C# – LINQ – Example for LINQ initialization

Posted on January 23, 2017 by

Lately I am interested in C# again and thus I have taken a deeper look at LINQ (Language Integrated Query). My previous article, concerning it was here.

I thought it was interesting, that the value in LINQ is calculated after it is used, and not after it’s time to be calculated.

Thus, if you take a look at the following simple example, you would see that col1 should not be containing the value of 1000, because it is added later.

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

namespace linqMe
{
    class linqMe
    {
        static void Main()
        {
            List  numbers = new List { 5,6,7,8,9,20};

            var col1 = from n in numbers
                                where n > 6
                                select n;

            numbers.Add(1000);
            foreach (var n in col1)
            {
                Console.WriteLine(n);
            }

        }
    }
}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace linqMe

{

class linqMe

{

static void Main()

{

List numbers = new List { 5,6,7,8,9,20};

var col1 = from n in numbers

where n > 6

select n;

numbers.Add(1000);

foreach (var n in col1)

{

Console.WriteLine(n);

}

However, if you simply run it, you get this:

And thus, you would see the 1000 inside. That’s how LINQ works! 🙂

Tagged with: C#, LINQ

C# – LINQ – Example for LINQ initialization

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