C#读取json文件，返回字符串

        public  string Readjson()
        {
            string path = Path.GetFullPath("../../..") + "\\Json\\BS002.json";//JSON文件路径

            StreamReader sr = new StreamReader(path, Encoding.Default);
            string line;
            string jsonobj = "";
            while ((line = sr.ReadLine()) != null)
            {
                jsonobj = jsonobj + line.ToString();
            }
            return jsonobj;
        }