EnumConverterFactory.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.Text.Json.Serialization.Converters;
 
internal sealed class EnumConverterFactory : JsonConverterFactory
{
    public override bool CanConvert(Type type)
    {
        return type.IsEnum;
    }
 
    public override JsonConverter CreateConverter(Type type, JsonSerializerOptions options)
    {
        return Create(type, EnumConverterOptions.AllowNumbers, options);
    }
 
    internal static JsonConverter Create(Type enumType, EnumConverterOptions converterOptions, JsonSerializerOptions serializerOptions)
    {
        return (JsonConverter)Activator.CreateInstance(GetEnumConverterType(enumType), converterOptions, serializerOptions);
    }
 
    internal static JsonConverter Create(Type enumType, EnumConverterOptions converterOptions, JsonNamingPolicy namingPolicy, JsonSerializerOptions serializerOptions)
    {
        return (JsonConverter)Activator.CreateInstance(GetEnumConverterType(enumType), converterOptions, namingPolicy, serializerOptions);
    }
 
    [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2055:MakeGenericType", Justification = "'EnumConverter<T> where T : struct' implies 'T : new()', so the trimmer is warning calling MakeGenericType here because enumType's constructors are not annotated. But EnumConverter doesn't call new T(), so this is safe.")]
    [return: DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
    private static Type GetEnumConverterType(Type enumType)
    {
        return typeof(EnumConverter<>).MakeGenericType(enumType);
    }
}