C# – Routing optional parameters in ASP.NET MVC 5

asp.netasp.net-mvcasp.net-mvc-5crouting

I am creating an ASP.NET MVC 5 application and I have some issues with routing. We are using the attribute Route to map our routes in the web application. I have the following action:

[Route("{type}/{library}/{version}/{file?}/{renew?}")]
public ActionResult Index(EFileType type, 
                          string library, 
                          string version, 
                          string file = null, 
                          ECacheType renew = ECacheType.cache)
{
 // code...
}

We only can access this URL if we pass the slash char / in the end of url, like this:

type/lib/version/file/cache/

It works fine but does not work without /, I get a 404 not found error, like this

type/lib/version/file/cache

or this (without optional parameters):

type/lib/version

I would like to access with or without / char at the end of url. My two last parameters are optional.

My RouteConfig.cs is like this:

public class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapMvcAttributeRoutes();
    }
}

How can I solve it? Make the slash / be optional too?

Best Answer

Maybe you should try to have your enums as integers instead?

This is how I did it

public enum ECacheType
{
    cache=1, none=2
}

public enum EFileType 
{
    t1=1, t2=2
}

public class TestController
{
    [Route("{type}/{library}/{version}/{file?}/{renew?}")]
    public ActionResult Index2(EFileType type,
                              string library,
                              string version,
                              string file = null,
                              ECacheType renew = ECacheType.cache)
    {
        return View("Index");
    }
}

And my routing file

public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

    // To enable route attribute in controllers
    routes.MapMvcAttributeRoutes();

    routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional });
}

I can then make calls like

http://localhost:52392/2/lib1/ver1/file1/1
http://localhost:52392/2/lib1/ver1/file1
http://localhost:52392/2/lib1/ver1

http://localhost:52392/2/lib1/ver1/file1/1/
http://localhost:52392/2/lib1/ver1/file1/
http://localhost:52392/2/lib1/ver1/

and it works fine...

Related Solutions

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From the readme word doc for RC1 (not indexed by google)

ASP.NET Compiler Post-Build Step

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<Project ToolsVersion="3.5" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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For MVC v5.1 use Html.EnumDropDownListFor

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For MVC 5 and lower

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namespace MyApp.Common
{
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This allows you to write:

ViewData["taskStatus"] = task.Status.ToSelectList();

by using MyApp.Common