I want to support deserializing more than one custom DateTime format with the Newtonsoft Json deserializer, so I am using IsoDateTimeConverter
:
var serializeSettings = new JsonSerializerSettings();
serializeSettings.Converters.Add(new IsoDateTimeConverter() { DateTimeFormat = "yyyyMMddTHHmmssZ" });
As the DateTimeFormat
property does not accept an array of formats, I tried the following to support multiple custom date formats:
var serializeSettings = new JsonSerializerSettings();
serializeSettings.Converters.Add(new IsoDateTimeConverter() { DateTimeFormat = "yyyyMMddTHHmmssZ" });
serializeSettings.Converters.Add(new IsoDateTimeConverter() { DateTimeFormat = "yyyy-MM-ddTHH:mm" });
However the above code's result is supporting deserializing only the first format.
How can I achieve supporting multiple custom DateTime formats?
If you want to handle multiple possible date formats, you will need to make a custom JsonConverter
which can accept multiple format strings and try them all until one succeeds. Here is a simple example:
class MultiFormatDateConverter : JsonConverter
{
public List<string> DateTimeFormats { get; set; }
public override bool CanConvert(Type objectType)
{
return objectType == typeof(DateTime) || objectType == typeof(DateTime?);
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
string dateString = (string)reader.Value;
if (dateString == null)
{
if (objectType == typeof(DateTime?))
return null;
throw new JsonException("Unable to parse null as a date.");
}
DateTime date;
foreach (string format in DateTimeFormats)
{
// adjust this as necessary to fit your needs
if (DateTime.TryParseExact(dateString, format, CultureInfo.InvariantCulture, DateTimeStyles.None, out date))
return date;
}
throw new JsonException("Unable to parse \"" + dateString + "\" as a date.");
}
public override bool CanWrite
{
get { return false; }
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
throw new NotImplementedException();
}
}
Then you can add it to your settings like this:
var settings = new JsonSerializerSettings();
settings.DateParseHandling = DateParseHandling.None;
settings.Converters.Add(new MultiFormatDateConverter
{
DateTimeFormats = new List<string> { "yyyyMMddTHHmmssZ", "yyyy-MM-ddTHH:mm" }
});
Fiddle: https://dotnetfiddle.net/vOpMEY