格式化JSON字符串

    public static string FormatJsonString(string jsonString)
    {
        StringReader sr = new StringReader(jsonString);
        JsonReader reader = new JsonTextReader(sr);
        StringWriter sw = new StringWriter();

        using (JsonTextWriter writer = new JsonTextWriter(sw))
        {
            writer.Indentation = 2;  // the Indentation
            writer.Formatting = Newtonsoft.Json.Formatting.Indented;
            writer.WriteToken(reader);
            writer.Close();
        }

        string formattedJson = sw.ToString();
        sw.Close();
        return formattedJson;
    }