How async execution flows in C Sharp (C#) - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an asynchronous method.

C Sharp (C#)

public async Task [1]() {
    await Task.Delay(1000);
}

Drag options to blanks, or click blank then click option'

AFetchData

BRun

CExecuteAsync

DDoWork

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names without 'Async' suffix for async methods.

The method name 'ExecuteAsync' clearly indicates it is asynchronous, which is a common naming convention.

2fill in blank

medium

Complete the code to await an asynchronous method call.

C Sharp (C#)

await [1]();

Drag options to blanks, or click blank then click option'

AExecuteAsync

BRun

CDoWork

DFetchData

Attempts:

3 left

💡 Hint

Common Mistakes

Awaiting methods that are not asynchronous.

You await the asynchronous method named 'ExecuteAsync' to pause execution until it completes.

3fill in blank

hard

Fix the error in the async method by adding the missing keyword.

C Sharp (C#)

public [1] Task<int> GetNumberAsync() {
    return Task.FromResult(42);
}

Drag options to blanks, or click blank then click option'

Avoid

Bawait

Cstatic

Dasync

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the 'async' keyword on asynchronous methods.

The 'async' keyword is required to mark the method as asynchronous.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that filters async tasks by completion status.

C Sharp (C#)

var completedTasks = tasks.Where(t => t.[1]).ToDictionary(t => t.Id, t => t.[2]);

Drag options to blanks, or click blank then click option'

AIsCompleted

BResult

CStatus

DStartTime

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Status' instead of 'IsCompleted' for filtering.

Using 'StartTime' instead of 'Result' for dictionary values.

Use 'IsCompleted' to filter completed tasks and 'Result' to get their results in the dictionary.

5fill in blank

hard

Fill all three blanks to create an async method that returns the length of a string after a delay.

C Sharp (C#)

public async Task<int> [1](string input) {
    await Task.[2](500);
    return input.[3];
}

Drag options to blanks, or click blank then click option'

AGetLengthAsync

BDelay

CLength

DWait

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Wait' instead of 'Delay' causes blocking instead of async wait.

Returning 'input.Length()' with parentheses causes error because Length is a property.

The method name is 'GetLengthAsync', it awaits 'Task.Delay(500)', then returns 'input.Length'.