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Describe dependency injection in Asp.Net Core MVC in English and Hindi
Dependency injection in Engilsh
Dependency Injection (DI) is a design pattern commonly used in software development to manage and provide dependencies or services required by a component or class. In ASP.NET Core MVC, Dependency Injection plays a pivotal role in organizing and maintaining the application's architecture, making it more modular, testable, and maintainable.
Here's a detailed description of Dependency Injection in ASP.NET Core MVC:
What is Dependency Injection?
Dependency Injection is a technique that promotes the inversion of control by allowing you to inject dependencies (e.g., services, objects, or components) into your classes or controllers, rather than letting them create or manage those dependencies themselves. This decouples the components and simplifies testing, reuse, and maintenance.
Why is Dependency Injection Important in ASP.NET Core MVC?
In ASP.NET Core MVC, Dependency Injection is essential for several reasons:
Modularity: It encourages breaking down your application into smaller, more manageable and reusable components, making it easier to maintain and extend.
Testability: By injecting dependencies, you can easily replace real services with mock or stub implementations for unit testing. This facilitates writing unit tests for your controllers and other components.
Flexibility: It enables you to change or upgrade components without having to modify the dependent classes, as long as the interfaces (contracts) remain the same.
How Does Dependency Injection Work in ASP.NET Core MVC?
In ASP.NET Core MVC, the framework provides a built-in container for managing and resolving dependencies. This container is configured in the Startup.cs file. Here's a high-level overview of how it works:
Service Registration: In the Startup class, you configure the services (dependencies) your application needs by adding them to the built-in dependency injection container. This is typically done in the ConfigureServices method. For example:
In this example, IMyService is an interface, and MyServiceImpl is a concrete implementation. You are telling the DI container to use MyServiceImpl whenever IMyService is requested.
Service Consumption: In your controllers or other components, you declare dependencies via constructor injection or method injection. For instance:
Here, the IMyService dependency is injected into the MyController class through its constructor.
Resolution: When a request is made to your application, ASP.NET Core MVC automatically resolves the required services and passes them to the appropriate controllers or components.
Lifetime Management: When registering services, you can specify their lifetime, such as Singleton, Scoped, or Transient. This determines how long a service instance is kept in memory. For example:
Singleton: A single instance is created and shared across all requests.
Scoped: A new instance is created for each HTTP request.
Transient: A new instance is created every time it's requested.
Custom Dependencies: You can also register your own custom dependencies, not just framework-provided services.
In summary, Dependency Injection in ASP.NET Core MVC helps you organize, manage, and inject dependencies into your application components, promoting modularity, testability, and maintainability. It's a crucial aspect of building robust and scalable web applications in the ASP.NET Core framework.
Dependency injection in Hindi
Dependency Injection (DI) ek design pattern hai, aur yah ek tareeka hai jisse hum apne software applications me dependencies (jaise services ya objects) ko manage aur provide kar sakte hain. ASP.NET Core MVC me Dependency Injection ek mahatvapurna bhaag hai jo aapke application ki architecture ko organize aur maintain karne me madadgar hota hai, isse application ko modular, testable, aur maintainable banaya ja sakta hai.
Yahan ASP.NET Core MVC me Dependency Injection ke baare me ek vistaar se samjhaav diya gaya hai:
1. Dependency Injection Kya Hai?
Dependency Injection ek aisi technique hai jo control ki ultanee ko badhava dene me madad karti hai, jisme aap dependencies (jaise ki services, objects, ya components) ko apne classes ya controllers me inject kar sakte hain, isse unhe khud hi create ya manage karne se bachaya ja sakta hai. Isse components ko alag-alag kar diya jata hai aur testing, reuse, aur maintenance ko aasan banaya jata hai.
2. Dependency Injection ASP.NET Core MVC Me Kyon Mahatvapurna Hai?
ASP.NET Core MVC me Dependency Injection kai karanon se mahatvapurna hai:
Modularity (Modular Banao): Yeh aapko aapke application ko chhote aur manageable components me todne aur unhe dobara upayogshil aur maintainable banane ke liye protsahit karta hai.
Testability (Testable Banao): Dependencies ko inject karke aap aasani se unit testing ke liye real services ke sthan par mock ya stub implementations ka upayog kar sakte hain. Isse aapke controllers aur doosre components ke liye unit tests likhna aasan ho jata hai.
Flexibility (Lachilapan): Yeh aapko components ko bina dependent classes ko modify karne ke bina badalne ya upgrade karne ki anumati deta hai, basantu interfaces (contracts) wahi rahne chahiye.
3. Dependency Injection ASP.NET Core MVC Me Kaise Kaam Karta Hai?
ASP.NET Core MVC me, framework ek built-in dependency injection container pradan karta hai jisse dependencies ko manage aur resolve karne ke liye istemal kiya jata hai. Yeh container Startup.cs file me configure hota hai. Neeche iska kaam kaise karta hai uska ek uchch star par vistaar hai:
Service Registration (Service Panjikaran): Startup class me, aap apne application ke liye zaroori services (dependencies) ko configure karte hain, inhe built-in dependency injection container me add karte hain. Aam taur par is kaam ko ConfigureServices method me kiya jata hai. Example:
Is udaharan me, IMyService ek interface hai, aur MyServiceImpl ek concrete implementation hai. Aap DI container ko batate hain ki jab bhi IMyService ki darkhwast hoti hai to MyServiceImpl ka upayog karna hai.
Service Consumption (Service Upayog): Aapke controllers ya doosre components me, aap dependencies ko constructor injection ya method injection ke madhyam se declare karte hain. Uddharan ke liye:
Is udaharan me, IMyService dependency MyController class ke constructor ke madhyam se inject ki jati hai.
Resolution (Samadhan): Jab koi request aapke application me ki jati hai, tab ASP.NET Core MVC apne aap zaroori services ko resolve karti hai aur unhe samvedanit controllers ya components me bhejti hai.
4. Jivan Samay Prabandhan (Lifetime Management): Services ko register karte samay, aap unki jivan samay ko specify kar sakte hain, jaise ki Singleton, Scoped, ya Transient. Isse yah nischit hota hai ki ek service ki ek sthapana kitne samay tak memory me rakhi jati hai. Example:
Singleton: Ek single sthapana bani hoti hai aur yah sabhi darkhwaston me saanjha ki jati hai.
Scoped: Har HTTP request ke liye ek nayi sthapana bani hoti hai.
Transient: Har bar jab iski darkhwast hoti hai, tab ek nayi sthapana bani hoti hai.
5. Custom Dependencies (Custom Dependencies): Aap sirf framework pradan kie gaye services ke alawa aapki khud ki custom dependencies ko bhi register kar sakte hain.
Saransh me, ASP.NET Core MVC me Dependency Injection aapke application ke components ko organize, manage, aur inject karne me madadgar hota hai, jo ki modular, testable, aur maintainable banane me madad karta hai. Yah ASP.NET Core framework me mazboot aur scalable web applications banane ke liye ek mahatvapurna pehlu hai.
Thank You
About Author
Brijesh Kumar
Database Developer
I have more then 6 years Experience in Microsoft Technologies - SQL Server Database, ETL
Azure Cloud - Azure SQL Database, CosmosDB, Azure Data Factory, PowerBI, Web Job, Azure Function, Azure Storage, Web Apps, Powershall
and Database Migration On-Premise to Azure Cloud.
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