WebApi返回json

Api

        [HttpPost]
        public object ReceiveFile()
        {
            string json = DisptcherHelper.Instance.Start();
            return new HttpResponseMessage { Content = new StringContent(json, Encoding.GetEncoding("UTF-8"), "application/json") };
        }

接收到字符串：

"{"result":false,"code":"","msg":"缺少机构参数，请检查输入","data":null}"

转换成Json：

                var json = eval('(' + data + ')');
                console.log(JSON.stringify(json));

转换成Json后输出：

{"result":false,"code":"","msg":"缺少机构参数，请检查输入","data":null}