.Net Core 3.0 TimeSpan deserialization error - Fixed in .Net 5.0

Question

I am using .Net Core 3.0 and have the following string which I need to deserialize with Newtonsoft.Json:

{
    \"userId\": null,
    \"accessToken\": null,
    \         


        

Answer 1

My solution is to use custom converter, but with explicitly specified standard non culture-sensitive TimeSpan format specifier .

public class JsonTimeSpanConverter : JsonConverter
{
    public override TimeSpan Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        return TimeSpan.ParseExact(reader.GetString(), "c", CultureInfo.InvariantCulture);
    }

    public override void Write(Utf8JsonWriter writer, TimeSpan value, JsonSerializerOptions options)
    {
        writer.WriteStringValue(value.ToString("c", CultureInfo.InvariantCulture));
    }
}

Then register it in the Startup for the HostBuilder:

public class Startup
{
    public IServiceProvider ConfigureServices(IServiceCollection services)
    {
        ...
        services
            ...
            .AddJsonOptions(opts =>
            {
                opts.JsonSerializerOptions.Converters.Add(new JsonTimeSpanConverter());                    
            });
        ...
    }
}