Immediate Query Execution : Deferred Query « LINQ « C# / CSharp Tutorial

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C# / CSharp Tutorial » LINQ » Deferred Query

22.76.5.Immediate Query Execution

using System;

using System.Linq;



class MainClass {

    static double Square(double n) {

        Console.WriteLine("Computing Square(" + n + ")...");

        return Math.Pow(n, 2);

    }



    public static void Main() {

        int[] numbers = { 1, 2, 3 };

        var query = from n in numbers select Square(n);

        foreach (var n in query.ToList())

            Console.WriteLine(n);

    }

}

22.76.Deferred Query
	22.76.1.	Deferred Query Execution: shows how query execution is deferred until the query is enumerated at a foreach statement.
	22.76.2.	How queries can be executed immediately with operators such as ToList().
	22.76.3.	Shows how queries can be reused
	22.76.4.	Deferred Query Execution
	22.76.5.	Immediate Query Execution
	22.76.6.	A deferred execution query is reevaluated when you reenumerate:
	22.76.7.	most query operators is that they execute not when constructed, but when enumerated

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