using System;

using System.Collections.Generic;

using System.Linq;

using System.Reflection;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

​

​

public class Program

{

    public static void Main()

    {

        var users = new List<UserDTO>

        {

            new UserDTO { Id = 1, Name = "Joe Schmoe" },

            new UserDTO { Id = 2, Name = "John Doe" },

            new UserDTO { Id = 3, Name = "Bob Smith" }

        };

        PagedData<UserDTO> data1 = new PagedData<UserDTO>("Users", users, 3, 1, 0, 10);

        string json = JsonConvert.SerializeObject(data1, Formatting.Indented);

        Console.WriteLine(json);

        Console.WriteLine(new string('-', 40));

​

        var items = new List<ItemDTO>

        {

            new ItemDTO { Id = 1, Name = "Hammer" },

            new ItemDTO { Id = 2, Name = "Saw" },

            new ItemDTO { Id = 3, Name = "Drill" },

            new ItemDTO { Id = 4, Name = "Wrench" },

        };

        PagedData<ItemDTO> data2 = new PagedData<ItemDTO>("Items", items, 4, 1, 0, 10);

        json = JsonConvert.SerializeObject(data2, Formatting.Indented);

        Console.WriteLine(json);

    }

}

​

​

public class PagedDataConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return objectType.IsGenericType && objectType.GetGenericTypeDefinition() == typeof(PagedData<>);

    }

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

    {

        Type type = value.GetType();

​

        var bindingFlags = BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public;

        string dataPropertyName = (string)type.GetProperty("DataPropertyName", bindingFlags).GetValue(value);

        if (string.IsNullOrEmpty(dataPropertyName)) 

        {

            dataPropertyName = "Data";

        }

​

        JObject jo = new JObject();

        jo.Add(dataPropertyName, JArray.FromObject(type.GetProperty("Data").GetValue(value)));

        foreach (PropertyInfo prop in type.GetProperties().Where(p => !p.Name.StartsWith("Data")))

        {

            jo.Add(prop.Name, new JValue(prop.GetValue(value)));

        }

        jo.WriteTo(writer);

    }

    public override bool CanRead

    {

        get { return false; }

    }

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

    {

        throw new NotImplementedException();

    }

}

​

​

[JsonConverter(typeof(PagedDataConverter))]

public class PagedData<T>

{

    public PagedData(string dataPropertyName, IEnumerable<T> data, int count, int currentPage, int offset, int rowsPerPage, int? previousPage = null, int? nextPage = null)

    {

        DataPropertyName = dataPropertyName;

        Data = data;

        Count = count;

        CurrentPage = currentPage;

        Offset = offset;

        RowsPerPage = rowsPerPage;

        PreviousPage = previousPage;

        NextPage = nextPage;

    }

    private string DataPropertyName { get; set; }

    public IEnumerable<T> Data { get; private set; }

    public int Count { get; private set; }

    public int CurrentPage { get; private set; }

    public int Offset { get; private set; }

    public int RowsPerPage { get; private set; }

    public int? PreviousPage { get; private set; }

    public int? NextPage { get; private set; }

}

​

public class UserDTO

{

    public int Id { get; set; }

    public string Name { get; set; }

}

​

public class ItemDTO

{

    public int Id { get; set; }

    public string Name { get; set; }

}

​

​