In LINQ to Objects, myCollection.Cast().First() will cast the entire collection or just the first element?

Question

I want to know whether the Cast() operation is performed on the entire IEnumerable<T> or just on the filtered portion or it.

You might want to have a look at my question which is related and answers your question indirectly: [Order of LINQ extension methods does not affect performance?](http://stackoverflow.com/questions/10110013/order-of-linq-extension-methods-does-not-affect-performance) — Tim Schmelter, Nov 16 '12 at 12:58

score 3 · Accepted Answer · answered Nov 16 '12 at 12:56

3

Linq operations are deferred, only the first element will be cast and then returned.

You can try it yourself:

object[] objects = new object[] { 123, "string" };
objects.Cast<int>().First();

answered Nov 16 '12 at 12:56

strmstn

1

This is a good way of checking it out which I didn't think of. Thank you @strmstn – Andre Pena Nov 16 '12 at 12:57

1 Answers1