Using an Asynchronous Controller in ASP.NET MVC (2023)

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  • 10 minutes to read

The AsyncController class enables you to write asynchronous action methods. You can use asynchronous action methods for long-running, non-CPU bound requests. This avoids blocking the Web server from performing work while the request is being processed. A typical use for the AsyncController class is long-running Web service calls.

This topic contains the following sections:

  • How Requests Are Processed by the Thread Pool

  • Processing Asynchronous Requests

  • Choosing Synchronous or Asynchronous Action Methods

  • Converting Synchronous Action Methods to Asynchronous Action Methods

  • Performing Multiple Operations in Parallel

  • Adding Attributes to Asynchronous Action Methods

  • Working with the BeginMethod/EndMethod Pattern

  • Class Reference

A Visual Studio project with source code is available to accompany this topic: Download.

(Video) (#71) Async controller in MVC | mvc tutorial for beginners in .net c# | MVC By Nitish

How Requests Are Processed by the Thread Pool

On the Web server, the .NET Framework maintains a pool of threads that are used to service ASP.NET requests. When a request arrives, a thread from the pool is dispatched to process that request. If the request is processed synchronously, the thread that processes the request is blocked while the request is being processed, and that thread cannot service another request.

This might not be a problem, because the thread pool can be made large enough to accommodate many blocked threads. However, the number of threads in the thread pool is limited. In large applications that process multiple simultaneous long-running requests, all available threads might be blocked. This condition is known as thread starvation. When this condition is reached, the Web server queues requests. If the request queue becomes full, the Web server rejects requests with an HTTP 503 status (Server Too Busy).

Processing Asynchronous Requests

In applications where thread starvation might occur, you can configure actions to be processed asynchronously. An asynchronous request takes the same amount of time to process as a synchronous request. For example, if a request makes a network call that requires two seconds to complete, the request takes two seconds whether it is performed synchronously or asynchronously. However, during an asynchronous call, the server is not blocked from responding to other requests while it waits for the first request to complete. Therefore, asynchronous requests prevent request queuing when there are many requests that invoke long-running operations.

When an asynchronous action is invoked, the following steps occur:

  1. 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.

  2. The worker thread is returned to the thread pool to service another Web request.

  3. When the asynchronous operation is complete, it notifies ASP.NET.

  4. The Web server gets a worker thread from the thread pool (which might be a different thread from the thread that started the asynchronous operation) to process the remainder of the request, including rendering the response.

The following illustration shows the asynchronous pattern.

Using an Asynchronous Controller in ASP.NET MVC (1)

Choosing Synchronous or Asynchronous Action Methods

This section lists guidelines for when to use synchronous or asynchronous action methods. These are just guidelines; you must examine each application individually to determine whether asynchronous action methods help with performance.

In general, use synchronous pipelines when the following conditions are true:

  • The operations are simple or short-running.

    (Video) When should I use Async Controllers in ASP.NET MVC - C#

  • Simplicity is more important than efficiency.

  • 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:

The downloadable sample shows how to use asynchronous action methods effectively. The sample program calls the Sleep method to simulate a long-running process. Few production applications will show such obvious benefits to using asynchronous action methods.

You should test applications to determine whether asynchronous methods provide a performance benefit. In some cases it might be better to increase the IIS maximum concurrent requests per CPU and the maximum concurrent threads per CPU. For more information about ASP.NET thread configuration, see the entry ASP.NET Thread Usage on IIS 7.0 and 6.0on Thomas Marquardt's blog. For more information about when to make asynchronous database calls, see the entry Should my database calls be Asynchronous? on Rick Anderson's blog.

Few applications require all action methods to be asynchronous. Often, converting a few synchronous action methods to asynchronous methods provides the best efficiency increase for the amount of work required.

