Mastering minimal apis in asp net core pdf

Introduction

ASP.NET is a popular programming language used for developing web applications. It provides a powerful framework for dynamic and websites. One of the key features of ASP.NET is its ability to create minimal APIs, which allow developers to build lightweight and efficient web applications.

What are Minimal APIs?

Minimal APIs in ASP.NET Core are a new way of building web APIs with minimal code and configuration. They provide a simplified programming model that allows developers to focus on writing the essential code required to handle HTTP requests and responses.

Getting Started with Minimal APIs

To get started with minimal APIs in ASP.NET Core, you need to create a new or open an one. Once you have your project set up, you can start writing minimal APIs.


using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft..Hosting;

var builder = WebApplication.CreateBuilder(args);

var app = builder.Build();

app.MapGet("/", () => "Hello, World!");

app.Run();

In the above example, we create a new minimal API using the WebApplication.CreateBuilder() method. We then define a route using the app.MapGet() method, which handles GET requests to the root URL (“/”) and returns a simple “Hello, World!” message.

Routing and

Minimal APIs in ASP.NET Core also support routing and controllers, allowing you to organize your code and handle different HTTP methods and .


using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Hosting;

var builder = WebApplication.CreateBuilder(args);

var app = builder.Build();

app.MapGet("/", () => "Hello, World!");

app.MapPost("/api/users", (HttpContext context) =>
{
    // Handle POST  to create a new user
    return "User created successfully";
});

app.Run();

In the above example, we define a route for handling POST requests to “/api/users”. the route handler, you can write the code to handle the request and return an appropriate response.

Middleware and Dependency Injection

Minimal APIs in ASP.NET Core also support middleware and dependency injection, allowing you to add additional functionality and to your application.


using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Hosting;

var builder = WebApplication.CreateBuilder(args);

var app = builder.Build();

app.UseMiddleware();

app.MapGet("/", () => "Hello, World!");

app.Run();

public class CustomMiddleware
{
    private readonly RequestDelegate _next;

    public CustomMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task InvokeAsync(HttpContext context)
    {
        // Custom middleware logic
        await _next(context);
    }
}

In the above example, we add a custom middleware to the application using the method. The custom middleware class is responsible for handling the request and passing it to the next middleware in the pipeline.

Conclusion

Minimal APIs in ASP.NET Core provide a simplified and efficient way of building web applications. They allow developers to focus on writing the essential code required to handle HTTP requests and responses, without the need for complex configuration and boilerplate code. By leveraging minimal APIs, developers can create lightweight and performant web applications with ease.

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