using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

​

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

    // https://stackoverflow.com/questions/48470971/how-to-deserialize-a-jsonp-response

    public class MyType

    {

        public Decimal total;

        public int lower;

        public int upper;

    }

​

    public static class JsonExtensions

    {

        public static T DeserializeEmbeddedJsonP<T>(Stream stream)

        {

            using (var textReader = new StreamReader(stream))

                return DeserializeEmbeddedJsonP<T>(textReader);

        }

        public static T DeserializeEmbeddedJsonP<T>(TextReader textReader)

        {

            using (var jsonReader = new JsonTextReader(textReader.SkipPast('(')))

            {

                var settings = new JsonSerializerSettings

                {

                    CheckAdditionalContent = false,

                };

                return JsonSerializer.CreateDefault(settings).Deserialize<T>(jsonReader);

            }

        }

    }

​

    public static class TextReaderExtensions

    {

        public static TTextReader SkipPast<TTextReader>(this TTextReader reader, char ch) where TTextReader : TextReader

        {

            while (true)

            {

                var c = reader.Read();

                if (c == -1 || c == ch)

                    return reader;

            }

        }

    }

​

    static class TestClass

    {

        public static void Test()

        {

            var bytes = GetJson();

​

            Console.WriteLine("Input JSON: ");

            Console.WriteLine(Encoding.UTF8.GetString(bytes));

​

            // Make stream be read-only to emulate behavior of a response stream.

            using (var stream = new MemoryStream(bytes, false))

            {

                var myType = JsonExtensions.DeserializeEmbeddedJsonP<MyType>(stream);

​

                Console.WriteLine("\nDeserialized and re-serialized {0}:", myType);

                Console.WriteLine(JsonConvert.SerializeObject(myType, Formatting.Indented));

            }

            // Some unit tests for SkipPast()

            using (var textReader = new StringReader("").SkipPast('('))

            {

                var s = textReader.ReadToEnd();

                Assert.IsTrue(s == "");

            }

            using (var textReader = new StringReader("hello").SkipPast('('))

            {

                var s = textReader.ReadToEnd();

                Assert.IsTrue(s == "");

            }

            using (var textReader = new StringReader("(((").SkipPast('('))

            {

                var s = textReader.ReadToEnd();

                Assert.IsTrue(s == "((");

            }

        }

​

        static byte [] GetJson()

        {

            var json = @"parseResponse({

""total"" : ""13,769"",

""lower"" : ""1"",

""upper"" : ""20""})";

            return Encoding.UTF8.GetBytes(json);

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: " + Environment.Version);

            Console.WriteLine("Json.NET version: " + typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​

    public class AssertionFailedException : System.Exception

    {

        public AssertionFailedException() : base() { }

​

        public AssertionFailedException(string s) : base(s) { }

    }

​

    public static class Assert

    {

        public static void IsTrue(bool value)

        {

            IsTrue(value, "failed");

        }

​

        public static void IsTrue(bool value, string message)

        {

            if (value == false)

                throw new AssertionFailedException(message ?? "failed");

        }

    }

​