Converting Synchronous Action Methods to Asynchronous Action Methods

The sample code below shows a synchronous action method that is used to display news items from a portal controller. The request Portal/News?city=Seattle displays news for Seattle.

public class PortalController: Controller { public ActionResult News(string city) { NewsService newsService = new NewsService(); ViewStringModel headlines = newsService.GetHeadlines(city); return View(headlines); }}

The following example shows the News action method rewritten as an asynchronous method.

public class PortalController : AsyncController { public void NewsAsync(string city) { AsyncManager.OutstandingOperations.Increment(); NewsService newsService = new NewsService(); newsService.GetHeadlinesCompleted += (sender, e) => { AsyncManager.Parameters["headlines"] = e.Value; AsyncManager.OutstandingOperations.Decrement(); }; newsService.GetHeadlinesAsync(city); } public ActionResult NewsCompleted(string[] headlines) { return View("News", new ViewStringModel { NewsHeadlines = headlines }); }}
Public Class PortalController Inherits AsyncController Public Sub NewsAsync(ByVal city As String) AsyncManager.OutstandingOperations.Increment() Dim newsService As New NewsService() newsService.GetHeadlinesCompleted += Function(sender, e) Do AsyncManager.Parameters("headlines") = e.Value AsyncManager.OutstandingOperations.Decrement() End Function newsService.GetHeadlinesAsync(city) End Sub Public Function NewsCompleted(ByVal headlines() As String) _ As ActionResult Return View("News", New ViewStringModel() {NewsHeadlines=headlines}) End FunctionEnd Class

To convert a synchronous action method to an asynchronous action method involves the following steps:

(Video) Basic Async and Await controller in mvc

  1. 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.

  2. Create two methods for the action. The method that initiates the asynchronous process must have a name that consists of the action and the suffix "Async". The method that is invoked when the asynchronous process finishes (the callback method) must have a name that consists of the action and the suffix "Completed". In the previous example, the News method has been turned into two methods: NewsAsync and NewsCompleted.

    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). Methods such as RedirectToAction and RenderAction will also refer to the action method as News and not NewsAsync.

    The parameters that are passed to NewsAsync use the normal parameter binding mechanisms. The parameters that are passed to NewsCompleted use the Parameters dictionary.

  3. Replace the synchronous call in the original ActionResult method with an asynchronous call in the asynchronous action method. In the example above, the call to newsService.GetHeadlines is replaced with a call to newsService.GetHeadlinesAsync.

The NewsService class that is consumed by the NewsAsync method is an example of a service that exposes methods using an event-based asynchronous pattern. For more information about this pattern, see Event-based Asynchronous Pattern Overview.

The OutstandingOperations property notifies ASP.NET about how many operations are pending. This is required because ASP.NET cannot determine how many operations were initiated by the action method or when those operations are complete. When OutstandingOperations property is zero, ASP.NET completes the overall asynchronous operation by calling the NewsCompleted method.

Note the following about asynchronous action methods:

Performing Multiple Operations in Parallel

Asynchronous action methods are useful when an action must perform several independent operations. For example, a portal site might show not only news, but sports, weather, stocks, and other information.

The following example shows a synchronous version of news portal Index action method.

(Video) Asynchronous Web Application Development in ASP.NET MVC 5 using C# 5.0

public ActionResult IndexSynchronous( string city ) { NewsService newsService = new NewsService(); string[] headlines = newsService.GetHeadlines(); SportsService sportsService = new SportsService(); string[] scores = sportsService.GetScores(); WeatherService weatherService = new WeatherService(); string[] forecast = weatherService.GetForecast(); return View("Common", new PortalViewModel { NewsHeadlines = headlines, SportsScores = scores, Weather = forecast });}
Public Function IndexSynchronous(ByVal city As String) As ActionResult Dim newsService As NewsService = New NewsService Dim headlines() As String = newsService.GetHeadlines Dim sportsService As SportsService = New SportsService Dim scores() As String = sportsService.GetScores Dim weatherService As WeatherService = New WeatherService Dim forecast() As String = weatherService.GetForecast Return View("Common", New PortalViewModel() {NewsHeadlines=headlines, SportsScores=scores, Weather=forecast})End Function

The calls to each service are made sequentially. Therefore, the time that is required in order to respond to the request is the sum of each service call plus a small amount of overhead. For example, if the calls take 400, 500, and 600 milliseconds, the total response time will be slightly more than 1.5 seconds. However, if the service calls are made asynchronously (in parallel), the total response time will be slightly more than 600 milliseconds, because that is the duration of the longest task.

