Yield continue? [closed]

Question

OP edit: This was a bad question predicated upon a misunderstanding of how yield return works. The short answer: If you don't want to yield return something, don't yield return anything.

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There's yield return to return the next element in the collection and then there's yield break to end the iteration. Is there a sort of yield continue to tell the loop controller to skip to the next element?

Here's what I am trying to achieve, though it obviously doesn't build:

static IEnumerable<int> YieldTest()
{
    yield return 1;
    yield return 2;
    yield continue;
    yield return 4;
}

Answer 1

There is no need to have a separate yield continue statement. Just use continue or any other conditional statement to skip the element as you need within your enumeration algorithm.

The enumeration algorithm that uses yield is internally transformed into a state machine by the compiler, which can the be invoked several times. The point of yield is that it generates an output, effectively pausing / stopping the state machine at the place where it's used. The effect of a possible yield continue would be none at all in respect to the behavior of the state machine. Hence it is not needed.

Example:

static IEnumerable<int> YieldTest()
{
    for (int value = 1; value <= 4; value++)
    {
        if (value == 3) continue;  // alternatively use if (value != 3) { … }
        yield return value;
    }
}