Eager evaluation
suggest changeThe 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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