Should I use Task.Wait()?

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Should I use taskThatReturns.Wait() in code below or I can omit it since according to my understanding taskThatReturns.Result will do wait anyway.

Task<string> taskThatReturns = new Task<string>(MethodThatReturns);
taskThatReturns.Start();
taskThatReturns.Wait();
Console.WriteLine(taskThatReturns.Result);

The call of Wait() before accessing Result is unnecessary.

Examination of the reference code of Task and Task<TResult> shows that both the void Wait() method and the getter of the Result property eventually make their way into the method that does the actual waiting:

internal bool InternalWait(int millisecondsTimeout, CancellationToken cancellationToken)

Both code paths send identical parameter values to InternalWait - infinite wait and default cancellation token.

If you call Wait before accessing Result, the code path inside the getter leading to InternalWait would be skipped, because the task is known to be completed. However, the net result would remain the same in both cases.

Note: This answer intentionally ignores opportunities to optimize your code fragment.

await vs Task.Wait - Deadlock?, There are a few tips that can save you a lot of headaches if you know them. Where to Put a Call to Task. If you must wait until the task end and you do not have nothing more to do you should use Wait () method. Any task can be canceled if the waiting time is unacceptable. If the task lasts unexpectedly long, you can assume that there has been a deadlock and you need to react and clean up, e.g. by canceling the task.

async void DoTask() {
  string task = await returnString();
  Console.WriteLine(task);
}

Task<string> returnString() {
  // you code here
}

You can use async method to await Task execution

Task.Wait Method (System.Threading.Tasks), This is a problem that should be solved using Task.Run . Doing these Yay! await myService. task.Wait(); If we are impatient then we specify a maximum amount of milliseconds for the task to complete otherwise it is abandoned: task.Wait(2000); The other overloads work in a similar manner. View the list of posts on the Task Parallel Library here.

To answer the actual question. You either need to wait to get the results, or you need to do as Panagiotis Kanavos suggested, and await a task. You're overcomplicating threading, a common issue with all the bad examples out there.

Advanced Tips for Using Task.Run With Async/Await, Like Wait , Result will synchronously block the calling thread until the NET 4.0 using the Microsoft. Task.Wait() vs. await. Software Development.NET, C#, Concurrency, TPL. The awaitkeyword is a new keyword in C# 5.0 which, in tandem with asynckeyword, allows us to easily author methods which execute asynchronously in regards to the calling code.

If you still want to use Task better approach is:

var result = taskThatReturns.GetAwaiter().GetResult();

Task.Run Etiquette Examples: Don't Use Task.Run in the , Using asynchronous methods in a command-line application. You could synchronously wait for the async method by using . Is Task.Result the same as .GetAwaiter.GetResult()? on  When Should You Use Task.Delay. This post is about how Task.Delay can be used in different scenarios. Generally speaking we use Task.Delay to wait for specific amount of time in asynchronous fashion. I’m also going to explain why do we need to sometimes mimic this kind of behaviors. What Task.Delay Does?

A Tour of Task, Part 6: Results, To wait for single task we can use the Wait method of the Task object. Check the below code. Use Thread.Sleep when you want to block the current thread. Use Task.Delay when you want a logical delay without blocking the current thread. Efficiency should not be a paramount concern with these methods. Their primary real-world use is as retry timers for I/O operations, which are on the order of seconds rather than milliseconds.

Async/await in a console application, Starting with Google Play services version 9.0.0, you can use a Task API and a number of methods that return Task or its subclasses. An interrupt occurred while waiting for the task to complete. // }. Now, we want to use this from a UI thread, but this method will block our thread. This is a problem that should be solved using Task.Run. Doing these calculations is a CPU-bound operation. // Warning: bad code! class MyService {public Task < int > CalculateMandelbrotAsync {return Task.

How to Wait for Task in C# thread programming • Dot Net For All, // In the real world, we would do something particular.. // For this example, we are only going to (  If you use Task.Run with an I/O operation, you're creating a thread (and probably occupying a CPU core) that will mostly be waiting. It may be a quick and easy way to keep your application responsive, but it's not the most efficient use of system resources. A much better approach is to use await without Task.Run for I/O operations.

Comments
  • You shouldn't use Task.Start at all. You should use var result=await Task.Run(MethodThatReturns);. There's seldom any valid reason to create a cold task
  • Why do you think you should be calling Wait?
  • I have seen Wait method on trainings
  • KISS is advisable: Console.WriteLine(MethodThatReturns());