The following post will cover routing, route handlers, route parameter for Web API in .NET 6

Routing

Supports both Map{Verb} and MapMethods

1var builder = WebApplication.CreateBuilder(args);
2var app = builder.Build();
3
4app.MapGet("/", () => "Routing using the GET");
5app.MapPost("/", () => "Routing using the POST");
6app.MapPut("/", () => "Routing using the PUT");
7app.MapDelete("/", () => "Routing using the DELETE");
8
9app.MapMethods("/options-or-head", new[] { "OPTIONS", "HEAD" }, 
10                          () => "Routing using an options or head request");
11
12app.Run();

Route Handlers

Route handlers let you define methods that execute when the route matches. It can be a lambda expression, a local function, an class method.

Lambda expression

1// Inline lambda expression
2app.MapGet("/inline", () => "Hello Linh.Work");
3
4// Variable lambda expression
5var handler = () => "Hello Linh.Work";
6app.MapGet("/", handler);

Local function

1// Local function using lambda
2string LocalFunction() => "Hello Linh.Work";
3app.MapGet("/", LocalFunction);
4
5// Another local function
6string AnotherLocalFunction() =>{
7    return "Hello Linh.Work";
8}
9app.MapGet("/", AnotherLocalFunction);

Class method

1// Declare a class for given method
2static class ClassHandler
3{
4    public static string Hello()
5    {
6        return "Hello Linh.Work";
7    }
8}
9
10// Using Instance method
11app.MapGet("/", ClassHandler.Hello);

Route Parameters

Route parameters are named URL segments that are used to capture the values specified at their position in the URL.

For example:

1app.MapGet("/hello/{name}", 
2    (string name) => $"Hello I'm {userId}");

The result will return Hello I'm Linh.Work if the url /hello/Linh.Work

That's it for now. Keep coding and enjoy exploring !!!

Nguyen Chi Linh

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I’m glad you’re here. I like the simple so I created this minimalist site to share what I’ve learned interesting during my journey in technologies and in life. Keep coding and enjoy exploring !!!