Invoke ASP.Net Core MVC controller action with parameter doesn't work

Question

I have a simple ASP.NET Core MVC controller action method defined as:

public class MyMVCController : Controller
{
    public async Task MyAction(String usrid)
    {
        // ...
    }
}

When I call it using this URI:

https://localhost:6009/MyMVC/MyAction/073214df

My action gets invoked and I get return back, but the parameter usrid is always null. What am I doing wrong?

UPDATE

@Jackdaw's first solution, change parameter name from usrid to id worked for me. However, the ones with attributes don't. While the parameter does get passed in, the action will fail because the accessToken somehow returns null in the line below. This is not the case in the first solution.

[Route("MyMVC/MyAction/{usrid?}")]
public async Task MyAction(String usrid)
{
        var accessToken = await HttpContext.GetTokenAsync("access_token");
        var client = new HttpClient();
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
        // ...
}

Finally, I figured out how to get the attribute based routing solutions to work - adding another attribute [Authorize] to the action method. Don't ask me why I have to do this and why I don't in the usrid/id solution.

user_6630084 · Answer

It`s because the default route pattern has the following definition:

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

Therefore, if change the method parameter name to id it will work:

public async Task MyAction(String id)

Or you can apply the following route attribute to the method:

[Route("MyMVC/MyAction/{usrid?}")]
public async Task MyAction(String usrid)
{
    // ...
}

Test screenshot:

Invoke ASP.Net Core MVC controller action with parameter doesn't work

1 Answers