Using IEnumerator for async operation on items

Question

I am using some API that returns me an IEnumerator child Instance i want to do some function on each object returned

I usualy use

while(Enumerator.MoveNext())
{
    DoSomething(Enumerator.current);
}

I don't have IEnumerable Object and I want to DoSomething with each object asynchronously

I don't want to get IEnumerable from IEnumerator for performance issues.

What else can i do to loop async with IEnumerator

It's not clear if you want to fetch items asynchronously or DoSomething asynchronously. — GSerg, Jul 25 '19 at 17:21
Then nothing stops you from doing `await DoSomething(Enumerator.current)`. — GSerg, Jul 25 '19 at 18:54
And if by "asynchronously" you meant "in parallel", then see https://stackoverflow.com/q/19431494/11683. — GSerg, Jul 25 '19 at 19:06

score 5 · Answer 1 · answered Jul 25 '19 at 17:20

5

C# 8.0 has Async Enumerable feature.

static async Task Main(string[] args)
{
    await foreach (var dataPoint in FetchIOTData())
    {
        Console.WriteLine(dataPoint);
    }

    Console.ReadLine();
}

static async IAsyncEnumerable<int> FetchIOTData()
{
    for (int i = 1; i <= 10; i++)
    {
        await Task.Delay(1000);//Simulate waiting for data to come through. 
        yield return i;
    }
}

answered Jul 25 '19 at 17:20

AgentFire

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How can I use that in VS2017 – M. Khalil Jul 25 '19 at 17:34
[You can't](https://stackoverflow.com/questions/54701377/c-sharp-8-0-availability-in-visual-studio-2017). it's not backward-compatible technology. It is also still in beta. Upgrade to VS2019 and use it. – AgentFire Jul 26 '19 at 10:57
Interesting, but distinct from an IEnumerator, no? – Captain Prinny Jun 22 '21 at 16:46

Using IEnumerator for async operation on items

1 Answers1