解决：MVC对象转json包含\r \n

项目中对象转json字符串时，如下：
JsonSerializerSettings jsetting = new JsonSerializerSettings();
jsetting.DefaultValueHandling = DefaultValueHandling.Ignore;
return JsonConvert.SerializeObject(resultMoldels, Formatting.Indented, jsetting);
发现返回的字符串中包含换行符 \r\n

"{\r\n \"result\": true,\r\n \"msg\": \"OK\",\r\n \"data\": [\r\n \"success\",\r\n \"123456789\",\r\n \"987654321\"\r\n ]\r\n}"

解决方法：
Formatting.Indented 修改成 Formatting.None