The following example shows an asynchronous version of the news portal Index action method.

public void IndexAsync(string city) { AsyncManager.OutstandingOperations.Increment(3); NewsService newsService = new NewsService(); newsService.GetHeadlinesCompleted += (sender, e) => { AsyncManager.Parameters["headlines"] = e.Value; AsyncManager.OutstandingOperations.Decrement(); }; newsService.GetHeadlinesAsync(); SportsService sportsService = new SportsService(); sportsService.GetScoresCompleted += (sender, e) => { AsyncManager.Parameters["scores"] = e.Value; AsyncManager.OutstandingOperations.Decrement(); }; sportsService.GetScoresAsync(); WeatherService weatherService = new WeatherService(); weatherService.GetForecastCompleted += (sender, e) => { AsyncManager.Parameters["forecast"] = e.Value; AsyncManager.OutstandingOperations.Decrement(); }; weatherService.GetForecastAsync();}public ActionResult IndexCompleted(string[] headlines, string[] scores, string[] forecast) { return View("Common", new PortalViewModel { NewsHeadlines = headlines, SportsScores = scores, Weather = forecast });} }
Public Sub IndexAsync(ByVal city As String) AsyncManager.OutstandingOperations.Increment(3) Dim newsService As New NewsService() newsService.GetHeadlinesCompleted += Function(sender, e) Do AsyncManager.Parameters("headlines") = e.Value AsyncManager.OutstandingOperations.Decrement() End Function newsService.GetHeadlinesAsync() Dim sportsService As New SportsService() sportsService.GetScoresCompleted += Function(sender, e) Do AsyncManager.Parameters("scores") = e.Value AsyncManager.OutstandingOperations.Decrement() End Function sportsService.GetScoresAsync() Dim weatherService As New WeatherService() weatherService.GetForecastCompleted += Function(sender, e) Do AsyncManager.Parameters("forecast") = e.Value AsyncManager.OutstandingOperations.Decrement() End Function weatherService.GetForecastAsync()End SubPublic Function IndexCompleted(ByVal headlines() As String, _ ByVal scores() As String, _ ByVal forecast() As String) As ActionResult Return View("Common", New PortalViewModel() {NewsHeadlines=headlines, SportsScores=scores, Weather=forecast})End Function

In the previous example, the Increment method is called with a parameter of 3 because there are three asynchronous operations.

Adding Attributes to Asynchronous Action Methods

If you want to apply attributes to an asynchronous action method, apply them to the ActionAsync method instead of to the ActionCompleted method. Attributes on the ActionCompleted method are ignored.

Two new attributes have been added: AsyncTimeoutAttribute and NoAsyncTimeoutAttribute. These attributes let you control the asynchronous timeout period.

Working with the BeginMethod/EndMethod Pattern

If an asynchronous action method calls a service that exposes methods by using the BeginMethod/EndMethod pattern, the callback method (that is, the method that is passed as the asynchronous callback parameter to the Begin method) might execute on a thread that is not under the control of ASP.NET. In that case, HttpContext.Current will be null, and the application might experience race conditions when it accesses members of the AsyncManager class such as Parameters. To make sure that you have access to the HttpContext.Current instance and to avoid the race condition, you can restore HttpContext.Current by calling Sync() from the callback method.

If the callback completes synchronously, the callback will be executed on a thread that is under the control of ASP.NET and the operations will be serialized so there are no concurrency issues. Calling Sync() from a thread that is already under the control of ASP.NET has undefined behavior.

The ActionCompleted method will always be called on a thread that is under the control of ASP.NET. Therefore, do not call fSync() from that method.

The callback that you pass to the Begin method might be called using a thread that is under the control of ASP.NET. Therefore, you must check for this condition before you call Sync(). If the operation completed synchronously (that is, if CompletedSynchronously is true), the callback is executing on the original thread and you do not have to call Sync(). If the operation completed asynchronously (that is, CompletedSynchronously is false), the callback is executing on a thread pool or I/O completion port thread and you must call Sync().

For more information about the BeginMethod/EndMethod pattern, see Asynchronous Programming Overview and the entry Using the BeginMethod/EndMethod pattern with MVC on Rick Anderson's blog.

Class Reference

The following table lists the key classes for asynchronous action methods.

Class

Description

AsyncController

Provides the base class for asynchronous controllers.

AsyncManager

Provides asynchronous operations for the AsyncController class.

See Also

Concepts

Controllers and Action Methods in ASP.NET MVC Applications

FAQs

Should I use async controller actions? ›

async actions help best when the actions does some I\O operations to DB or some network bound calls where the thread that processes the request will be stalled before it gets answer from the DB or network bound call which you just invoked.

