Lets Play Around With Builder Design Pattern

Vijay Prativadi
12y
5.3k
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Article

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 on a web app.

Question: What is Builder Pattern?

In simple terms "This patterns helps the construction of an object and its representations from a complex, cluttered environment to a simple, easy and understandable format. With the help of this pattern we can customize our objects and can be used accordingly towards the requirements".

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="BuilderDesignPatternApp.Default" %>

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

</head>

<body>

<div>

Builder Pattern - Design Patterns</h1>

<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>

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

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

</td>

</tr>

<tr>

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

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

</td>

</tr>

<tr>

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

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

</td>

</tr>

<tr>

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

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

</td>

</tr>

</table>

<table>

<tr>

<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 IArthmetic.cs looks like this:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace BuilderDesignPatternApp

{

public interface IArthmetic { double Arthmetic(double a, double b);}

}

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

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace BuilderDesignPatternApp

{

public class Addition : IArthmetic { public double Arthmetic(double a, double b) { return a + b; } }

}

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

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace BuilderDesignPatternApp

{

public class Substraction : IArthmetic { public double Arthmetic(double a, double b) { return a - b; } }

}

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

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace BuilderDesignPatternApp

{

    public class Multiplication : IArthmetic {
    public double Arthmetic(double a, double b)
   {
     return a * b;
    }
}

}

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

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace BuilderDesignPatternApp

{

public class Division : IArthmetic { public double Arthmetic(double a, double b) { return a / b; } }

}

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

using System;

using System.Globalization;namespace BuilderDesignPatternApp

{

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

{

protected void Page_Load(object sender, EventArgs e)

{

TextBox1.Focus();

}

protected void Button1Click(object sender, EventArgs e)

{

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

{

lblResult.Text = "Please Enter Some Values";

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

}

else

{

lblResult.Text = "Addition Result of <b>" + TextBox1.Text + "</b> and <b>" + TextBox2.Text +"</b> is <b>" + DoArthmetic(_objAddition).ToString(CultureInfo.InvariantCulture) + "</b>";

lblResult.ForeColor = System.Drawing.Color.Black;TextBox1.Text = "";

TextBox2.Text = "";

}

protected void Button2Click(object sender, EventArgs e)

{

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

{

lblResult.Text = "Please Enter Some Values";

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

}

else

{

lblResult.Text = "Substraction Result of <b>" + TextBox1.Text + "</b> and <b>" + TextBox2.Text +"</b> is <b>" + DoArthmetic(_objSubstraction).ToString(CultureInfo.InvariantCulture) + "</b>";

lblResult.ForeColor = System.Drawing.Color.Black;TextBox1.Text = "";

TextBox2.Text = "";

}

protected void Button3Click(object sender, EventArgs e)

{

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 of <b>" + TextBox1.Text + "</b> and <b>" + TextBox2.Text +"</b> is <b>" + DoArthmetic(_objMultiplication).ToString(CultureInfo.InvariantCulture) + "</b>";

lblResult.ForeColor = System.Drawing.Color.Black;TextBox1.Text = "";

TextBox2.Text = "";

}

protected void Button4Click(object sender, EventArgs e)

{

lblResult.Text = "";

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 of <b>" + TextBox1.Text + "</b> and <b>" + TextBox2.Text +"</b> is <b>"+DoArthmetic(_objDivision).ToString(CultureInfo.InvariantCulture)+"</b>";

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

TextBox1.Text = "";

TextBox2.Text = "";

}

private double DoArthmetic(IArthmetic arthmetic)

{

double d = arthmetic.Arthmetic(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text));

return d;

}

#region

Private Instance Variblesprivate readonly IArthmetic _objAddition = new Addition();

private readonly IArthmetic _objSubstraction = new Substraction();