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/49030516/how-can-i-ignore-this-blank-array-while-deserializing-in-c

​

    public class TolerantObjectCollectionConverter<TItem> : JsonConverter

    {

        public override bool CanConvert(Type objectType)

        {

            return !objectType.IsArray && objectType != typeof(string) && typeof(ICollection<TItem>).IsAssignableFrom(objectType);

        }

​

        public override bool CanWrite { get { return false; } }

​

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

        {

            throw new NotImplementedException();

        }

​

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

        {

            // Get contract information

            var contract = serializer.ContractResolver.ResolveContract(objectType) as JsonArrayContract;

            if (contract == null || contract.IsMultidimensionalArray || objectType.IsArray)

                throw new JsonSerializationException(string.Format("Invalid array contract for {0}", objectType));

​

            // Process the first token

            var tokenType = reader.SkipComments().TokenType;

            if (tokenType == JsonToken.Null)

                return null;

            if (tokenType != JsonToken.StartArray)

                throw new JsonSerializationException(string.Format("Expected {0}, encountered {1} at path {2}", JsonToken.StartArray, reader.TokenType, reader.Path));

​

            // Allocate the collection

            var collection = existingValue as ICollection<TItem> ?? (ICollection<TItem>)contract.DefaultCreator();

​

            // Process the collection items

            while (reader.Read())

            {

                switch (reader.TokenType)

                {

                    case JsonToken.EndArray:

                        return collection;

​

                    case JsonToken.StartObject:

                    case JsonToken.Null:

                        collection.Add(serializer.Deserialize<TItem>(reader));

                        break;

​

                    default:

                        reader.Skip();

                        break;

                }

            }

            // Should not come here.

            throw new JsonSerializationException("Unclosed array at path: " + reader.Path);

        }

    }

​

    public static partial class JsonExtensions

    {

        public static JsonReader SkipComments(this JsonReader reader)

        {

            while (reader.TokenType == JsonToken.Comment && reader.Read())

                ;

            return reader;

        }

    }

​

    public class RootObject

    {

        [JsonProperty("total_events")]

        public int TotalEvents { get; set; }

​

        [JsonProperty("json.appID")]

        [JsonConverter(typeof(TolerantObjectCollectionConverter<JsonAppID>))]

        public List<JsonAppID> AppIds { get; set; }

​

        [JsonProperty("unique_field_count")]

        public int UniqueFieldCount { get; set; }

    }

​

    public class JsonAppID

    {

        [JsonProperty(PropertyName = "count")]

        public int Count { get; set; }

​

        [JsonProperty(PropertyName = "term")]

        public string Term { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

            foreach (var json in GetJson())

                Test(json);

            Console.WriteLine("\nTests passed.");

        }

​

        static void Test(string json)

        {

            Console.WriteLine("\nTesting JSON: ");

            Console.WriteLine(json);

​

            var result = JsonConvert.DeserializeObject<RootObject>(json);

​

            var json2 = JsonConvert.SerializeObject(result, Formatting.Indented);

​

            Console.WriteLine("Re-serialized result: ");

            Console.WriteLine(json2);

​

            Assert.IsTrue(JToken.Parse(json).SelectTokens("json.appID[*]").Where(t => t.Type == JTokenType.Object || t.Type == JTokenType.Null)

                .SequenceEqual(JToken.Parse(json2).SelectTokens("json.appID[*]").Where(t => t.Type == JTokenType.Object || t.Type == JTokenType.Null)));

        }

​

        static IEnumerable<string> GetJson()

        {

            var json = new[]

            {

                @"{

  ""total_events"": 3551574,

  ""json.appID"": [

    {

      ""count"": 3551024,

      ""term"": 1

    },

    {

      ""count"": 256,

      ""term"": 2

    },

    []                /* <----- I need to ignore this empty array */

  ],

  ""unique_field_count"": 2

}",

                @"{

  ""total_events"": 3551574,

  ""json.appID"": /* Some Comment */ [

    null,

    ""bad string"",

    101010101,

    {

      ""count"": 3551024,

      ""term"": 1

    },

    {

      ""count"": 256,

      ""term"": 2

    },

    [],                /* <----- I need to ignore this empty array */

    [1,1,,1,1],

  ],

  ""unique_field_count"": 2

}",

            };

​

            return 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");

        }

    }

​