我想用webapi写一个方法，返回一个数组的JISON串，使用 ASP.NET Core 创建 Web API

string[] myTempID = new string[5];

myTempID [0]="1";
myTempID [1]="2";
myTempID [2]="3";
myTempID [3]="4";
myTempID [4]="5";

怎么将myTempID这个数组生成JISON串传出？

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Web.Http.Description;
 
namespace WebSocket.Api
{
    /// <summary>
    /// List文章列表
    /// </summary>
    public class ListController : ApiController
    {
        // GET api/<controller>
        /// <summary>
        /// Listjson方法
        /// </summary>
        /// <returns></returns>
        [AcceptVerbs("GET", "POST")]
        [Route("API/List/Listjson/")]
        [ResponseType(typeof(ReturnResult))]
        public HttpResponseMessage Listjson()
        {
            ReturnResult result = new ReturnResult() {code = 0,msg="成功"};
            result.data = JsonConvert.SerializeObject(new string[] { "value1", "value2" });
            string json = JsonConvert.SerializeObject(result); 
            return new HttpResponseMessage { Content = new StringContent(json, System.Text.Encoding.UTF8, "application/json") };
        }
 
    }
 
    internal class ReturnResult
    {
        /// <summary>
        ///数据状态一切正常的状态码 0:成功，1：失败
        /// </summary>
        public int code { get; set; } = 1;
 
        /// <summary>
        /// 状态信息
        /// </summary>
        public String msg { get; set; } = "失败";
 
        /// <summary>
        /// 数据详情
        /// </summary>
        public string data { get; set; }
 
        /// <summary>
        /// 数据总条数
        /// </summary>
        public int count { get; set; } = 0;
    }
}