如何转换新的日期(年,月,日)重载与JSON.Net
本文关键字:重载 Net JSON 日期 何转换 转换 | 更新日期: 2023-09-27 18:04:04
我正在尝试解析JSON文件,其中日期被定义为JavaScript对象:
new Date(year, month[, day[, hour[, minutes[, seconds[, milliseconds]]]]]);
所以我尝试用JavaScriptDateTimeConverter
解析它test.json:
{"data" : [{"Date" : new Date(2015, 06, 01, 00, 00, 00)}]}
c#: using (StreamReader file = File.OpenText(@"c:'test.json"))
{
JsonSerializer serializer = new JsonSerializer();
serializer.Converters.Add(new JavaScriptDateTimeConverter());
Rootobject deserializedRoot = (Rootobject)serializer.Deserialize(file, typeof(Rootobject));
}
不幸的是,我收到这个错误:
意外的令牌解析日期。预期的EndConstructor,得到Integer。路径的数据[0]。日期1',第13行,位置30.
从我对JSON的理解。Net期望最多一个new Date(52231943)
,但不处理Javascript Date()对象的构造函数重载。
是否有已知的方法来转换new Date(year, month, day)
?
您可以创建自己的JavaScriptDateTimeConverter.cs
子类,如下所示:
public class JavaScriptYMDDateTimeConverter : JavaScriptDateTimeConverter
{
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
Type type = (Nullable.GetUnderlyingType(objectType) ?? objectType);
bool isNullable = (Nullable.GetUnderlyingType(objectType) != null);
var token = JToken.Load(reader);
if (token == null || token.Type == JTokenType.Null)
{
if (!isNullable)
throw new JsonSerializationException(string.Format("Null value for type {0} at path {1}", objectType.Name, reader.Path));
return null;
}
if (token.Type != JTokenType.Constructor)
{
throw new JsonSerializationException(string.Format("Invalid Date constructor '"{0}'" at path {1}", token.ToString(), reader.Path));
}
var constructor = (JConstructor)token;
if (!string.Equals(constructor.Name, "Date", StringComparison.Ordinal))
{
throw new JsonSerializationException(string.Format("Invalid Date constructor '"{0}'" at path {1}", token.ToString(), reader.Path));
}
var values = constructor.Values().ToArray();
if (values.Length == 0)
{
throw new JsonSerializationException(string.Format("Invalid Date constructor '"{0}'" at path {1}", token.ToString(), reader.Path));
}
else if (values.Length == 1)
{
// Assume ticks
using (var subReader = constructor.CreateReader())
{
while (subReader.TokenType != JsonToken.StartConstructor)
subReader.Read();
return base.ReadJson(subReader, objectType, existingValue, serializer); // Use base class to convert
}
}
else
{
var year = (values.Length > 0 ? (int)values[0] : 0);
var month = (values.Length > 1 ? (int)values[1] : 0) + 1; // c# months go from 1 to 12, JavaScript from 0 to 11
var day = (values.Length > 2 ? (int)values[2] : 0);
var hour = (values.Length > 3 ? (int)values[3] : 0);
var min = (values.Length > 4 ? (int)values[4] : 0);
var sec = (values.Length > 5 ? (int)values[5] : 0);
var ms = (values.Length > 6 ? (int)values[6] : 0);
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date
// Note: Where Date is called as a constructor with more than one argument, the specifed arguments represent local time.
var dt = new DateTime(year, month, day, hour, min, sec, ms, DateTimeKind.Local);
if (type == typeof(DateTimeOffset))
return new DateTimeOffset(dt);
return dt;
}
}
}
这里ReadJson()
将令牌加载到JConstructor
中,检查构造函数名称是否为Date
,然后解析子函数。
注意,我没有重写WriteJson
,所以这个转换器将以与JavaScriptDateTimeConverter
相同的风格编写,其中刻度作为构造函数的单个参数出现。
用它代替JavaScriptDateTimeConverter()