Define Entity Framework in .NET.

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Dependency Injection (DI) in .NET is a design pattern and technique used to achieve loose coupling between classes and their dependencies. Instead of a class creating its own dependencies, they are provided (injected) from the outside—typically by a DI container. This makes the application easier to maintain, test, and extend

Entity Framework (EF) in .NET is an Object-Relational Mapper (ORM) that allows developers to interact with a database using .NET objects instead of writing complex SQL queries directly.

It simplifies data access by mapping database tables to classes (called entities) and rows to objects, so developers can work with data in a more intuitive, object-oriented way.

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Key Features of Entity Framework:

1. Abstraction of Database Operations

   • Perform CRUD operations (Create, Read, Update, Delete) without writing SQL manually.

   • Example: Instead of writing SELECT * FROM Customers, you can use:

     var customers = db.Customers.ToList();
     

2. Modeling Data with Classes

   • Database tables → C# classes (entities).

   • Columns → Properties of those classes.

3. Database Approaches

   • Database First: Generate models from an existing database.

   • Code First: Create classes in code, and EF generates the database schema.

   • Model First: Design models visually, and EF generates both code and database.

4. LINQ Support

   • Query the database using Language Integrated Query (LINQ), which is strongly typed and easier to maintain.

5. Cross-Database Support

   • Works with SQL Server, MySQL, PostgreSQL, Oracle, and more (via providers).

6. Change Tracking

   • Automatically tracks modifications to entities and updates the database accordingly.

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Benefits of Entity Framework:

• Reduces boilerplate SQL code.

• Increases development speed.

• Easier maintenance and readability.

• Integrates seamlessly with ASP.NET Core applications.

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✅ In short: Entity Framework is the bridge between .NET applications and databases, letting developers focus on business logic instead of database query syntax.

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