How to override the SerializeDateTime method of c# javascriptserializer class?

Question

SerializeDateTime method returns datetime in milliseconds. I want him to turn to microseconds. SerializeDateTime method as follows:

private static void SerializeDateTime(DateTime datetime, StringBuilder sb, JavaScriptSerializer.SerializationFormat serializationFormat)
{
  if (serializationFormat == JavaScriptSerializer.SerializationFormat.JSON)
  {
    sb.Append("\"\\/Date(");
    sb.Append((datetime.ToUniversalTime().Ticks - JavaScriptSerializer.DatetimeMinTimeTicks) / 10000L);
    sb.Append(")\\/\"");
  }
  else
  {
    sb.Append("new Date(");
    sb.Append((datetime.ToUniversalTime().Ticks - JavaScriptSerializer.DatetimeMinTimeTicks) / 10000L);
    sb.Append(")");
  }
}

I want to override this method as follows.

private static void SerializeDateTime(DateTime datetime, StringBuilder sb, JavaScriptSerializer.SerializationFormat serializationFormat)
{
  if (serializationFormat == JavaScriptSerializer.SerializationFormat.JSON)
  {
    sb.Append("\"\\/Date(");
    sb.Append((datetime.ToUniversalTime().Ticks - JavaScriptSerializer.DatetimeMinTimeTicks));
    sb.Append(")\\/\"");
  }
  else
  {
    sb.Append("new Date(");
    sb.Append((datetime.ToUniversalTime().Ticks - JavaScriptSerializer.DatetimeMinTimeTicks));
    sb.Append(")");
  }
}

I do not know how to do it. How else can we come up with a solution? Newtonsoft serializer cannot serialize my model when I want to try. If it worked, maybe I could set it up with dateformat.

iSpain17 · Accepted Answer · 2019-07-04 12:46:29Z

0

The method in question is not marked as virtual. It cannot be overridden.

Why not just create your own method in a static class?

public static CustomSerializer
{
    public static void SerializeDateTime(...) {
         //your implementation
    }
}

answered Jul 4, 2019 at 12:46

iSpain17

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Comments

MPelletier · Accepted Answer · 2025-02-06 01:39:10Z

You could create a custom JavaScriptConverter and use that. The only downside is that the date will be wrapped.

public class JavaScriptDateTimeMicrosecondConverter : JavaScriptConverter
{
    private const string FieldName = "DateTimeInMicroSeconds";

    public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
    {
        if (dictionary == null) throw new ArgumentNullException(nameof(dictionary));

        if (serializer == null) throw new ArgumentNullException(nameof(serializer));

        if (dictionary.TryGetValue(FieldName, out var value))
        {
            return DateTime.Parse(value.ToString());
        }

        return null;
    }

    public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
    {
        DateTime datetime = (DateTime)obj;
        var result = new Dictionary<string, object>
        {
            { FieldName, (datetime.ToUniversalTime().Ticks - JavaScriptSerializer.DatetimeMinTimeTicks).ToString() }
        };

        return result;
    }

    public override IEnumerable<Type> SupportedTypes => new List<Type> { typeof(DateTime) };
}

// ...
// Registration
var jsSerializer = new JavascriptSerializer();
jsSerializer.RegisterConverters(new JavaScriptConverter[] { new JavaScriptDateTimeMicrosecondConverter() });

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