Async Await in asp.net core web api?

Question

On first request method gets executed but on the second call it doesn't, I am aslo using await keyword? The method which I am calling is not an async method? When I debug the code user comes null once I logout and again login but by going inside the method with F11 user gets filled, can someone help me to understand this? public async Task AuthenticateUser([FromBody] User user) { Login login = new Login(); user = await login.AuthenticateUser(user.LoginId, user.Password); if (userDetails!= null ) { return Ok(userDetails); } return BadRequest(); }

Tamal Marick · Answer

Yes, absolutely. Doing parallel processing on ASP.NET consumes multiple threads per request, which can severely impact your scalability. Asynchronous processing is far superior for I/O. To use async, first start with your lowest-level call, somewhere inside your service. It's probably doing an HTTP call at some point; change that to use asynchronous HTTP calls (e.g., HttpClient). Then let async grow naturally from there. Eventually, you'll end up with asynchronous getdata1Async, getdata2Async, and getdata3Async methods, which can be consumed concurrently as such: [HttpGet] public async Task myControllerAction() { var t1 = service.getdata1Async(); var t2 = service.getdata2Async(); var t3 = service.getdata3Async(); await Task.WhenAll(t1, t2, t3); var data = new returnObject { d1 = await t1, d2 = await t2, d3 = await t3 }; return Ok(data); } With this approach, while the three service calls are in progress, myControllerAction uses zero threads instead of four.

Sonu Gupta · Answer

Hi, Navigate the below given URL - https://www.red-gate.com/simple-talk/dotnet/net-framework/the-net-4-5-asyncawait-feature-in-promise-and-practice/ https://www.mithunvp.com/fully-asynchronous-aspnet-core-2-web-api/

Sivakumar Koneti · Answer

Read once https://stackoverflow.com/questions/41953102/using-async-await-or-task-in-web-api-controller-net-core

Karan Thakkar · Answer

I tried this approach. But its not working and I am having only-one post request that I have to call? public async Task AuthenticateUser([FromBody] User user) { Login login = new Login (); var t1 = Login .AuthenticateUser(user.LoginId, user.Password); await Task.WhenAll(t1); if (user != null) { return Ok(user); } return BadRequest(); }