What are some examples of deferred execution in LINQ?

What are some examples of deferred execution in LINQ?

Deferred execution in LINQ means that the evaluation of an expression is delayed until its value is actually needed. For example, using IEnumerable<T> allows you to define a query but not execute it until you iterate over the results.

Can you show me a code example?

Sure! Here's a simple example:

var numbers = new List<int> { 1, 2, 3, 4, 5 };
var query = numbers.Where(n => n > 2);

// The query is not executed yet
foreach (var number in query) {
    Console.WriteLine(number); // Executes the query here
}

In this case, the Where clause is not executed until we iterate over query.

What happens if I modify the original list after defining the query?

If you modify the original list after defining the query, the changes will be reflected when you iterate over the query. For example, if you add a number greater than 2 to the list, it will be included in the results.

Can you explain the benefits of deferred execution?

Deferred execution can improve performance by avoiding unnecessary computations and allows for more flexible queries. It also enables you to work with dynamic data that may change before the query is executed.