Csharp/CSharp Tutorial/LINQ/All

All method

using System;
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 allAsia = customers.All(c => c.Region == "Asia");
            Console.WriteLine (allAsia);
        }
    }

All with condition

using System;
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, 56, 102 };
       Console.Write(numbers.All(e => e % 2 == 0) ? "Yes, they are" : "No, they aren"t");
   }
}

All with Predicate to Return True

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
    public static void Main() {
        string[] presidents = {"G123456", "H", "a", "H", "over", "Jack"};
        bool all = presidents.All(s => s.Length > 5);
        Console.WriteLine(all);
    }
}

All with string length

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
    public static void Main() {
        string[] presidents = {"G", "H", "a", "H", "over", "Jack"};
        bool all = presidents.All(s => s.Length > 3);
        Console.WriteLine(all);
    }
}

Using All to determine whether an array contains only odd numbers.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class MainClass {
    public static void Main() {
        int[] numbers = { 1, 11, 3, 19, 41, 65, 19 };
        bool onlyOdd = numbers.All(n => n % 2 == 1);
        Console.WriteLine("The list contains only odd numbers: {0}", onlyOdd);
    }
}