ASP.NET CORE MVC Advance Knowledge

• Data Annotations: These are attributes that can be applied to model properties to enforce validation rules. For example, [Required], [StringLength], [Range], etc.
• Fluent Validation: Instead of data annotations, you can use FluentValidation, a popular library for building strongly-typed validation rules for your models.
• Model Binding: ASP.NET Core’s model binding system automatically maps data from HTTP requests to action method parameters. You can customize model binding by implementing custom model binders or using attributes like [FromQuery], [FromBody], [FromRoute], etc.
• ViewModels: These are specialized models that represent the data structure needed for a specific view. ViewModels often combine multiple domain models and additional logic to shape the data for the view.
• DTOs (Data Transfer Objects): DTOs are used to transfer data between layers, particularly in cases where you want to avoid exposing your domain models directly to the client. They are similar to ViewModels but more focused on data transfer rather than presentation logic.

• Partial Views: These are reusable views that can be embedded within other views. They are helpful for breaking down complex UIs into smaller, manageable components.
• View Components: View components are more powerful than partial views. They allow you to encapsulate rendering logic and can be reused across multiple views. They have their own action method and can pass parameters to customize their output.
• Razor Pages: While not strictly part of MVC, Razor Pages offer a page-based model that makes building simple page-centric applications quicker and more intuitive. Razor Pages can be a good choice for creating small applications or pages with minimal logic.
• Tag Helpers: Tag Helpers enable server-side code to participate in creating and rendering HTML elements in Razor files. They provide a cleaner and more readable syntax for incorporating server-side logic in the markup.
• Sections and Layouts: Razor layouts allow you to define a consistent look and feel for your site. You can use sections to define parts of a page that can be overridden in derived views.

• Dependency Injection (DI): ASP.NET Core has built-in support for dependency injection, allowing you to inject services like logging, data access, or custom business services directly into controllers.
• Action Filters: Action filters are used to run code before or after executing an action method. They are great for cross-cutting concerns like logging, caching, or error handling. You can create custom action filters by implementing the IActionFilter interface.
• Routing: ASP.NET Core offers a powerful routing system that supports attribute routing and conventional routing. Attribute routing allows for more fine-grained control over URL generation and mapping.
• Asynchronous Actions: Controllers in ASP.NET Core can have asynchronous action methods using the async and await keywords. This is particularly useful for I/O-bound operations to improve scalability and responsiveness.
• Middleware Integration: Controllers can work with middleware components that run before and after them. Middleware is a powerful way to handle cross-cutting concerns globally in your application pipeline.
• Global Exception Handling: Instead of handling exceptions within each controller, you can use middleware to handle exceptions globally, providing a consistent error-handling mechanism.

• Testing: ASP.NET Core MVC applications are easily testable due to their decoupled architecture. You can write unit tests for your controllers, models, and views using popular testing frameworks like xUnit or MSTest.
• Custom Model Validation: Beyond simple data annotations, you can implement custom validation logic by implementing the IValidatableObject interface or creating custom validation attributes.
• Security: ASP.NET Core MVC provides features like anti-forgery tokens, data protection, authorization policies, and CORS to help secure your application.
• Caching: ASP.NET Core supports caching at various levels, including in-memory caching, distributed caching, and response caching, to improve the performance of your application.

1.  Separation of Concerns: Keep your controllers thin by moving business logic to services or the model layer.
2.  Use ViewModels: Create ViewModels specific to your views instead of passing domain models directly to the view.
3.  Leverage Dependency Injection: Use DI for injecting dependencies and managing object lifetimes.
4.  Avoid Fat Models: Keep models focused on business logic and data representation, not on view-related logic.
5.  Utilize Tag Helpers and View Components: These can significantly simplify your views and promote reuse.