Any

In this chapter you will learn:

How to use Any operator
Any without expression
Any with mod operator
Any with string operator
How to use Any operator with custom types

Any operator

Any returns true if the given expression is true for at least one element.

using System;//from   j a  va 2  s. c  o m
using System.Collections;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        bool hasAThree = new int[] { 2, 3, 4 }.Any(n => n == 3);  // true;
        Console.WriteLine(hasAThree);
    }
}

The output:

Any without expression

Calling Any without an expression returns true if the sequence has one or more elements.

Here's another way to write the preceding query:

using System;//j a  v  a2s .  c om
using System.Collections;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        bool hasABigNumber = new int[] { 2, 3, 4 }.Where(n => n > 10).Any(); 
        
        Console.WriteLine(hasABigNumber);
    }
}

The output:

Any with mod operator

using System;/*  j  a va2s.com*/
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;

public class MainClass{
   public static void Main(){
       int[] numbers = { 2, 6, 1, 5, 10 };
       Console.Write(numbers.Any(e => e % 2 == 1));
   }
}

Any with string operator

using System;//from   j  av  a2s.  co m
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class MainClass {
    public static void Main() {
        string[] words = { "bei", "rie", "rei", "field" };

        bool iAfterE = words.Any(w => w.Contains("ei"));

        Console.WriteLine(iAfterE);
    }
}

The following code uses All with string StartsWith method.

using System;//j av a  2s  .  c o m
using System.Linq;
using System.Collections;
using System.Collections.Generic;

public class MainClass {
    public static void Main() {
        string[] presidents = {"G", "H", "java2s.com", "H", "over", "Jack"};
        bool any = presidents.Any(s => s.StartsWith("j"));
        Console.WriteLine(any);
    }
}

Any opeator and custom types

using System;//from   ja  v a  2 s .co  m
using System.Collections.Generic;
using System.Linq;
using System.Text;


class Customer
{
    public string ID { get; set; }
    public string City { get; set; }
    public string Country { get; set; }
    public string Region { get; set; }
    public decimal Sales { get; set; }
}
class Program
{
    static void Main(string[] args)
    {
        List<Customer> customers = new List<Customer> {
          new Customer { ID="P", City="Tehran", Country="Iran", Region="Asia", Sales=7000 },
          new Customer { ID="Q", City="London", Country="UK", Region="Europe", Sales=8000 },
          new Customer { ID="R", City="Beijing", Country="China", Region="Asia", Sales=9000 },
          new Customer { ID="T", City="Lima", Country="Peru", Region="South America", Sales=2002 }
       };

        bool anyUSA = customers.Any(c => c.Country == "USA");
        Console.WriteLine(anyUSA);
    }
}

Next chapter...

What you will learn in the next chapter: