Exactly. I would expect an exception when giving a value that is not in the enum range,but in stead it is accepted as a “99”

You are most welcome, Imran. We have a lot of great articles here :). I hope you will enjoy reading those too. Thanks for your feedback.

Sorry, I’m not quite sure what you’re trying to achieve. You have a JSON string and you want it to deserialize back to enum but not getting expected result – is that what you mean?

Glad you find it useful :). Thanks for the feedback!

public enum MyNiceEnum
  {
    [Display(Name = “FirstValue”)]
    MyFirstValue = 0,

    [Display(Name = “Secondvalue”)]
    MySecondValue = 1
  }
and this converter is added :

 options.Converters.Add(new JsonStringEnumConverter(JsonNamingPolicy.CamelCase, false));

Thanks, Mike.

You can easily implement a custom policy with your desired logic:

public class CapitalCaseNamingPolicy : JsonNamingPolicy
  {
    public override string ConvertName(string name)
      => name?.ToUpperInvariant() ?? string.Empty;
  }

and pass it with the converter as usual:

var options = new JsonSerializerOptions();
        options.Converters.Add(new JsonStringEnumConverter(new CapitalCaseNamingPolicy()));


 var json = JsonSerializer.Serialize(new { BackColor = Color.DarkGray }, options);

Assert.Equal("{\"BackColor\":\"DARKGRAY\"}", json);