Contents
How to convert a synchronous action method to an asynchronous one?
To convert a synchronous action method to an asynchronous action method involves the following steps: Instead of deriving the controller from Controller, derive it from AsyncController. Controllers that derive from AsyncController enable ASP.NET to process asynchronous requests, and they can still service synchronous action methods.
Can a controller contain an asynchronous method named sampleasync?
A controller cannot contain an asynchronous method named SampleAsync and a synchronous method named Sample. If it does, an AmbiguousMatchException exception is thrown because the SampleAsync action method and the Sample action method have the same request signature.
What happens when an asynchronous action is invoked?
When an asynchronous action is invoked, the following steps occur: The Web server gets a thread from the thread pool (the worker thread) and schedules it to handle an incoming request. This worker thread initiates an asynchronous operation. The worker thread is returned to the thread pool to service another Web request.
How to use asynchronous controller in Visual Basic?
The NewsAsync method returns void (no value in Visual Basic). The NewsCompleted method returns an ActionResult instance. Although the action consists of two methods, it is accessed using the same URL as for a synchronous action method (for example, Portal/News?city=Seattle).
How does an asynchronous controller work in ASP.NET?
The Web server gets a thread from the thread pool (the worker thread) and schedules it to handle an incoming request. This worker thread initiates an asynchronous operation. The worker thread is returned to the thread pool to service another Web request. When the asynchronous operation is complete, it notifies ASP.NET.
When to use an asynchronous pipeline in MVC?
The operations are primarily CPU operations instead of operations that involve extensive disk or network overhead. Using asynchronous action methods on CPU-bound operations provides no benefits and results in more overhead. In general, use asynchronous pipelines when the following conditions are true: