System.Text.Json

_system_text_Json.md

System.Text.Json

• Custom DateTime Converter

custom_date_time_converter.md

Custom DateTime Converter

1. Create the converter

public class DateTimeConverter : JsonConverter<DateTime>
{
    public override DateTime Read(
        ref Utf8JsonReader reader, 
        Type typeToConvert, 
        JsonSerializerOptions options)
    {
        return DateTime.ParseExact(
            reader.GetString(),
            "yyyy-MM-dd HH:mm:ss.fff",
            CultureInfo.InvariantCulture);
    }

    public override void Write(
        Utf8JsonWriter writer, 
        DateTime value, 
        JsonSerializerOptions options)
    {
        writer.WriteStringValue(
            value.ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture));
    }
}

2. Add the converter to the JsonSerializerOptions's converters list

var options = new JsonSerializerOptions();
options.Converters.Add(new DateTimeConverter());

var result = await response.Content.ReadFromJsonAsync<SomeDto>(options);

Links

• How to write custom converters for JSON serialization (marshalling) in .NET