C#json反序列化 ：报错

/// <summary> 
/// JSON文本转对象,泛型方法 
/// </summary> 
/// <typeparam name="T">类型</typeparam> 
/// <param name="jsonText">JSON文本</param> 
/// <returns>指定类型的对象</returns> 
public static T JSONToObject<T>(string jsonText)
{
     JavaScriptSerializer jss = new JavaScriptSerializer();
     try
     {
          return jss.Deserialize<T>(jsonText);
     }
     catch (Exception ex)
     {
          throw new Exception("JSONHelper.JSONToObject(): " + ex.Message);
     }
}

class JsonResult
{
    public int status { get; set; }
    public string message { get; set; }
    public List<Result> results { get; set; }
}

class Result
{
    public int orderstatus { get; set; }
    public string orderid { get; set; }
    public string ordermsg { get; set; }
}


JsonResult res = JsonHelper.JSONToObject<JsonResult>(jsondata);
Console.WriteLine(res.results.Count);
//输出 2