C#•3w ago

✅ How is JsonConverter(typeof(JsonStringEnumConverter<MyEnum>)) evaluated?

Hello, This makes it possible that enum is serialized to string when the request comes in. Is this evaluated on each request, or only once at compile time?

c#
[JsonConverter(typeof(JsonStringEnumConverter<Precipitation>))]
public enum Precipitation
{
    Drizzle, Rain, Sleet, Hail, Snow
}

c#
[JsonConverter(typeof(JsonStringEnumConverter<Precipitation>))]
public enum Precipitation
{
    Drizzle, Rain, Sleet, Hail, Snow
}

4 Replies

Pobiega•3w ago

happens at runtime, but if using source generation with STJ, it will, as the name implies, source generate the actual glue-code to call the converter

CoreOP•3w ago

there is one problem with that, I configured the source generation after the docs. But now the serialization only works with those classes, any other DTO, even the ones not using enums will throw an exteption. This means that for every new DTO 2 more classes must be added to the serializer, this is really inconvenient. Or I might be doing something wrong

c#
[JsonSourceGenerationOptions(UseStringEnumConverter = true)]
[JsonSerializable(typeof(ListLinksRequest))]
[JsonSerializable(typeof(ListLinksResult))]
public partial class EnumJsonSerializer : JsonSerializerContext;

c#
[JsonSourceGenerationOptions(UseStringEnumConverter = true)]
[JsonSerializable(typeof(ListLinksRequest))]
[JsonSerializable(typeof(ListLinksResult))]
public partial class EnumJsonSerializer : JsonSerializerContext;

Program.cs

c#
c.Serializer.Options.TypeInfoResolver = JsonTypeInfoResolver.Combine(EnumJsonSerializer.Default);

c#
c.Serializer.Options.TypeInfoResolver = JsonTypeInfoResolver.Combine(EnumJsonSerializer.Default);

I think this way the default serializer gets overridden, is there a way I could specify the default JsonTypeInfoResolver for the Combine() method? This seemed to work

c.Serializer.Options.TypeInfoResolver =
            JsonTypeInfoResolver.Combine(c.Serializer.Options.TypeInfoResolver, EnumJsonSerializer.Default);

c.Serializer.Options.TypeInfoResolver =
            JsonTypeInfoResolver.Combine(c.Serializer.Options.TypeInfoResolver, EnumJsonSerializer.Default);

Pobiega•3w ago

could you try appending to the chain instead? options.TypeInfoResolverChain.Add(YourSerializer.Default); seems cleaner to me

CoreOP•3w ago

This guy serializes 😄 Thank you so much

Gaming

Programming

✅ How is JsonConverter(typeof(JsonStringEnumConverter<MyEnum>)) evaluated?