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The Role of Differed Execution

Another important point regarding LINQ query expressions is that they are not actually evaluated

until you iterate over their contents. Formally speaking, this is termed differed execution. The bene-

fit of this approach is that you are able to apply the same LINQ query multiple times to the same

container, and rest assured you are obtaining the latest and greatest results. Consider the following

update to the QueryOverInts() method:

static void QueryOverInts()

{

int[] numbers = { 10, 20, 30, 40, 1, 2, 3, 8 };

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8849CH14.qxd  9/26/07  12:30 PM  Page 454

---

// Get numbers less than ten.

var subset = from i in numbers where i < 10 select i;