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Showing content from https://github.com/dotnet/runtime/issues/79311 below:

Provide trim/AOT-safe mechanism to (de)serialize enums from strings with JSON source-gen · Issue #79311 · dotnet/runtime · GitHub

See #79311 (comment) for an updated API proposal.

The JsonStringEnumConverter class is a built-in JsonConverterFactory that is not compatible with NativeAOT, since it relies on Type.MakeGenericType() to work. We need to update the source generator so that it intercepts [JsonConverter(typeof(JsonStringEnumConverter))] annotations and replaces them with a NativeAOT-safe factory method invocation.

Should be addressed in conjunction with #81833.

namespace System.Text.Json.Serialization.Metadata;

public static class JsonMetadataServices
{
    public static JsonConverter<T> GetEnumConverter<T>(JsonSerializerOptions options) where T : struct, Enum
+   public static JsonConverter<T> GetStringEnumConverter<T>(JsonStringEnumConverter converterFactory, JsonSerializerOptions options) where T : struct, Enum
}

We could add the generic factory method on the converter factory itself:

public class JsonStringEnumConverter
{
    public JsonConverter CreateConverter(Type typeToConvert, JsonSerializerOptions options);
+   public JsonConverter<T> CreateConverter<T>(JsonSerializerOptions options) where T : struct, Enum
}

However I would prefer if this call were hidden behind the EditorBrowsable.Never JsonMetadataServices class.

Edited by @eiriktsarpalis

This issue focuses on a plan to support [JsonStringEnumConverter] (or an alternate approach), the primary scenario needed in 8.0 for the ASP.NET effort for AOT friendlinessfriendliness (JSON items tracked by #79122).

teo-tsirpanis, Sergio0694, cfbao and PaulusParssinen

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