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

Routing

Supports both Map{Verb} and MapMethods

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var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.MapGet("/", () => "Routing using the GET");
app.MapPost("/", () => "Routing using the POST");
app.MapPut("/", () => "Routing using the PUT");
app.MapDelete("/", () => "Routing using the DELETE");

app.MapMethods("/options-or-head", new[] { "OPTIONS", "HEAD" }, 
                          () => "Routing using an options or head request");

app.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

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// Inline lambda expression
app.MapGet("/inline", () => "Hello Linh.Work");

// Variable lambda expression
var handler = () => "Hello Linh.Work";
app.MapGet("/", handler);

Local function

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// Local function using lambda
string LocalFunction() => "Hello Linh.Work";
app.MapGet("/", LocalFunction);

// Another local function
string AnotherLocalFunction() =>{
    return "Hello Linh.Work";
}
app.MapGet("/", AnotherLocalFunction);

Class method

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// Declare a class for given method
static class ClassHandler
{
    public static string Hello()
    {
        return "Hello Linh.Work";
    }
}

// Using Instance method
app.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:

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app.MapGet("/hello/{name}", 
    (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

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 !!!