C# - Any Method - Dot Net Perls

Any. This C# method receives a Predicate. It determines if a matching element exists in a collection. We could do this with a loop construct.

A simple method. The Any extension method provides another way to check for a matching element. It has some benefits—it can reduce code size.

Predicate

Extension

All

Example code. Add the System.Linq using directive at the top of your program. This allows you to call the Any extension. In this example, we see an array of 3 integer values.

Here In the program, the 3 values (1, 2 and 3) determine the results of the Any method.

int Array

And The first call tests for any even int. The second tests for any int greater than 3. The third checks for any int equal to 2.

Odd, Even

Tip You can change the expressions in the lambda to determine the correctness of the tests.

Lambda

using System; using System.Linq; int[] array = { 1, 2, 3 }; // See if any elements are divisible by two. bool b1 = array.Any(item => item % 2 == 0); // See if any elements are greater than three. bool b2 = array.Any(item => item > 3); // See if any elements are 2. bool b3 = array.Any(item => item == 2); // Write results. Console.WriteLine(b1); Console.WriteLine(b2); Console.WriteLine(b3);

True False True

Internals. How does the Any method work? When you call the Any method, you are passing a Predicate type, which is a function with a bool result.

And Internally, the Any method loops through each element in the source collection.

Then When it finds an element that the Predicate returns true for, the true result is propagated. It uses an early-exit.

The Any method evaluates a Predicate method on the source collection. It returns a boolean indicating whether any element matches the Predicate.

LINQ

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This page was last updated on Nov 29, 2023 (edit link).

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