Reader Level:
ARTICLE

Parallel LINQ in C#

Posted by Vijay Prativadi Articles | LINQ November 29, 2012
Today, in this article let's play around with one of the interesting and most useful concepts in C# with LINQ.
  • 0
  • 0
  • 6935

Introduction
 
Today, in this article let's play around with one of the interesting and most useful concepts in C# with LINQ.

Question: What is PLINQ?
 
In simple terms "It provides flexibility to perform parallelism with LINQ queries".

Step 1: Create a new WebForm project

New-project-in-ASP.NET.jpg

 Step 2: The complete code of WebForm1.aspx looks like this:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="PLINQApp.WebForm1" %>

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">

    <style type="text/css">

        .grid

        {

            margin-top: 50px;

        }

    </style>

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <center>

        <div>

            <table>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Label ID="Label1" runat="server" Text="Parallel LINQ" Font-Bold="true" Font-Size="Large"

                            Font-Names="Verdana" ForeColor="Maroon"></asp:Label>

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Button ID="Button1" runat="server" Text="Select Data" Font-Names="Verdana" Width="213px"

                            BackColor="Orange" Font-Bold="True" OnClick="Button1_Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:GridView ID="GridView1" runat="server" CssClass="grid" BackColor="LightGoldenrodYellow"

                            BorderColor="Tan" BorderWidth="1px" CellPadding="2" ForeColor="Black" GridLines="None">

                            <AlternatingRowStyle BackColor="PaleGoldenrod" />

                            <FooterStyle BackColor="Tan" />

                            <HeaderStyle BackColor="Tan" Font-Bold="True" />

                            <PagerStyle BackColor="PaleGoldenrod" ForeColor="DarkSlateBlue" HorizontalAlign="Center" />

                            <SelectedRowStyle BackColor="DarkSlateBlue" ForeColor="GhostWhite" />

                            <SortedAscendingCellStyle BackColor="#FAFAE7" />

                            <SortedAscendingHeaderStyle BackColor="#DAC09E" />

                            <SortedDescendingCellStyle BackColor="#E1DB9C" />

                            <SortedDescendingHeaderStyle BackColor="#C2A47B" />

                        </asp:GridView>

                    </td>

                </tr>

            </table>

        </div>

    </center>

    </form>

</body>

</html>

Step 3: The complete code of WebForm1.aspx.cs looks like this:
 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace PLINQApp

{

    public partial class WebForm1 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

        }

        protected void Button1_Click(object sender, EventArgs e)

        {

            var query = from r in objEntities.Employee.AsParallel()

                        where r.Age >= 20

                        select new

                            {

                                FirstName = r.FirstName,

                                LastName = r.LastName,

                                Age = r.Age

                            };

            GridView1.DataSource = query;

            GridView1.DataBind();

        }

        #region Instance

        MembersCompanyEntities objEntities = new CompanyEntities();

        #endregion

    }

}

Step 4: The output of the application looks like this:


Parallel-in-linq.jpg
Step 5: The correlate operation with Lambda output of the application looks like this:


Paralle-linq-output.jpg

COMMENT USING

Trending up