using System;

using System.Collections.Generic;

using System.Runtime.Serialization;

using System.Text.Json.Serialization;

​

[DataContract]

public class GoogleReCaptchaResponse

{

    [DataMember(Name = "success")]

    public bool Success

    {

        get;

        set;

    }

​

    [DataMember(Name = "error-codes")]

    public List<string> ErrorCodes

    {

        get;

        set;

    }

​

    [JsonExtensionData]

    public Dictionary<string, object> ExtensionData

    {

        get;

        set;

    }

}

​

public class Program

{

    public static void Main()

    {

        GoogleReCaptchaResponse json = System.Text.Json.JsonSerializer.Deserialize<GoogleReCaptchaResponse>("{ \"success\": false, \"error-codes\": [\"invalid-input-response\",\"invalid-input-secret\"]}");

        if (json.ErrorCodes == null)

        {

            Console.WriteLine("no Error Codes");

        }

        else

        {

            Console.WriteLine("Error Codes!");

        }

    }

}