Async streams with IAsyncEnumerable in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an async stream method that returns integers.

C Sharp (C#)

public async [1]<int> GetNumbersAsync()
{
    yield return 1;
    await Task.Delay(100);
    yield return 2;
}

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

AList

BIAsyncEnumerable

CTask

DIEnumerable

Attempts:

3 left

💡 Hint

Common Mistakes

Using IEnumerable instead of IAsyncEnumerable

Returning Task instead of IAsyncEnumerable

The method must return IAsyncEnumerable<int> to support async streams.

2fill in blank

medium

Complete the code to asynchronously iterate over the async stream.

C Sharp (C#)

await foreach (var number [1] GetNumbersAsync())
{
    Console.WriteLine(number);
}

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Afrom

Bof

Cin

Don

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'of' instead of 'in'

Using 'from' or 'on' which are invalid here

The correct syntax for iterating over an async stream is await foreach (var item in collection).

3fill in blank

hard

Fix the error in the async stream method signature.

C Sharp (C#)

public [1] async IAsyncEnumerable<int> GenerateAsync()
{
    yield return 1;
    await Task.Delay(100);
    yield return 2;
}

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Astatic

Bvoid

Casync

DTask

Attempts:

3 left

💡 Hint

Common Mistakes

Placing async before static

Using void as return type for async streams

The static modifier should come before async and the return type. The method must be declared as public static async IAsyncEnumerable<int> if static.

4fill in blank

hard

Fill both blanks to correctly yield values asynchronously with delay.

C Sharp (C#)

public async IAsyncEnumerable<int> CountAsync()
{
    for (int i = 0; i [1] 3; i++)
    {
        await Task.Delay(100);
        yield [2] i;
    }
}

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A<

B>

Creturn

Dyield return

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' instead of '<' in loop condition

Using 'return' instead of 'yield return'

The loop condition should be i < 3 and to yield values in async streams use yield return.

5fill in blank

hard

Fill all three blanks to filter and yield only even numbers asynchronously.

C Sharp (C#)

public async IAsyncEnumerable<int> EvenNumbersAsync(int[] numbers)
{
    foreach (var num in numbers)
    {
        if (num [1] 2 [2] 0)
        {
            await Task.Delay(50);
            yield [3] num;
        }
    }
}

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

A%

B==

Cyield return

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of '==' for even check

Using 'return' instead of 'yield return'

To check even numbers, use modulo operator % and compare with zero using ==. Yield values with yield return.