使用 JSON.NET 实现自定义日期时间转换器

Question

使用

日期时间转换器时，我在解析以下 JSON 时遇到问题。 我知道"-"和"at"会导致问题，但这是我在响应中的 JSON，无法控制它。

"[{"Desc":"Unacceptable Signal","Station":"Test","When":"Tuesday - 5/18/10 at 3:34 PM"},{"Desc":"Low Battery","Station":"Test Unit (21261)","When":"Wednesday - 3/30/11 at 12:34 AM"}]"

我的模型是：

public class CurrentAlarms
    {
        public string Desc { get; set; }
        public string Station { get; set; }
        public DateTime When { get; set; }
        public CurrentAlarms() { }
        public CurrentAlarms(string desc, string station, DateTime when)
        {
            Desc = desc;
            Station = station;
            When = when;
        }
    }

我已经尝试反序列化它，如下所示，即使删除日期时间字符串中的"at"，但我仍然从 JSON.NET 中得到"字符串格式不正确"异常。我很难找到其他解决方法。 任何帮助将不胜感激！

json = json.Replace(" at ", " ");
var format = "dddd MM/dd/yy h:mm tt";
var dateTimeConverter = new IsoDateTimeConverter {DateTimeFormat = format};
var result = JsonConvert.DeserializeObject<ObservableCollection<CurrentAlarms>>(json, dateTimeConverter);

Answer 1

public class CurrentAlarms
{
    public string Desc { get; set; }
    public string Station { get; set; }
    [JsonConverter(typeof(InvalidDataFormatJsonConverter))]
    public DateTime When { get; set; }
    public CurrentAlarms() { }
    public CurrentAlarms(string desc, string station, DateTime when)
    {
        Desc = desc;
        Station = station;
        When = when;
    }
}
class InvalidDataFormatJsonConverter : JsonConverter
{
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        // implement in case you're serializing it back
    }
    public override object ReadJson(JsonReader reader, Type objectType, object existingValue,
        JsonSerializer serializer)
    {
        var dataString = (string) reader.Value;
        DateTime date = parseDataString;             
        return date;
    }
    public override bool CanConvert(Type objectType)
    {
        return true;
    }
}

尝试在 ReadJson 上调试它并在那里解析日期 - 现在应该更容易了。