1. ASP.NET Core Overview
Concept
ASP.NET Core is a cross-platform, open-source framework for building web applications, APIs, and microservices.
Real Example:
Creating a website that works on Windows, Linux, or macOS using one codebase.
2. Project Structure
Concept:
An ASP.NET Core project includes:
Program.cs→ Main startup logic (replaces Global.asax)appsettings.json→ ConfigurationControllers,Models,Views→ MVC structurewwwroot→ Static files (CSS, JS, images)
Examplewwwroot/css/site.css for styles, Controllers/HomeController.cs for logic.
3. Middleware Pipeline
Concept
Middleware are components executed in sequence to handle HTTP requests and responses.
Example
A request passes through middleware for Logging → Authentication → Routing → Response.
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.MapControllers();
4. Routing
Concept
Determines how URLs map to controllers and actions.
Example
URL /product/details/5 maps to:
[Route("product/details/{id}")]
public IActionResult Details(int id)
5. MVC Pattern
Concept
Model–View–Controller separates logic:
Model → Data structure
View → UI (HTML + Razor)
Controller → Handles user requests
ExampleTaskController → Controls all task operations.Task.cs → Holds task data.Index.cshtml → Displays task list.
6. Dependency Injection (DI)
Concept
ASP.NET Core provides built-in DI to manage object lifetimes and dependencies.
Example
builder.Services.AddScoped<ITaskService, TaskService>();
Then inject into controller:
public class TaskController : Controller
{
private readonly ITaskService _taskService;
public TaskController(ITaskService taskService)
{
_taskService = taskService;
}
}
7. Entity Framework Core (EF Core)
Concept
ORM (Object-Relational Mapper) that lets you interact with the database using C# classes instead of SQL.
Example
_context.Tasks.Add(new TaskItem { Title = "Fix Bug" });
await _context.SaveChangesAsync();
8. Configuration & Settings
Concept
All settings stored in appsettings.json — database strings, keys, URLs, etc.
Example
"ConnectionStrings": {
"DefaultConnection": "Server=.;Database=TaskDB;Trusted_Connection=True;"
}
9. Authentication & Authorization
Concept
Authentication: Verify who the user is
Authorization: Verify what they can access
Example
[Authorize(Roles="Admin")]
public IActionResult AdminPage() { ... }
10. Identity Framework
Concept
ASP.NET Core Identity provides login, registration, roles, and claims management.
Example
Built-in login pages using scaffolding:
dotnet aspnet-codegenerator identity -dc AppDbContext
11. Razor Pages & Razor Syntax
Concept
Razor = combination of HTML + C# for generating dynamic views.
Example
<p>Hello, @User.Identity.Name!</p>
12. Model Binding & Validation
Concept
Automatically maps form data to model objects and validates them.
Example
public class TaskModel
{
[Required]
public string Title { get; set; }
}
13. Filters
Concept
Filters run before or after actions (for logging, authorization, etc.)
Example
public class LogActionFilter : IActionFilter
{
public void OnActionExecuting(ActionExecutingContext context)
{
Console.WriteLine("Action starting...");
}
}
14. Tag Helpers
Concept
Enhance Razor markup with server-side logic.
Example
<form asp-controller="Task" asp-action="Create">
15. Web API & JSON
Concept
Build RESTful APIs to send/receive JSON.
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