What is async controller in MVC why one should use it? ›

The asynchronous controller enables you to write asynchronous action methods. It allows you to perform long running operation(s) without making the running thread idle. It does not mean it will take lesser time to complete the action.

What is primary purpose of using an async controller action? ›

The AsyncController class enables you to write asynchronous action methods. You can use asynchronous action methods for long-running, non-CPU bound requests. This avoids blocking the Web server from performing work while the request is being processed.

How do you solve an asynchronous module or handler completed while an asynchronous operation was still pending? ›

ASP.NET Controller: An asynchronous module or handler completed while an asynchronous operation was still pending
  1. If we remove task = DownloadAsync(); from the constructor and put it into the Index method it will work fine without the errors.
  2. If we use another DownloadAsync() body return await Task. Factory.

Is async better than promises? ›

Using Async/Await makes it easier to read and understand the flow of the program as compared to promise chains.

What is the benefit of using async? ›

Benefits of Asynchronous Programming

Improve your application's performance and responsiveness, especially if you have long-running operations that don't require blocking the execution. In this case, you can do other things while you wait for the long-running Task to finish.

Should I always use async? ›

Asynchronous loops are necessary when there is a large number of iterations involved or when the operations within the loop are complex. But for simple tasks like iterating through a small array, there is no reason to overcomplicate things by using a complex recursive function.

Why async is better than sync? ›

Async is non-blocking, which means it will send multiple requests to a server. Sync is blocking — it will only send the server one request at a time and will wait for that request to be answered by the server. Async increases throughput because multiple operations can run at the same time.

How does async improve performance? ›

Asynchronous programming can in some cases help with performance by parallelizing a task. But, that is not its main benefit in day to day development. Instead, the main benefit comes from making our code more scalable. The scalability feature of a system relates to how it handles a growing amount of work.

Why we use async method in C#? ›

The async keyword turns a method into an async method, which allows you to use the await keyword in its body. When the await keyword is applied, it suspends the calling method and yields control back to its caller until the awaited task is complete.

Which is the best approach to assign a session in MVC? ›

Which of following is the best approach to assign a session in MVC? Current. Session["LoginID"] =7; is the best approach to assign a session in MVC.

What happens when you call an async method? ›

The call to the async method starts an asynchronous task. However, because no Await operator is applied, the program continues without waiting for the task to complete. In most cases, that behavior isn't expected.

How do you handle asynchronous code? ›

JavaScript provides three methods of handling asynchronous code: callbacks, which allow you to provide functions to call once the asynchronous method has finished running; promises, which allow you to chain methods together; and async/await keywords, which are just some syntactic sugar over promises.

Does async await run in parallel? ›

You can call multiple asynchronous functions without awaiting them. This will execute them in parallel. While doing so, save the returned promises in variables, and await them at some point either individually or using Promise.

What are the three main patterns of asynchronous? ›

The three patterns discussed here are callbacks, promises, and async/await. There are other patterns as well as multiple variations of each so this post might expand in the future.

Why asynchronous is faster? ›

Asynchronous circuits are usually faster than synchronous circuits because they are free running and do not depend on the frequency of the clock. All the state variable changes are synchronized with a universal clock signal.

Which is faster async await or promise? ›

Yes, you read that right. The V8 team made improvements that make async/await functions run faster than traditional promises in the JavaScript engine.

Does async use more memory? ›

So, for the same number of threads being, it can handle more requests. But it does that at the cost of more control data structures and more work. So, (other than saving thread pool threads) it consumes more resources (memory, CPU).

What is the disadvantages of asynchronous? ›

Disadvantages of Asynchronous Teaching

Students may feel less personally exchanged and less satisfied without the social interaction between their peers and instructors. Course material may be misunderstood or have the potential to be misconstrued without the real-time interaction.

Can we use await without async? ›

You can use the await keyword on its own (outside of an async function) within a JavaScript module. This means modules, with child modules that use await , wait for the child module to execute before they themselves run, all while not blocking other child modules from loading.

Is asynchronous always faster? ›

It's not faster, it just doesn't waste time. Synchronous code stops processing when waiting for I/O. Which means that when you're reading a file you can't run any other code. Now, if you have nothing else to do while that file is being read then asynchronous code would not buy you anything much.

Can we use only async without await? ›

Use of async and await enables the use of ordinary try / catch blocks around asynchronous code. Note: The await keyword is only valid inside async functions within regular JavaScript code. If you use it outside of an async function's body, you will get a SyntaxError .

