Task.WhenAny for first completion in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a task that returns 5.

C Sharp (C#)

var task = Task.Run(() => [1]);

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AConsole.WriteLine(5)

B"5"

CTask.Delay(1000)

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using Console.WriteLine inside the lambda instead of returning a value.

Returning a string instead of an integer.

The lambda returns the integer 5, so the task completes with result 5.

2fill in blank

medium

Complete the code to await the first task to complete among two tasks.

C Sharp (C#)

var firstFinished = await Task.WhenAny([1], Task.Delay(1000));

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ATask.Run(() => 10)

BTask.Delay(2000)

CTask.CompletedTask

DTask.Run(() => Console.WriteLine("Hi"))

Attempts:

3 left

💡 Hint

Common Mistakes

Using a delay longer than the other task, so it never finishes first.

Using a task that does not complete or returns void.

Task.WhenAny waits for the first task to finish. The task returning 10 finishes before the 1-second delay.

3fill in blank

hard

Fix the error in the code to get the result of the first completed task.

C Sharp (C#)

var firstFinished = await Task.WhenAny(task1, task2);
var result = firstFinished.[1];

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AResult

BGetResult()

CResultAsync

DGetAwaiter()

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to call a method that does not exist.

Using GetAwaiter() without awaiting.

Task.WhenAny returns the first completed task. Access its Result property to get the value.

4fill in blank

hard

Fill both blanks to create two tasks and await the first to complete.

C Sharp (C#)

var task1 = Task.Run(() => [1]);
var task2 = Task.Run(() => [2]);
var first = await Task.WhenAny(task1, task2);

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A100

BTask.Delay(500).Wait(); return 200;

CTask.Delay(1000).Wait(); return 300;

DConsole.WriteLine("Done")

Attempts:

3 left

💡 Hint

Common Mistakes

Using Console.WriteLine which returns void.

Making both tasks delay the same time.

Task1 returns 100 immediately. Task2 waits 500ms then returns 200. The first task finishes immediately.

5fill in blank

hard

Fill all three blanks to create tasks and get the result of the first completed task.

C Sharp (C#)

var task1 = Task.Run(() => [1]);
var task2 = Task.Run(() => [2]);
var first = await Task.WhenAny(task1, task2);
var result = first.[3];

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ATask.Delay(1000).Wait(); return 42;

B500

CResult

DTask.Delay(200).Wait(); return 24;

Attempts:

3 left

💡 Hint

Common Mistakes

Accessing the result before awaiting the task.

Using wrong property or method to get the result.

Task2 returns 500 immediately. Task1 delays 200 ms then returns 24. The first completed task returns 500. Access Result to get the value.