How to get ASP.NET Core MVC Filters from HttpContext

Question

I'm trying to write some middleware and need to know if the current action method (if any) has a particular filter attribute, so I can change behaviour based it's existence.

So is it possible to get a filters collection of type IList<IFilterMetadata> like you do on the ResourceExecutingContext when you are implementing an IResourceFilter?

Answer 1

It's not really possible today.

It is possible in ASP.NET Core 3.0

app.UseRouting();


app.Use(async (context, next) =>
{
    Endpoint endpoint = context.GetEndpoint();

    YourFilterAttribute filter = endpoint.Metadata.GetMetadata<YourFilterAttribute>();

    if (filter != null)
    { 

    }

    await next();
});


app.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();
});