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Let's Play Around With Adapter Design Pattern

Posted by Vijay Prativadi Articles | Design & Architecture June 10, 2012
Today, in this article let's play around with one of the interesting and most useful concepts of design patterns, which will be hosted in a web app.
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Introduction
 

Today, in this article let's play around with one of the interesting and most useful concepts of design patterns, which will be hosted in a web app.
 

Question: What is Adapter Pattern?

 

In simple terms "When working with incompatible interfaces, an adapter pattern helps to synchronize and make the classes compatible among each other".

 

I think we are now good to go and implement this wonderful concept.

 

Step 1: The complete code of Default.aspx looks like this:

 

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

 

<!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">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <h1 style="text-align: center; font-family: Verdana; font-size: large; color: Maroon">

            Adapter Pattern - Design Patterns</h1>

        <center>

            <table>

                <tr>

                    <td>

                        <asp:Label ID="Label1" runat="server" Text="Please Enter First Number" Font-Size="Small"

                            Font-Bold="true" Font-Italic="true" Font-Names="Verdana"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:Label ID="Label2" runat="server" Text="Please Enter Second Number" Font-Size="Small"

                            Font-Bold="true" Font-Italic="true" Font-Names="Verdana"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td colspan="2">

                        <asp:Button ID="Button1" runat="server" Text="Addition" Width="165px" Font-Names="Verdana"

                            BackColor="Orange" OnClick="Button1Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2">

                        <asp:Button ID="Button2" runat="server" Text="Subtraction" Width="165px" Font-Names="Verdana"

                            BackColor="Orange" OnClick="Button2Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2">

                        <asp:Button ID="Button3" runat="server" Text="Multiplication" Width="165px" Font-Names="Verdana"

                            BackColor="Orange" OnClick="Button3Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2">

                        <asp:Button ID="Button4" runat="server" Text="Division" Width="165px" Font-Names="Verdana"

                            BackColor="Orange" OnClick="Button4Click" />

                    </td>

                </tr>

            </table>

            <table>

                <tr>

                    <td colspan="2">

                        <asp:Label ID="lblResult" runat="server" Font-Names="Verdana"></asp:Label>

                    </td>

                </tr>

            </table>

        </center>

    </div>

    </form>

</body>

</html>

 

Step 2: The complete code of IAdd.cs looks like this:

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace AdapterDesignPatternApp

{

    public interface IAdd { void Add();}

}

 

 

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

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace AdapterDesignPatternApp

{

    public interface ISub { void Sub();}

} 
 

Step 4: The complete code of IMul.cs looks like this:

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace AdapterDesignPatternApp

{

    public interface IMul { void Mul();}

}

 

Step 5: The complete code of IDiv.cs looks like this:


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace AdapterDesignPatternApp
{
    public interface IDiv { void Div();}
}

 

Step 6: The complete code of MyAddition.cs looks like this:


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace AdapterDesignPatternApp
{
    public class MyAddition { public double Addition(double a, double b) { return a + b; } }
}

 

Step 7: The complete code of MySubtraction.cs looks like this:


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace AdapterDesignPatternApp
{
    public class MySubtraction { public double Subtraction(double a, double b) { return a - b; } }
}
 
 

Step 8: The complete code of MyMultiplication.cs looks like this:

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace AdapterDesignPatternApp

{

    public class MyMultiplication { public double Multiplication(double a, double b) { return a * b; } }

}
 

Step 9: The complete code of MyDivision.cs looks like this:
 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace AdapterDesignPatternApp

{

    public class MyDivision { public double Division(double a, double b) { return a / b; } }

}

 

Step 10: The complete code of Default.aspx.cs looks like this:

 

using System;

using System.Globalization;

namespace AdapterDesignPatternApp

{

    public partial class Default : System.Web.UI.Page, IAdd, ISub, IMul, IDiv

    {

        protected void Page_Load(object sender, EventArgs e){TextBox1.Focus();

        }

        protected void Button1Click(object sender, EventArgs e){Add();

        }

        protected void Button2Click(object sender, EventArgs e){Sub();

        }

        protected void Button3Click(object sender, EventArgs e){Mul();

        }

        protected void Button4Click(object sender, EventArgs e){Div();

        }

        public void Add()

        {

            if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text)){lblResult.Text = "Please Enter Some Values";

                lblResult.ForeColor = System.Drawing.Color.Red;

                {

                    lblResult.Text = "Addition Result is: <b>"+TextBox1.Text+"</b>"+" and "+TextBox2.Text+" is <b>"+_objAddition.Addition(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)).ToString(CultureInfo.InvariantCulture)+"</b>";

                    lblResult.ForeColor = System.Drawing.Color.Green;TextBox1.Text = "";TextBox2.Text = "";

                }

            }

            public void Sub()

            {

                if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text)){lblResult.Text = "Please Enter Some Values";

                    lblResult.ForeColor = System.Drawing.Color.Red;

                }

                else

                {

                    lblResult.Text = "Subtraction Result is: <b>" + TextBox1.Text + "</b>" + " and " + TextBox2.Text + " is <b>" + _objSubtraction.Subtraction(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)).ToString(CultureInfo.InvariantCulture) + "</b>";lblResult.ForeColor = System.Drawing.Color.Green;TextBox1.Text = "";

                    TextBox2.Text = "";

                }

            }

        public void Mul()

        {

            if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text)){lblResult.Text = "Please Enter Some Values";

                lblResult.ForeColor = System.Drawing.Color.Red;

            }

            else{lblResult.Text = "Multiplication Result is: <b>" + TextBox1.Text + "</b>" + " and " + TextBox2.Text + " is <b>" + _objMultiplication.Multiplication(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)).ToString(CultureInfo.InvariantCulture) + "</b>";

                lblResult.ForeColor = System.Drawing.Color.Green;TextBox1.Text = "";TextBox2.Text = "";

            }

       

        }public void Div()

        {

            if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text))

            {

                lblResult.Text = "Please Enter Some Values";

                lblResult.ForeColor = System.Drawing.Color.Red;

            }

            else

            {

                lblResult.Text = "Division Result is: <b>" + TextBox1.Text + "</b>" + " and " + TextBox2.Text + " is <b>" + _objDivision.Division(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)).ToString(CultureInfo.InvariantCulture) + "</b>";

                lblResult.ForeColor = System.Drawing.Color.Green;

                TextBox1.Text = "";TextBox2.Text = "";

            }

        }

        #region Private Instance Variablesprivate readonly MyAddition _objAddition = new MyAddition();

        private readonly MySubtraction _objSubtraction = new MySubtraction();

        private readonly MyMultiplication _objMultiplication = new MyMultiplication();

        private readonly MyDivision _objDivision = new MyDivision();#endregion

    }

 

 

Step 11: The output of the application looks like this:


 

Output1.png
 


 

Step 12: The output of the nothing entered application looks like this:


 

Output2.png

 

Step 13: The output of the addition operation application looks like this:


 

Output3.png
 

 

Step 14: The output of the multiplication operation application looks like this:

  Output4.png

I hope this article is useful for you.

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