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Theres a Do method in System.Reactive to a execute a mutator for each item in the sequence.

Is there any equivalent method for IEnumerable either in standard library or third parties like morelinq?

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LINQ query operators are generally meant to be free from side-effects. You could just use a foreach loop to "do" your thing.

Or do it in a Select or Where method if you don't care about side effects:

enumerable.Select(x => { /*do something here */ return x; })

For a List<T>, there is a ForEach extension method that can be used to execute an Action<T> for each element.

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The Do method executes the action as parte of the pipeline. ForEach does this for a materialized list, that isn't what I need. I need a pull-version of it.
I know, hence the "For a List<T>..." in the answer. So use any of my first two suggestions?

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