编程题：1. var person = '{name:"Lily",sex:"famale",age:24,country:"US"}';将person转换成JSON对象并便利每个属性值。

/// <summary>
/// Json工具类
/// </summary>
public class JsonUtility
{
private static JsonUtility _instance = new JsonUtility();

/// <summary>
/// 单例
/// </summary>
public static JsonUtility Instance
{
get { return _instance; }
set { _instance = value; }
}

/// <summary>
/// Json转对象
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="json"></param>
/// <returns></returns>
public T JsonToObject<T>(string json)
{
var ser = new DataContractJsonSerializer(typeof(T));
var ms = new MemoryStream(Encoding.UTF8.GetBytes(json));
var jsonObject = (T)ser.ReadObject(ms);
ms.Close();
return jsonObject;
}

/// <summary>
/// Json转对象列表
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="json"></param>
/// <returns></returns>
public IList<T> JsonToObjectList<T>(string json)
{
json = json.Replace("}]}", "");
var startIndex = json.IndexOf(":[{") + 3;
var newJson = json.Substring(startIndex);
var regex = new Regex("},{");
var jsons = regex.Split(newJson);

if (newJson.Contains("\":[]}"))
{
throw new Exception("快件单号没有找到");
}
var list = new List<T>();

foreach (var item in jsons)
{
var temp = "{" + item + "}";
list.Add(JsonToObject<T>(temp));
}
return list;
}

/// <summary>
/// 对象转Json
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public string ObjectToJson(object obj)
{
var serializer = new DataContractJsonSerializer(obj.GetType());
using (var ms = new MemoryStream())
{
serializer.WriteObject(ms, obj);
var sb = new StringBuilder();
sb.Append(Encoding.UTF8.GetString(ms.ToArray()));
return sb.ToString();
}
}

/// <summary>
/// 对象列表转Json
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="objectList"></param>
/// <returns></returns>
public string ObjectListToJson<T>(IList<T> objectList)
{
return ObjectListToJson(objectList, "");
}

/// <summary>
/// 对象列表转Json
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="objectList"></param>
/// <param name="className"></param>
/// <returns></returns>
public string ObjectListToJson<T>(IList<T> objectList, string className)
{
var sbResult = new StringBuilder();
sbResult.Append("{");
className = string.IsNullOrEmpty(className) ? objectList[0].GetType().Name : className;
sbResult.Append("\"" + className + "\":[");

for (var i = 0; i < objectList.Count; i++)
{
var item = objectList[i];
if (i > 0)
{
sbResult.Append(",");
}
sbResult.Append(ObjectToJson(item));
}

sbResult.Append("]}");
return sbResult.ToString();
}
}