The Basic Principles Of filters in asp.net mvc

The Basic Principles Of filters in asp.net mvc

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During the OnResourceExecuted technique, if the current ask for’s essential isn’t by now in use, The present Result is saved from the cache, to be used by potential requests.

Also, TypeFilterAttribute can optionally take constructor arguments for the kind in issue. The next instance demonstrates the best way to pass arguments to a type using TypeFilterAttribute:

The sort of consequence currently being executed is dependent upon the action in dilemma. An MVC motion returning a see would come with all razor processing as Component of the ViewResult becoming executed. An API technique may well accomplish some serialization as part of the execution of The end result. Learn more about motion final results

One particular example in which you might want a distinct kind of mistake handling for different actions could be in an app that exposes both of those API endpoints and steps that return views/HTML. The API endpoints could return error details as JSON, whilst the see-primarily based steps could return an mistake website page as HTML.

Let’s determine a dictionary object _cache for holding the cached benefit and also a string worth _cacheKey for storing the Cache crucial:

End result filters can operate code right away before and following the execution of unique motion outcomes. They run only when the action strategy has executed properly. 

Creating and Returning ViewResult: A new ViewResult is established to return precisely the same look at Along with the invalid model information. This ViewResult includes the name from the action (retrieved from context.

Location ResultExecutedContext.Exception to null proficiently ‘handles’ an exception and can prevent the exeception from becoming rethrown by MVC later inside the pipeline. If dealing with an exception in a final result filter, think about whether or not it’s acceptable to write down any data for the reaction. When the motion consequence throws partway by way of its execution, as well as the headers have now been flushed to the consumer, there’s no dependable system to send out a failure code.

Move six − To add a controller, correct-click the controller folder in the solution explorer and select Increase → Controller.

Characteristics enable filters to simply accept arguments, as shown in the example above. You should incorporate this attribute to some controller or motion method and specify the name and price of the HTTP header you wished to add towards the response:

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Authorization Filters: Authorization filters are executed initial. They can be chargeable for examining whether or not The present consumer can access the asked for useful resource filters in asp.net mvc or action. If authorization fails, the request will probably be small-circuited, plus the motion approach won't be executed.

Logging the Exception: When an exception takes place in almost any motion technique to which this filter is utilized, the OnException strategy captures the exception and logs an in depth information.

If you might want to incorporate headers to the response, do this before the action result executes. Otherwise, the response may possibly are sent for the client, and it will be far too late to switch it. For any result filter, this means including the header in OnResultExecuting rather then OnResultExecuted.