.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

Not sure if it is the nullable TimeSpan that I am using, but even with .NET 5.0 I am still not able to deserialize a TimeSpan when using System.Text.Json.

In any case, here is a solution that I have used in several models for custom serialization. Note that the [NotMapped] attribute is only required if you are planning to use the class as a database model.

using System.Text.Json.Serialization;
using System.ComponentModel.DataAnnotations.Schema;

// Add your namespace and class declarations

[JsonIgnore]
public TimeSpan? MyTimeSpan { get; set; }

[NotMapped]
public long MyTimeSpanSerializer
{
    get => MyTimeSpan?.Ticks ?? -1;
    set => MyTimeSpan = value >= 0 ? new TimeSpan(value) : (TimeSpan?)null;
}