OnActionExecuting

OnActionExecuting is a method in the ASP.NET MVC framework that is part of the Controller class. It is an action filter that is invoked before an action method executes. This method allows developers to perform custom logic before the action method is called, such as logging, validation, or modifying the request data. OnActionExecuting is part of the action filter pipeline, which includes other methods like OnActionExecuted, OnResultExecuting, and OnResultExecuted. These methods provide a way to inject behavior into the request processing pipeline at various stages. OnActionExecuting takes an ActionExecutingContext parameter, which provides information about the action that is about to be executed, including the action descriptor, the controller context, and the result. Developers can use this information to make decisions about whether to proceed with the action execution or to short-circuit the pipeline and return a different result. OnActionExecuting is a powerful tool for customizing the behavior of ASP.NET MVC applications, but it should be used judiciously to avoid introducing unnecessary complexity or performance overhead.