Is asynchronous faster than synchronous? ›

Synchronous transmission is fast. Asynchronous transmission is slow.

Is async faster than threads? ›

Tasks + async / await are faster in this case than a pure multi threaded code. It's the simplicity which makes async / await so appealing. writing a synchronous code which is actually asynchronous.

Should I use async await everywhere C#? ›

Async/Await has been around since C# version 5.0 (2012) and has quickly become one of the pillars of modern . NET programming — any C# developer worth his/her salt should be using it to improve application performance, overall responsiveness, and code legibility.

Why is asynchronous slow? ›

On a quick look, the results are expected: your async sum is using just one thread, while you asynchronously wait for it to finish, so it's slower than the multi-threaded sum. You'd use async in case you have something else to finish while it's doing its job.

Do async functions run immediately? ›

An async function runs synchronously until the first await keyword. This means that within an async function body, all synchronous code before the first await keyword executes immediately.

What is the advantage of async await in C #? ›

A significant benefit of the async/await pattern in languages that support it is that asynchronous, non-blocking code can be written, with minimal overhead, and looking almost like traditional synchronous, blocking code.

Why asynchronous code is necessary? ›

Asynchronous programming is a technique that enables your program to start a potentially long-running task and still be able to be responsive to other events while that task runs, rather than having to wait until that task has finished.

What is difference between async and await in C#? ›

Here, we have to use await keyword before passing a parameter in Method3 and for it, we have to use the async keyword from the calling method. If we are using C# 7 or less, then we cannot use async keyword in the Main method for the console Application because it will give the error below.

Why ViewData is faster than ViewBag? ›

Requires typecasting for complex data type and checks for null values to avoid error. If redirection occurs, then its value becomes null. ViewData is faster than ViewBag.

Which is better TempData or session in MVC? ›

TempData is ideal for short-lived things like displaying validation errors or other messages that we don't need to persist for longer than a single request. Session is ideal choice when we need to persist data for extended periods of time i.e. it is used to store data which is required throughout user session.

Do I need to use Session_start on every page? ›

It must be on every page you intend to use. The variables contained in the session—such as username and favorite color—are set with $_SESSION, a global variable. In this example, the session_start function is positioned after a non-printing comment but before any HTML.

What happens if we execute an asynchronous method but do not await it? ›

If you forget to use await while calling an async function, the function starts executing. This means that await is not required for executing the function. The async function will return a promise, which you can use later.

What happens when async function throws error? ›

Error thrown from async function is a rejected promise

(1) Use . catch() chain function to catch the error within the promise chain. (2) Change testFn to an async function and use await to wait for the resolution of the rejected promise.

Does async wait for response? ›

Asynchronous requests will wait for a timer to finish or a request to respond while the rest of the code continues to execute. Then when the time is right a callback will spring these asynchronous requests into action.

Why is asynchronous programming difficult? ›

Async programming is infested with code-tangles and callback hells, simply because being async means having a non-linear non-sequential execution flow, which is at odds with the sequential nature of text-based codes.

Is asynchronous programming difficult? ›

Asynchronous programming can be difficult, though, since you must comprehend the many ways in which your code will run. The distinctions between synchronous and asynchronous programming in various languages will be discussed in this article, along with explaining how either technique might help your project.

What are some potential problems with asynchronous communication? ›

Disadvantages of Asynchronous Communication for Remote Teams
  • Feelings of isolation. The lack of face-to-face meetings or real-time connections can make some staff members feel isolated or lonely.
  • Lack of connection. ...
  • Less spontaneous brainstorming. ...
  • Responses take time.

Can you have multiple async functions? ›

You can call multiple asynchronous functions without awaiting them. This will execute them in parallel. While doing so, save the returned promises in variables, and await them at some point either individually or using Promise.

Which is better async await or then? ›

Async/await and then() are very similar. The difference is that in an async function, JavaScript will pause the function execution until the promise settles. With then() , the rest of the function will continue to execute but JavaScript won't execute the . then() callback until the promise settles.

Does async await improve performance? ›

The main benefits of asynchronous programming using async / await include the following: Increase the performance and responsiveness of your application, particularly when you have long-running operations that do not require to block the execution.

Why is it called asynchronous? ›

In general, asynchronous -- pronounced ay-SIHN-kro-nuhs, from Greek asyn-, meaning "not with," and chronos, meaning "time" -- is an adjective describing objects or events that are not coordinated in time.

