C# .NET - Access to an instance of attribute filter-CodePudding

I have following filter:

public class UserAuthFilter : ActionFilterAttribute, IActionFilter
{
   public bool AllowAnonymous { get; set; } = false;
   public string Name { get; set; };
   
   public UserAuthFilter(bool allowAnonymous = false, string name = "") 
   {
      this.AllowAnonymous = allowAnonymous;
      this.Name = name;
   }
 
   public async override Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
   {
        // some actions
        await next();
   }

}

and I apply this filter on a controller's method like this:

[HttpPost]
[UserAuthFilter]
public async Task<IActionResult> Create(CreateDataRequest request)
{
    //
    // here I would like to have an instance of the applying UserAuthFilter
    //
    return service.Create(request);
}

Is it possible to obtain the instance of the applied filter on the commented place?

Thank you very much

I tried to set the attributes as static variables and than access these attributes staticaly like UserAuthFilter.AllowAnonymous, but this approach not seems to be okay.

CodePudding user response：

Sure, you can modify the items/properties bag of the HTTP request, as such:

public async override Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
{
  // some actions
  context.HttpContext.Items["UserAuthFilter"] = this;
  await next();
}

accessed as such:

[HttpPost]
[UserAuthFilter]
public async Task<IActionResult> Create(CreateDataRequest request)
{
  var filter = HttpContext.Items["UserAuthFilter"] as UserAuthFilter;
  return service.Create(request);
}