Eager evaluation

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The yield keyword allows lazy-evaluation of the collection. Forcibly loading the whole collection into memory is called eager evaluation.

The following code shows this:

IEnumerable<int> myMethod()
    for(int i=0; i <= 8675309; i++)
        yield return i;
// define the iterator
var it = myMethod.Take(3);
// force its immediate evaluation
// list will contain 0, 1, 2
var list = it.ToList();

Calling ToList, ToDictionary or ToArray will force the immediate evaluation of the enumeration, retrieving all the elements into a collection.

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