The Definitive Guide to filters in asp.net mvc

The Definitive Guide to filters in asp.net mvc

Blog Article

An motion filter is really an attribute. It is possible to use most motion filters to both an individual controller action or an entire controller.

The OnResultExecuting method runs prior to the action result's executed, so it can manipulate the motion result by way of ResultExecutingContext.Result. An OnResultExecuting approach can limited-circuit execution of the motion final result and subsequent result filters by placing ResultExecutingContext.

Exception is set to a non-null value In case the motion or a subsequent action filter threw an exception. Location Exception to null: Efficiently handles an exception.

A single illustration where you may well need to have a unique sort of mistake dealing with for different actions could be in an application that exposes both of those API endpoints and steps that return views/HTML. The API endpoints could return error info as JSON, whilst the see-primarily based actions could return an mistake page as HTML.

In Asp.Net Core, the filters are sometimes facet into the pipeline at a single in just about every of a few different scopes

Forms that happen to be referenced using the TypeFilterAttribute need not be registered While using the DI container. They do have their dependencies fulfilled from the DI container.

Lastly, you realized how to carry out a simple action filter. We developed a Log motion filter that logs the levels of processing a controller motion to the Visual Studio Output window.

Placing ResultExecutedContext.Exception to null efficiently ‘handles’ an exception and will reduce the exeception from being rethrown by MVC afterwards inside the pipeline. If dealing with filters in asp.net mvc an exception in a end result filter, look at whether or not it’s correct to write any data towards the response. If the action end result throws partway as a result of its execution, along with the headers have already been flushed to your shopper, there’s no responsible system to mail a failure code.

For my tests, I’m making use of xUnit, which includes the ability to run numerous assessments with diverse details sets to get a given exam method.

Such as, the Data controller in Listing 1 exposes an action named Index() that returns The existing time. This action is decorated Together with the OutputCache action filter. This filter triggers the value returned through the motion to generally be cached for 10 seconds.

This action necessitates the Create authorization which isn't readily available for the user and consequently it throws an HTTP ERROR 401 denoting an unauthorized ask for.

Upcoming, generate An additional course file named LoggerService.cs inside the Products folder and duplicate and paste the following code. This course implements the ILoggerService interface and implements the Log technique, where by We now have created the logic to retail store the log concept inside of a text file.

Consequence filters are certainly not executed when exception filters tackle an exception, unless the exception filter sets Exception = null.

You'll be able to carry out IFilterFactory all on your own attribute implementations as A further approach to producing filters: