How to integrate Dependency Injection in ASP.Net Web Forms

The Dependency Injection is one of my favorite concept which enhances code re-usability and makes more object oriented. Today, we will learn about injecting the Dependency in ASP.Net Web Forms using Unity Container.

Dependency Injection is a Software design pattern which we use in C# to reduce class dependency.

The Unity Container (Unity) is a lightweight, extensible dependency injection container. As we know, there are many dependency injection containers and unity is one of them.

Steps to implement DI (Dependency Injection) in project are as follows:-

Step 1 – Create a new ASP.Net Web Forms project

Open the Visual Studio and create a new ASP.Net Web Forms Empty project as follows-

 

Step 2 – Create few folders

Create few folders in root directory of project and make your project’s solution directory look like this-

 

Step 3 – Add a new Model class

Create an User.cs model in Model folder and paste below codes-

public class User
 {
 public string Email { get; set; }
 public string FirstName { get; set; }
 public string LastName { get; set; }
 }

 

Step 4 – Add new interface

Add a new interface IUserRepository.cs  in IRepository  folder and paste below codes in that-

public interface IUserRepository
 {
 IEnumerable<User> GetUsers();
 }

 

Step 5 – Add new repository class

Add a new repository UserRepository.cs  in Repository  folder and paste below codes in that-

public class UserRepository : IUserRepository
 {
 IList<User> userList = new List<User>();
 public UserRepository()
 {
 User user = new User
 {
 Email = "jimcute8879@gmail.com",
 FirstName = "Jameer",
 LastName = "Khan"
 };
 userList.Add(user);
 }
 public IEnumerable<Model.User> GetUsers()
 {
 return userList;
 }
 }

 

Step 6 – Open Package Manager Console and install Unity.WebForms

Run below code in Package Manager Console in order to install the Unity Container-

Install-Package Unity.WebForms

 

It will add an ASP.Net folder in project and will add the Unity Container default class in that-

 

Step 7 – Register the Interface and Implementation classes

Register all your Interface and Implementation classes in UnityWebFormsStart.cs file.

private static void RegisterDependencies(IUnityContainer container)
 {
 // TODO: Add any dependencies needed here
 container.RegisterType<IUserRepository, UserRepository>();
 }

 

Step 8 – Call the interface in your Default.aspx file

[Dependency]
 public IUserRepository _userRepository { get; set; }
 protected void Page_Load(object sender, EventArgs e)
 {
 var users = _userRepository.GetUsers();
 }

 

Step 9 – View the injected dependency

Now run the project and you would see that it has injected the required dependency while running the project-

 

Visit my Github Repository here to download the full project.

Follow this tutorial to Integrate Dependency Injection in ASP.Net MVC.

Thanks for reading 🙂