C#按需序列化对象为Json字符串

class Program
{
static void Main(string[] args)
{
Staff s = new Staff("10000", "11111", "22222");
IList<Staff> list = new List<Staff> { s,s };

JsonHelper.ToJsonString<Staff>(list, o=>string.Format("{{firstname:{0}}}", o.FirstName));
JsonHelper.ToJsonString<Staff>(s, o=>string.Format("{{firstname:{0}, lastname:{1}}}", o.FirstName, o.LastName));

Console.ReadLine();
}
}