What is an example of an asynchronous? ›

In a nutshell, asynchronous communication is any communication that does not take place in real-time. Emails, forum comments, corporate intranet, and even Asana or Trello boards serve as examples of asynchronous communication we deal with every day.

What is asynchronous technique in MVC? ›

Asynchronous actions allow developers to handle more concurrent requests and can be implemented using async / await keywords. Asynchronous actions are useful in scenarios where we are performing some network operation such as calling a remote service, webapi etc.

› javascript › asynchronous-javasc... ›

This article introduces you to asynchronous JavaScript and explains why you should start using async/await functions today.
To solve this, callbacks — which are functions passed into other functions as an argument to be executed later — were used to perform asynchronous functions. Us...
Asynchronous programming is a form of parallel programming that allows a unit of work to run separately from the primary application thread. When the work is co...

Should I always use async? ›

Asynchronous loops are necessary when there is a large number of iterations involved or when the operations within the loop are complex. But for simple tasks like iterating through a small array, there is no reason to overcomplicate things by using a complex recursive function.

Should I use async or defer? ›

In practice, defer is used for scripts that need the whole DOM and/or their relative execution order is important. And async is used for independent scripts, like counters or ads. And their relative execution order does not matter.

Is async better than threading? ›

Asyncio vs threading: Async runs one block of code at a time while threading just one line of code at a time. With async, we have better control of when the execution is given to other block of code but we have to release the execution ourselves.

Is ProducesResponseType needed? ›

Because there are multiple return types and paths in this type of action, liberal use of the [ProducesResponseType] attribute is necessary. This attribute produces more descriptive response details for web API help pages generated by tools like Swagger.

Does async improve performance? ›

Using asynchronous code does not give an increased performance on a development machine. The reason is that there is not enough load to see the overall benefit. But for a production environment, it can process more requests.

Can we use await without async? ›

You can use the await keyword on its own (outside of an async function) within a JavaScript module. This means modules, with child modules that use await , wait for the child module to execute before they themselves run, all while not blocking other child modules from loading.

Why asynchronous is faster? ›

Asynchronous circuits are usually faster than synchronous circuits because they are free running and do not depend on the frequency of the clock. All the state variable changes are synchronized with a universal clock signal.

Is async faster than defer? ›

domInteractive). Comparing the ASYNC and DEFER waterfalls, we see that using DEFER makes DOM Interactive fire sooner and allows rendering to proceed more quickly. HOWEVER: Even though ASYNC and DEFER don't block the HTML parser, they can block rendering.

Does async use more memory? ›

So, for the same number of threads being, it can handle more requests. But it does that at the cost of more control data structures and more work. So, (other than saving thread pool threads) it consumes more resources (memory, CPU).

What happens if we dont use async await? ›

The call to the async method starts an asynchronous task. However, because no Await operator is applied, the program continues without waiting for the task to complete. In most cases, that behavior isn't expected.

Is asynchronous always faster? ›

It's not faster, it just doesn't waste time. Synchronous code stops processing when waiting for I/O. Which means that when you're reading a file you can't run any other code. Now, if you have nothing else to do while that file is being read then asynchronous code would not buy you anything much.

Which is faster asynchronous or synchronous? ›

In the synchronous counter, the operation is faster. In Asynchronous counter the operation is slower. 3. Synchronous counter is also known as Parallel counter.

Is asynchronous faster? ›

Asynchronous functions

Front end applications benefit from its use because it enhances the flow of an application. Backend processes may use asynchronous functions to run many tasks or make lots of network calls. In the backend, asynchronous programming allows the computer to do more, faster.

What is the difference between IActionResult and IHttpActionResult? ›

What is the difference between IHttpActionResult and IActionresult ? "IActionResult is the new abstraction that should be used in your actions. Since Web API and MVC frameworks have been unified in ASP.NET Core, various IActionResult implementations can handle both traditional API scenarios.".

Should service be scoped or transient? ›

Use Transient lifetime for the lightweight service with little or no state. Scoped services service is the better option when you want to maintain state within a request. Singletons are created only once and not destroyed until the end of the Application. Any memory leaks in these services will build up over time.

What is return type in MVC? ›

An ActionResult is a return type of a controller method in MVC. Action methods help us to return models to views, file streams, and also redirect to another controller's Action method.

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