How to place routes with optional parameters Asp.net-core

Question

I wish my route was this way

 [HttpGet("APIPassword={APIPassword}/AvatarUUID={AvatarUUID}/Idioma?={Idioma}")]

Where Language is Optional

[HttpGet("APIPassword={APIPassword}/AvatarUUID={AvatarUUID}/{Idioma:string?}")]

But when I put the URL I really want to keep this format

Apipassword=blblb/Avataruuid=dfsafadsfasf/Language=en

The most concrete problem is that the Language can be entered

APIPassword=blblblb/AvatarUUID=dfsafadsfasf/Idioma=

And so I’m trying to solve the problem by making this parameter optional So I wanted to keep the Idiom= even if there is no value ahead

I wish it was possible to keep the url this way APIPassword=blblblb/AvatarUUID=dfsafadsfasf/Idioma=pt

But since Language may not bring value

APIPassword=blblblb/AvatarUUID=dfsafadsfasf/Idioma=

Answer 1

Just use the question mark in the parameter which can be optional. In the example below the id would be optional.

app.UseMvc(routes =>
{
    routes.MapRoute("default", "{controller=Home}/{action=Index}/{id?}");
});