Get list of custom attributes for current action/controller in ASP.NET MVC

David_Thomas_Garcia_40161 0
Viewed 24745

Checking out the sample code from http://lukesampson.com/post/471548689/entering-and-exiting-https-with-asp-net-mvc written for ASP.NET MVC2, I noticed they can check if a custom attribute is applied to the current action or controller by accessing filterContext.ActionDescriptor and filterContext.ActionDescriptor.ControllerDescriptor respectively:

public class ExitHttpsIfNotRequiredAttribute : FilterAttribute, IAuthorizationFilter {
    public void OnAuthorization(AuthorizationContext filterContext) {
        // snip

        // abort if a [RequireHttps] attribute is applied to controller or action
        if(filterContext.ActionDescriptor.ControllerDescriptor.GetCustomAttributes(typeof(RequireHttpsAttribute), true).Length > 0) return;
        if(filterContext.ActionDescriptor.GetCustomAttributes(typeof(RequireHttpsAttribute), true).Length > 0) return;

        // snip
    }
}

What would be the ASP.NET MVC 1 method of checking the action and controller for a custom attribute? In ASP.NET MVC 1 there is no filterContext.ActionDescriptor that I can tell.

authorize-attribute custom-attributes asp.net-mvc
5 Answers

this worked for me in .NET Core 2.2:

var controllerActionDescriptor = actionContext.ActionDescriptor as ControllerActionDescriptor;

if (controllerActionDescriptor != null)
{
    // Check if the attribute exists on the action method
    if (controllerActionDescriptor.MethodInfo?.GetCustomAttributes(inherit: true)?.Any(a => a.GetType().Equals(typeof(CustomAttribute))) ?? false)
        return true;

    // Check if the attribute exists on the controller
    if (controllerActionDescriptor.ControllerTypeInfo?.GetCustomAttributes(typeof(CustomAttribute), true)?.Any() ?? false)
        return true;
}
user_24025110

I'm using MVC5 and had to use the following to check from within a class that inherits from ActionFilterAttribute and implements IAuthenticationFilter.

If filterContext.ActionDescriptor.GetCustomAttributes(GetType(RequireHttpsAttribute), True).Any() OrElse filterContext.ActionDescriptor.ControllerDescriptor.GetCustomAttributes(GetType(RequireHttpsAttribute), True).Any() Then
' .. the given attribute is present ..
End If

I couldn't get Ruben's solution to work for me but it was probably because I messed up in the conversion from C# to VB.

user_24602940
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