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Simple extensions

List<T> implements ForEach(), which is a lot of fun. But we need other places to use it. Here you go:

public static void ForEach<T>(this IEnumerable<T> collection, Action<T> action)
{
    foreach (T obj in collection)
        action(obj);
}

Now if you refactor your code that uses List<T> to use IEnumerable<T>, you don't have to rewrite all your loops. For example:

var list = GetList();
list.ForEach(i => i.Counter++);

This will still work:

var list = GetList().AsEnumerable();
list.ForEach(i => i.Counter++);