CODEWITHSUNDEEP
c#asp.net-core
MingHong Zheng
MingHong Zheng

Reputation: 185

tag helpers is wrong route link using net core 3.1 LTS

I use ASP.NET Core 3.1 LTS and route setting like this

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

                endpoints.MapControllerRoute(
                    name: "Backend",
                    pattern: "{area:exists}/{controller=Home}/{action=Index}");

                 endpoints.MapRazorPages();
            });

and my areas razor page have a tag helper

<a class="btn btn-primary btn-sm" asp-area="Backend" asp-controller="Article" asp-action="Create"> Create</a>

usually this link will be /backend/article/create

but result is /article/create?area=backend

why result is wrong ?

Upvotes: 0

Views: 199

Answers (1)

itminus
itminus

Reputation: 25380

  1. The registering order of routes matters. 

    app.UseEndpoints(endpoints =>
{
    // register this route before the default one
    endpoints.MapControllerRoute(
        name: "Backend",
        pattern: "{area:exists}/{controller=Home}/{action=Index}");
    endpoints.MapControllerRoute(
        name: "default",
        pattern: "{controller=Home}/{action=Index}/{id?}");
     endpoints.MapRazorPages();
});

  2. Make sure the area of Backend exists. Otherwise, it will be treated as querystring. For example, if you have already had an Area of Backend(Need to use the standard Area Folder Structure + Namespace, and annotate the controller with [Area("Backend")], see official docs)

    [Area("Backend")]      // important
public class ArticleController : Controller  
{
    public IActionResult Create(){ ...}

    then the following code 

    <a asp-area="Backend" asp-controller="Article" asp-action="Create"> Create</a>
<a asp-area="AnAreaThatDoesnotExist" asp-controller="Article" asp-action="Create"> Create</a>

    will generate routes as below:

    <a href="/Backend/Article/Create"> Create</a>
<a href="/Article/Create?area=AnAreaThatDoesnotExist"> Create</a>

    Note we specify an parameter of area=AnAreaThatDoesnotExist which doesn't exist at all and then the area=AnAreaThatDoesnotExist will be used as query string.

Upvotes: 2

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