CODEWITHSUNDEEP
asp.net-coreasp.net-mvc-routing
Trace
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Reputation: 51

Routing with optional values and default value

i am trying to implement a route with an optional value (language) and if it is not given by url, a default value for it, for example "de".

i have following test-controllers:

public IActionResult Index(string lang = "de")
{
    return View();
}

public IActionResult Privacy(string lang = "de")
{
    return View();
}

and following router configuration:

app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{lang?}/{action=Index}/{id?}");
            });

so my expected result should be:

path:                                expected invocation:                    actual invocation
localhost:44305/                 --> invoke Index(string lang = "de")    --> working
locahlhost:44305/home/en/index   --> invoke Index(string lang = "en")    --> working
localhost:44305/home/privacy     --> invoke Privcay(string lang = "de")  --> ERROR!!! invoking Index(string lang = "privacy") 
localhost:44305/home/de/privacy  --> invoke Privacy(string lang = "de")  --> working
localhost:44305/home/en/privacy  --> invoke Privacy(string lang = "en")  --> working

As you can see, i got the problem with the url ../home/privacy, cause the controller thinks, its my new language string.

Are there any suggestions how i can prevent it?

Upvotes: 0

Views: 369

Answers (1)

Rena
Rena

Reputation: 36645

Change your route template like below:

app.UseEndpoints(endpoints =>
{
    endpoints.MapControllerRoute(
        name: "default",
        pattern: "{controller=Home}/{action=Index}/{id?}");
    endpoints.MapControllerRoute(
        name: "lang",
        pattern: "{controller=Home}/{lang?}/{action=Index}/{id?}");
});

Upvotes: 1

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