LINQ TakeWhile Partition Operator

In LINQ, TakeWhile Operator is used to get the elements from the list/collection of the data source as long as the specified condition is holding the expression.

Syntax of LINQ TakeWhile Operator

The syntax of using the LINQ TakeWhile operator is to get the elements from the list, based on the specified condition.

C# Code

From the above syntax, we are getting the elements from the list where the elements starts with "U".

Example of LINQ TakeWhile in Method Syntax

Here is the example of using the LINQ TakeWhile in method syntax to get the elements from the list/collection.

C# Code

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
//Array countries is created of string type.
            string[] countries = { "US", "UK", "Russia", "China", "Australia", "Argentina" };
/*TakeWhile operator is used which will print 
the values until the specified condition is satisfied.*/
            IEnumerable<string> result = countries.TakeWhile(x => x.StartsWith("U"));
    //foreach loop will print the value of the result
            foreach (string s in  result) 
            {
                Console.WriteLine(s);
            }
                Console.ReadLine();
        }
    }
}

In the above example, we used TakeWhile () operator and a lambda expression in which we specified the condition which will select the countries that starts with "U." So, it returns only the first two elements.

OUTPUT:

Example of LINQ TakeWhile in Query Syntax

Here is the example of using the LINQ TakeWhile Operator in query syntax to get the elements from the list.

using System;
using System. Collections;
using System.Collections.Generic;
using System. Linq;
using System. Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] countries = { "US", "UK", "China", "Russia", "Argentina", "India" };
//apply the query syntax to print the values upto the specified condition.StartWith("U").
            IEnumerable<string> result = (from x in countries select x).TakeWhile(x => x.StartsWith("U"));
            foreach (string s in  result) 
            {
                Console.WriteLine(s);
            }
                Console.ReadLine();
        }
    }
}

OUTPUT:

After executing the above program, we get the output as shown below: