In this recipe, you will learn how to use a filter globally, and understand the difference between using a filter globally and using middleware.
- First, let's create a
ResultFilterclass by deriving fromIResultFilter:
public class MyResultFilter : IResultFilter
{
public void OnResultExecuting(ActionExecutingContext context)
{
// do something before the action executes
}
public void OnResultExecuted(ActionExecutedContext context)
{
// do something after the action executes
ViewResult result = context.Result as ViewResult;
if (result != null)
{
result.ViewData["globalMessage"] =
"Comes from MyActionAttributeFilter at " +
DateTime.Now.ToLongTimeString();
}
}
}- Next, let's configure this filter to be used as a global filter in
Startup.cs. We can do this in two ways; by type, or by instance:
services.AddMVC(config =...