Let's Play Around With Factory Method Design Pattern

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;namespace FactoryMethodPatternApplication

{

public class ClassAdd:IAdd{public double Add(double a, double b){return a + b;}}

}

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

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;namespace FactoryMethodPatternApplication

{

public class ClassSub:ISub{public double Sub(double a, double b){return a - b;}}

}

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

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;namespace FactoryMethodPatternApplication

{

public class ClassMul:IMul{public double Mul(double a, double b){return a * b;}}

}

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

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;namespace FactoryMethodPatternApplication

{

public class ClassDiv:IDiv{public double Div(double a, double b){return a / b;}}

}

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

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;namespace FactoryMethodPatternApplication

{

public interface IFactoryMethodArthmetic{IAdd Add();ISub Sub();IMul Mul();IDiv Div();}

}

Step 11: The complete code of FactoryMethodArthmetic.cs looks like this:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;namespace FactoryMethodPatternApplication

{

public class FactoryMethodArthmetic:IFactoryMethodArthmetic{public IAdd Add(){return new ClassAdd();}public ISub Sub(){return new ClassSub();}public IMul Mul(){return new ClassMul();}public IDiv Div(){return new ClassDiv();}}

}

Step 12: The complete code of Default.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 FactoryMethodPatternApplication

{

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

{

protected void Page_Load(object sender, EventArgs e)

{

}

public void Button1_Click(object sender, EventArgs e)

{ AddData();

}

public void Button2_Click(object sender, EventArgs e) { SubData();

}

public void Button3_Click(object sender, EventArgs e)

{

MulData();

}

public void Button4_Click(object sender, EventArgs e)

{

DivData();

}

public void AddData()

{

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

{

lblResult.Text = "Please Enter Some Values";

}

else

{

IFactoryMethodArthmetic objArthmetic = new FactoryMethodArthmetic(); IAdd addFactory; addFactory = objArthmetic.Add(); lblResult.Text = "Addition Result of " + TextBox1.Text + " and " + TextBox2.Text + " is: <b>" + addFactory.Add(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)) + "</b>"; TextBox1.Text = ""; TextBox2.Text = "";

}

} public void SubData()

{

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

{

lblResult.Text = "Please Enter Some Values";

}

else

{ IFactoryMethodArthmetic objArthmetic = new FactoryMethodArthmetic(); ISub subFactory; subFactory = objArthmetic.Sub(); lblResult.Text = "Subtraction Result of " + TextBox1.Text + " and " + TextBox2.Text + " is: <b>" + subFactory.Sub(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)) + "</b>"; TextBox1.Text = ""; TextBox2.Text = "";

}

} public void MulData()

{

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

}

else

{

IFactoryMethodArthmetic objArthmetic = new FactoryMethodArthmetic(); IMul mulFactory; mulFactory = objArthmetic.Mul(); lblResult.Text = "Multiplication Result of " + TextBox1.Text + " and " + TextBox2.Text + " is: <b>" + mulFactory.Mul(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)) + "</b>"; TextBox1.Text = ""; TextBox2.Text = "";

}

}

public void DivData()

{

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

}

else

{

IFactoryMethodArthmetic objArthmetic = new FactoryMethodArthmetic(); IDiv divFactory; divFactory = objArthmetic.Div(); lblResult.Text = "Division Result of " + TextBox1.Text + " and " + TextBox2.Text + " is: <b>" + divFactory.Div(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)) + "</b>"; TextBox1.Text = ""; TextBox2.Text = "";

}

}

}

}

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

Step 14: The output of the nothing entered application looks like this:

Step 15: The output of the addition operation application looks like this:

Step 16: The output of the division operation application looks like this:

I hope this article is useful for you. I look forward for your comments and feedback.