What is filter in mvc application and custom filter?

Sometimes you want to perform logic either before an action method is called or after an action method runs. To support this, ASP.NET MVC provides filters. Filters are custom classes that provide both a declarative and programmatic means to add pre-action and post-action behavior to controller action methods.

https://msdn.microsoft.com/en-us/library/gg416513(VS.98).aspx

There are 5 filters available in ASP.Net MVC.

Authentication Filter
Authorization Filter
Action Filter
Result Filter
Exception Filter

Regarding custom filter, the above all are customize one. that is you can customize the above based on your need.

Hope this helps!

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Francis Susaimichael8y ago
Accepted answer
Sometimes you want to perform logic either before an action method is called or after an action method runs. To support this, ASP.NET MVC provides filters. Filters are custom classes that provide both a declarative and programmatic means to add pre-action and post-action behavior to controller action methods.

https://msdn.microsoft.com/en-us/library/gg416513(VS.98).aspx

There are 5 filters available in ASP.Net MVC.
Authentication Filter
Authorization Filter
Action Filter
Result Filter
Exception Filter
Regarding custom filter, the above all are customize one. that is you can customize the above based on your need.

Hope this helps!