linq Method execution modes - immediate, deferred streaming, deferred non-streaming Benefits of deferred execution - building queries
Example
Deferred execution enables combining different operations to build the final query, before evaluating the values:
var list = new List<int>() {1,1,2,3,5,8};
var query = list.Select(x => x + 1);
If we execute the query at this point:
foreach (var x in query) {
Console.Write($"{x} ");
}
we would get the following output:
2 2 3 4 6 9
But we can modify the query by adding more operators:
Console.WriteLine();
query = query.Where(x => x % 2 == 0);
query = query.Select(x => x * 10);
foreach (var x in query) {
Console.Write($"{x} ");
}
Output:
20 20 40 60
