How do I use authorization filters in C#?

How do I use authorization filters in C#?

Authorization filters in C# are used to enforce security policies on your application. You can create custom filters by inheriting from the AuthorizationFilterAttribute class.

Can you give me an example of a custom authorization filter?

Sure! Here's a simple example:

public class CustomAuthorizationFilter : AuthorizationFilterAttribute
{
    public override void OnAuthorization(AuthorizationFilterContext context)
    {
        if (!context.HttpContext.User.Identity.IsAuthenticated)
        {
            context.Result = new UnauthorizedResult();
        }
    }
}

How do I apply this filter to a controller?

You can apply the filter by decorating your controller or action method with the [ServiceFilter(typeof(CustomAuthorizationFilter))] attribute.

What if I want to apply it globally?

To apply it globally, you can register the filter in the ConfigureServices method in Startup.cs like this:

services.AddControllers(options =>
{
    options.Filters.Add<CustomAuthorizationFilter>();
});