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What is the yield keyword used for in C#?

In the How Can I Expose Only a Fragment of IList<> question one of the answers had the following code snippet:

IEnumerable<object> FilteredList()
{
    foreach(object item in FullList)
    {
        if(IsItemInPartialList(item))
            yield return item;
    }
}

What does the yield keyword do there? I've seen it referenced in a couple places, and one other question, but I haven't quite figured out what it actually does. I'm used to thinking of yield in the sense of one thread yielding to another, but that doesn't seem relevant here.

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5

simple & brilliant

Harry
– Harry

2020-04-22 10:10:14 +00:00
Commented Apr 22, 2020 at 10:10

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What is the yield keyword used for in C#?

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