonLoadSettings settings = default, bool closeInput = true, FloatParseHandling? floatParseHandling = default, DateParseHandling? dateParseHandling = default)
    {
        using (var reader = new StreamReader(s))
        using (var jsonReader = new JsonTextReader(reader) { CloseInput = closeInput })
        {
            if (floatParseHandling != null)
                jsonReader.FloatParseHandling = floatParseHandling.Value;
            if (dateParseHandling != null)
                jsonReader.DateParseHandling = dateParseHandling.Value;
            // You might also need to configure DateTimeZoneHandling, DateFormatString and Culture to fully control loading of dates and times.
            return JToken.Load(jsonReader, settings);
        }
    }       

    public static T Deserialize<T>(Stream s, JsonSerializerSettings settings = default, bool closeInput = true)
    {
        // This method taken from this answer https://stackoverflow.com/a/22689976/3744182
        // By https://stackoverflow.com/users/740230/ygaradon
        // To https://stackoverflow.com/questions/8157636/can-json-net-serialize-deserialize-to-from-a-stream
        // And modified to pass in settings and control whether the input stream is closed
        using (var reader = new StreamReader(s))
        using (var jsonReader = new JsonTextReader(reader) { CloseInput = closeInput })
        {
            JsonSerializer ser = JsonSerializer.CreateDefault(settings);
            return ser.Deserialize<T>(jsonReader);
        }
    }
}

Given those methods, you can do either:

var token = JsonExtensions.LoadFromStream(stream, new JsonLoadSettings {  /* Add your preferred load settings here */});

Or

var token = JsonExtensions.Deserialize<JToken>(stream, new JsonSerializerSettings { /* Add your preferred serializer settings here */ });

Notes:

Demo fiddle here.

Upvotes: 5

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