1、呼叫webapi介面時，碰到一種情況：

通過webapi呼叫介面時，返回的json資料，死活轉換不成物件，轉換的物件一直為null；

webapi端程式碼：

[HttpGet]
public string GetResponse()
{
      WordResponse response = new WordResponse();
      response.Result = false;
      response.PageNum = 12;
      return JsonHelper.ToJson(response); 
}

    public static class JsonHelper
    {
        static readonly JavaScriptSerializer Serializer = new JavaScriptSerializer();

        /// <summary>
        /// 將一個物件轉換成json格式字串
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="t"></param>
        /// <returns></returns>
        public static string ToJson<T>(this T t)
        {
            return Serializer.Serialize(t);
        }

        /// <summary>
        /// 把物件轉換為JSON字串
        /// </summary>
        /// <param name="o">物件</param>
        /// <returns>JSON字串</returns>
        public static string ToJSON(this object o)
        {
            if (o == null)
            {
                return null;
            }
            return JsonConvert.SerializeObject(o);
        }
        /// <summary>
        /// 把Json文字轉為實體
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="input"></param>
        /// <returns></returns>
        public static T FromJSON<T>(this string input)
        {
            try
            {
                return JsonConvert.DeserializeObject<T>(input);
            }
            catch (Exception ex)
            {
                return default(T);
            }
        }
    }

接收端程式碼：

string serviceAddress = string.Format("http://192.168.168.152:9094/api/Word/GetResponse");
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(serviceAddress);
            request.Method = "GET";
            request.ContentType = "application/json;charset=UTF-8";
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
            string retString = myStreamReader.ReadToEnd();
            new SysLogInfoService().SysErrorLog("報告頁數", "報告頁數", retString);

            WordResponse wordResponse1 = JsonHelper.ToObject<WordResponse>(retString);

            WordResponse wordResponse = JsonTool.FromJSON<WordResponse>(retString);

最後發現，通過api返回json資料時，不要再轉換為json，否則返回的json中會多一些斜線/，導致轉換為物件失敗，所以物件為空。