Editing Generator (computer programming) (section)

===C#===
An example C# 2.0 generator (the <code>yield</code> is available since C# version 2.0):
Both of these examples utilize generics, but this is not required. yield keyword also helps in implementing custom stateful iterations over a collection as discussed in this discussion.<ref>{{Cite web|url=https://stackoverflow.com/a/15977474 |title=What is the yield keyword used for in C#?|website=stackoverflow.com|access-date=2018-01-01}}</ref>

<syntaxhighlight lang="csharp">
// Method that takes an iterable input (possibly an array)
// and returns all even numbers.
public static IEnumerable<int> GetEven(IEnumerable<int> numbers)
{
    foreach (int number in numbers)
    {
        if ((number % 2) == 0)
        {
            yield return number;
        }
    }
}
</syntaxhighlight>

It is possible to use multiple <code>yield return</code> statements and they are applied in sequence on each iteration:
<syntaxhighlight lang="csharp">
public class CityCollection : IEnumerable<string>
{
    public IEnumerator<string> GetEnumerator()
    {
        yield return "New York";
        yield return "Paris";
        yield return "London";
    }
}
</syntaxhighlight>