c# - 语法:yield return enumerable without loop

Question

这可能吗？

List<Cat> _Cats; // created somewhere else

public IEnumerable<Cat> LeadWithLolCat()
{
    yield return RandomLolCat();

    // can we return all the other cats without creating a loop?
    foreach ( var cat in _Cats ) // -> so not like this
        yield return cat;
}

Answer 1

您可以像这样尝试使用 Concat:

public IEnumerable<Cat> LeadWithLolCat()
{
    return new [] { RandomLolCat() }.Concat(_Cats);
}