What Does filters in asp.net mvc Mean?
What Does filters in asp.net mvc Mean?
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Overuse of filters may well increase the probability of lower in effectiveness and can also produce assault floor.
Useful resource filters are Specially handy if you must short-circuit most of the get the job done a request is accomplishing. Caching would be just one instance use case for a source filter, given that if the response is now inside the cache, the filter can straight away set a outcome and prevent the remainder of the processing with the action.
The kind of final result currently being executed will depend on the action in query. An MVC motion returning a look at would include all razor processing as Section of the ViewResult currently being executed. An API system may accomplish some serialization as A part of the execution of The end result. Find out more about motion results
If we wish to execute the filter code instantly While using the controller action technique, we need to use the Motion filters. We can easily utilize the motion filter prior to or after the execution of any controller motion method.
Eventually, Enable’s generate an motion system while in the HomeController and apply the AddHeader end result filter attribute.
Setting the Reaction: Soon after logging the exception, the tactic proceeds to alter the person’s working experience by redirecting them to a generic error page. This is certainly completed by location context.Result to a different ViewResult:
To understand the filter in detail, let's acquire an example of a designed-in Exception filter. Exception filter executes when an unhandled exception takes place within your software.
If a cached final result exists (cachedResult), it is immediately assigned to context.Consequence. This tells the framework to skip executing the action system and return the cached outcome on to the client.
Must not log actions or other framework gatherings. The built-in filters by now log steps and framework events.
Resource filters appear correct once the authorization. We will utilize it to put into action caching or short-circuit the filter pipeline for general performance motives.
Middleware filters operate at the exact same phase with the filter pipeline as Useful resource filters, before model binding and following the rest of the pipeline.
The house controller in Listing filters in asp.net mvc 3 illustrates how you can apply the Log action filter to a whole controller class.
Logging the Exception: When an exception happens in almost any motion method to which this filter is applied, the OnException strategy captures the exception and logs an in depth information.
If you have to incorporate headers into the reaction, do so before the motion end result executes. If not, the response could are actually despatched to the shopper, and it will be as well late to modify it. For your consequence filter, this means introducing the header in OnResultExecuting rather than OnResultExecuted.