System.Text.Json: How to convert from "true" to boolean

Question

If I receive JSON which is beyond my control, which has a property as follows.

{"allow":"true"}

and I want that to map to a bool property in C#.

I saw that I can do similar for numbers using the attribute

[JsonNumberHandling(JsonNumberHandling.AllowReadingFromString)]

but how can I do that for booleans?

Edit:

I am not sure why this is closed because of a duplicate question, since the other question focuses on converting from ints to bools

Answer 1

Ok, it seems like this functionality is not built in but is easy to implement. https://github.com/dotnet/runtime/issues/43587#issuecomment-780031498

Would have to create a custom converter as follows (taken from the link).

public class BooleanConverter : JsonConverter<bool>
{
    public override bool Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        switch (reader.TokenType)
        {
            case JsonTokenType.True:
                return true;
            case JsonTokenType.False:
                return false;
            case JsonTokenType.String:
                return reader.GetString() switch
                {
                    "true" => true,
                    "false" => false,
                    _ => throw new JsonException()
                };
            default:
                throw new JsonException();
        }
    }

    public override void Write(Utf8JsonWriter writer, bool value, JsonSerializerOptions options)
    {
        writer.WriteBooleanValue(value);
    }
}