An easy and convenient way to hide action method conditionally in ASP.NET Core

user_1752270 0
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I'm looking for easy and convenient way to hide action methods in controllers in ASP.NET Core.
For some reason it's hard to find a complete and satisfactory answer.

For example, I want to hide specific action method in a specific controller for a given environment value (i.e. IWebHostEnvironment.EnvironmentName != Development).

I know about ServiceFilterAttribute, but this is the way to prevent execution of a method, and I prefer removing the action method completely from everywhere (as I said, conditionally), including generated swagger schemas. Something like NonAction attribute, but working with a runtime condition. Still, if possible, I prefer using custom Attribute to decorate an action method.

Does anyone know any convenient ways to implement such behavior?

asp.net-core .net-core c#
1 Answers

I think you should be able to do it with creating a custom IApplicationModelConvention

public class RemoveActionConvention : IApplicationModelConvention
{
    public void Apply(ApplicationModel application)
    {
        foreach (var controller in application.Controllers)
        {
            var toBeRemoved = new List<ActionModel>();
            foreach (var action in controller.Actions)
            {
                if (ShouldBeRemoved(action))
                {
                    toBeRemoved.Add(action);
                }
            }

            foreach (var action in toBeRemoved)
            {
                controller.Actions.Remove(action);
            }
        }
    }
}

And add it to MVC conventions

services.AddMvc(options =>
{
    options.Conventions.Add(new RemoveActionConvention());
});
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