Dependency Injection - NINJECT

_prnDrv = prnDrv;

}

public void PrintInfo()
{
_prnDrv.Print("John", "25", "123 Fake Street, Dallas", "xxx xxx xxxx");
}
}
}

Create a simple window forms, include Ninject.Core namespace, create an instance of CustomModule (bind IPrintDriver is to actual object). Create a kernel object of
type IKernel by passing CustomModule, get the handle and call its Print method:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using DICustomModule;
using Ninject.Core;

namespace PrintMyInfo
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
CustomModule module = new CustomModule();
IKernel kernel = new StandardKernel(module);
Print printMyInfo = kernel.Get();
printMyInfo.PrintInfo();
}
}
}

//This is entry point
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace PrintMyInfo
{
static class Program
{
///
/// The main entry point for the application.
///
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}

Now I need to print the output to text file (not PDF). Create another implementation of IPrintDriver:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using PrintInterface;

namespace PrintImplementation2
{
public class TextPrinter : IPrintDriver
{
public void Print(string Name, string Age, string Address, string Phone)
{
string printText = null;
printText = Name + ", " + Age + ", " + Address + ", " + Phone;
TextWriter tw = new StreamWriter("Print.txt");

// write a line of text to the file
tw.WriteLine(printText);

// close the stream
tw.Close();
}

}
}

Update the CustomModule and attach new object to IPrintDriver:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Ninject.Core;
using PrintInterface;
using PrintImplementation2;

namespace DICustomModule
{
public class CustomModule : StandardModule
{
public override void Load()
{

Bind( < IPrintDriver > ).To( < TextPrinter >);

}

}
}

All I needed to do was to update the intermediate layer (CustomModule). Main program doesn't need to be recompiled.

Isn't a simple approach!