using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using System.IO;

public class Program

{

    public static void Main()

    {

        var json = @"{""name"":""abc"",""name"":""xyz""}";

​

        var objA = DeserializeObject<MyRequest>(json, new JsonSerializerSettings(), DuplicatePropertyNameHandling.Ignore);

        Console.WriteLine(".Ignore: " + objA.Name);

        var objB = DeserializeObject<MyRequest>(json, new JsonSerializerSettings(), DuplicatePropertyNameHandling.Replace);

        Console.WriteLine(".Replace: " + objB.Name);

        var objC = DeserializeObject<MyRequest>(json, new JsonSerializerSettings(), DuplicatePropertyNameHandling.Error);

        Console.WriteLine(".Error: " + objC.Name); // throws error before getting here

}

    public static T DeserializeObject<T>(string json, JsonSerializerSettings settings, DuplicatePropertyNameHandling duplicateHandling)

    {

        JsonSerializer jsonSerializer = JsonSerializer.CreateDefault(settings);

        using (var stringReader = new StringReader(json))

        using (var jsonTextReader = new JsonTextReader(stringReader))

        {

            jsonTextReader.DateParseHandling = DateParseHandling.None;

            JsonLoadSettings loadSettings = new JsonLoadSettings { 

                DuplicatePropertyNameHandling = duplicateHandling

            };

            var jtoken = JToken.ReadFrom(jsonTextReader, loadSettings);

            return jtoken.ToObject<T>(jsonSerializer);

        }

    }

}

public class MyRequest

    {

        [JsonRequired]

        [JsonProperty("name")]

        public string Name { get; set; }

}