Part 4 - EnumerationToEnumSchemaFilter.cs

EnumerationToEnumSchemaFilter.cs

// Import Swashbuckle.AspNetCore.SwaggerGen

public class EnumerationToEnumSchemaFilter : ISchemaFilter
{
    public void Apply(OpenApiSchema schema, SchemaFilterContext context)
    {
        if (!context.Type.IsSubclassOf(typeof(Enumeration)))
        {
            return;
        }

        var fields = context.Type.GetFields(BindingFlags.Static | BindingFlags.Public);

        schema.Enum = fields.Select(field => new OpenApiString(field.Name)).Cast<IOpenApiAny>().ToList();
        schema.Type = "string";
        schema.Properties = null;
        schema.AllOf = null;
    }
}