C# – First steps with C# and .NET – part 058. – free-tutorials.org news free tutorials source code development scripts

You can find some examples on my website using Linq, but today I will show the most simple example using this feature.
First, you need to take a look at the documentation page and read how this works.
This feature uses a query using three distinct steps of a LINQ query operation:

Obtain the data source
Create the query
Execute the query

I create a folder named LinqExample001 and I use this command to create a console application:

dotnet new console

1	dotnet new console

You don’t need to use install with dotnet because this package is set to default.
My source code example for calculating the average for an array comes with these parts: first is the basic calculation and the second one uses the LINQ feature:
This is the source code:

using System;
using System.Linq;
namespace LinkExample001
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] intNumbers = new int[] { 7, 3, 76};
            //Using the basic method Syntax
            var MAverageValue = intNumbers.Average();
            Console.WriteLine("Basic method : Average Value = " + MAverageValue);
            //Using Query syntax from Linq
            var LinqAverageValue = (from num in intNumbers
                                  select num).Average();
            Console.WriteLine("Linq method : Average Value = " + LinqAverageValue);
        }
    }
}

using System;

using System.Linq;

namespace LinkExample001

{

class Program

{

static void Main(string[] args)

{

int[] intNumbers = new int[] { 7, 3, 76};

//Using the basic method Syntax

var MAverageValue = intNumbers.Average();

Console.WriteLine("Basic method : Average Value = " + MAverageValue);

//Using Query syntax from Linq

var LinqAverageValue = (from num in intNumbers

select num).Average();

Console.WriteLine("Linq method : Average Value = " + LinqAverageValue);

}

The result of the running code is this:

Basic method : Average Value = 28.666666666666668
Linq method : Average Value = 28.666666666666668

1 2	Basic method : Average Value = 28.666666666666668 Linq method : Average Value = 28.666666666666668

The data source is the intNumbers.
You can see the LINQ query uses these words: from, in, select to create query.
The execution of the LINK query is the Average function.

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