"# JsonNet.NullValueResolver"
1.字段为NULL的值，在序列化时，直接序列化为NULL值
2.对象、对象数组为NULL时
3.日期转时间戳处理
这些问题都容易引起APP端的崩溃
1.字符串为NULL时，返回：""
2.对象为NULL时，返回：{}
3.对象数组为NULL时，返回：[]
JsonNet.NullValueResolver就是为解决这些问题而来。
/// <summary>
/// 测试类
/// </summary>
public class ResponseModel
{
public bool IsSuccess { get; set; }
public object Entity { get; set; }
[JsonConverter(typeof(UnixTimeStampDateTimeConverter))]
public DateTime TestDate { get; set; }
public DateTime? NullableDate { get; set; }
public bool? NullableBool { get; set; }
public Guid? NullableGuid { get; set; }
}
JsonConvert.DefaultSettings = (() =>
{
var settings = new JsonSerializerSettings();
settings.ContractResolver = new NullValueResolver();
return settings;
});
其它操作不变，这样在序列化时，将能够自动处理NULL值这些问题，开发过程中，经常还会遇到要传时间戳的问题，比如给APP端传时间时传时间戳，APP端给Server端传数据时也要传时间戳，这个例子里也有写，可以很方便的进行自由转换。
static void Main(string[] args)
{
var responseModel = new[] { new ResponseModel() };
responseModel[0].IsSuccess = true;
//Entity --> null
responseModel[0].Entity = null;
// JsonNet Configuration
JsonConvert.DefaultSettings = (() =>
{
var settings = new JsonSerializerSettings();
settings.ContractResolver = new NullValueResolver();
return settings;
});
Console.WriteLine("Before Serialize：");
Console.Write("TestDate:");
responseModel[0].TestDate = DateTime.Now;
Console.WriteLine(responseModel[0].TestDate);
Console.WriteLine("----------------------------");
//serialize object to json
var jsonResult = JsonConvert.SerializeObject(responseModel);
Console.WriteLine(jsonResult);
Console.WriteLine("----------------------------");
//deserialize json string to object
var inputJsonResult = JsonConvert.DeserializeAnonymousType(jsonResult, responseModel);
Console.WriteLine("After Deserialized：");
Console.Write("TestDate:");
Console.WriteLine(inputJsonResult[0].TestDate);
Console.ReadLine();
}
Before Serialize：
TestDate:2016/7/3 20:17:41
----------------------------
[{"IsSuccess":true,"Entity":{},"TestDate":"1467548261","NullableDate":"0001-01-01T00:00:00","NullableBool":false,"NullableGuid":"00000000-0000-0000-0000-000000000000"}]
----------------------------
After Deserialized：
TestDate:2016/7/3 20:17:41