using System;

using System.Text.Json;

using System.Text.Json.Serialization;

public class Program

{

    public static void Main()

    {

        string str = @"{

        ""serialNo"":""test"",

        ""imei"":""imeitest"",

        ""iccId"":""iccIdtest"",

        ""productIdserialNo"":""productIdtest""

        }";

        var deserializeOptions = new JsonSerializerOptions{

           PropertyNamingPolicy = JsonNamingPolicy.CamelCase,

           WriteIndented = true

        };

        var obj = JsonSerializer.Deserialize<DeviceRecord>(str,deserializeOptions);

        Console.WriteLine(obj.IccId);

        var test = new DeviceRecord();

        test.SerialNo="1";

        test.Imei = "2";

        test.IccId="3";

        var serializeOptions = new JsonSerializerOptions{

           PropertyNamingPolicy = JsonNamingPolicy.CamelCase,

           WriteIndented = true

        };

        var obj1 = JsonSerializer.Serialize(test,serializeOptions);

        Console.WriteLine(obj1);

    }

}

​

  public class DeviceRecord

    {

        [JsonPropertyName("serialNo")]

        public string SerialNo { get; set; }

        [JsonPropertyName("imei")]

        public string Imei { get; set; }

        [JsonPropertyName("iccId")]

        public string IccId { get; set; }

        [JsonPropertyName("productId")]

        public string ProductId { get; set; }

  }