Hands-On RESTful Web Services with ASP.NET Core 3

What's new in ASP.NET Core?

Since its introduction in the old ASP.NET framework, the async/await code was previously affected by some deadlock issues. The old version of ASP.NET uses a class called SynchronizationContext, which essentially provides a way to queue a Task to a context when a method calls other tasks that are nested asynchronous methods and forces them to be executed synchronously using the .Result or .Wait() keywords, therefore, this causes a deadlock of the request context.

For example, let's suppose that the following code is executed on the old version of ASP.NET:

   public class ValuesController : ApiController    {        public string Get()        {            return Operation1Async().Result;        }        public async Task<string> Operation1Async()        { await Task.Delay(1000); ...