C# 将字符串转换成Json格式显示

        /// 

        /// 将字符串转换成Json格式显示
        /// 
        /// 
        /// 
        private string ConvertJsonString(string str)
        {
            JsonSerializer serializer = new JsonSerializer();
            TextReader textReader = new StringReader(str);
            JsonTextReader reader = new JsonTextReader(textReader);
            var obj = serializer.Deserialize(reader);
            if (obj != null)
            {
                StringWriter textWriter = new StringWriter();
                JsonTextWriter jsonWriter = new JsonTextWriter(textWriter)
                {
                    Formatting = Formatting.Indented,
                    Indentation = 4,
                    IndentChar = ' '
                };
                serializer.Serialize(jsonWriter, obj);
                return textWriter.ToString();
            }
            else
            {
                return str;
            }
        }