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POHow to use route parameters in controller actions?
 

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  1. POHow to use route parameters in controller actions?
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    <p>I am very new to routing in ASP.NET MVC so bare with me. </p> <p>I have the following controller:</p> <pre><code> public ActionResult Index(int? categoryId) { IList&lt;Item&gt; result = categoryId == null ? _itemsService.GetLast(20) : _itemsService.GetByCategory((int)categoryId); var viewModel = Mapper.Map&lt;IList&lt;Item&gt;, IList&lt;ItemsIndexViewModel&gt;&gt;(result); return View(viewModel); } </code></pre> <p>The nullable categoryId parameter refers to the id of a sub-category. In case nothing was passed, the last 20 items must be displayed, but if a sub-category id was passed, the items from that category should be displayed.</p> <p>But what I'm trying to go for is: <code>www.myDomain.com/Category/SubCategory</code> (ex: <code>/Electronics/Cell-Phones</code>)</p> <p>My attempt at writing a route is this:</p> <pre><code> routes.MapRoute( "ItemIndex", "{category}/{subcategory}", new {controller = "Item", action = "Index", categoryId = UrlParameter.Optional} ); </code></pre> <p>But I have no idea how to pass the values of the category and subcategory.</p> <p>Any help would be appreciated :)</p> <p><strong>UPDATE:</strong> Here are the route definitions I've got so far:</p> <pre><code> public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.IgnoreRoute("{*favicon}", new { favicon = @"(.*/)?favicon.([iI][cC][oO]|[gG][iI][fF])(/.*)?" }); routes.MapRoute( "ItemDetail", "Item/Detail/{itemId}", new { controller = "Item", action = "Detail" } ); routes.MapRoute( "ItemIndex", "Items/{category}/{subcategory}", new { controller = "Item", action = "Index", subcategory = UrlParameter.Optional } ); routes.MapRoute( "Default", // Route name "{controller}/{action}/{id}", // URL with parameters new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults ); } </code></pre> <p>This is my controller I wish to map the route to:</p> <pre><code> public ActionResult Index(string category, string subcategory) { // IList&lt;Item&gt; result = string.IsNullOrEmpty(subcategory) ? _itemsService.GetLast(20) : _itemsService.GetByCategory(subcategory); IList&lt;Item&gt; result; if (string.IsNullOrEmpty(subcategory)) { if (string.IsNullOrEmpty(category)) { result = _itemsService.GetLast(20); } else { result = _categoryService.GetItemsInTopLevel(category); } } else { result = _itemsService.GetByCategory(subcategory); } var viewModel = Mapper.Map&lt;IList&lt;Item&gt;, IList&lt;ItemsIndexViewModel&gt;&gt;(result); return View(viewModel); } </code></pre> <p>And here's how I'm calling it from the View:</p> <pre><code>@model IList&lt;Sharwe.MVC.Models.ParentCategory&gt; &lt;div id="sharwe-categories"&gt; &lt;ul class="menu menu-vertical menu-accordion"&gt; @foreach(var topLevel in Model) { &lt;li class="topLevel"&gt; &lt;h3&gt; @Html.ActionLink(topLevel.Name, "Index", "Item", new { category = topLevel.Name }, new {@class = "main"} ) &lt;a href="#" class="drop-down"&gt;&lt;/a&gt; &lt;/h3&gt; &lt;ul&gt; @foreach (var childCategory in topLevel.Children) { &lt;li&gt;@Html.ActionLink(childCategory.Name, "Index", "Item", new RouteValueDictionary{ { "category" , topLevel.Name }, { "subcategory" , childCategory.Name }})&lt;/li&gt; } &lt;/ul&gt; &lt;/li&gt; } &lt;/ul&gt; &lt;/div&gt; </code></pre> <p>When I click on a top level category, it works perfectly fine. But clicking on the sub-categories does not work. It actually redirects to <code>http://localhost/?Length=4</code>. I have no idea where this is coming from... </p>
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    1. USKassem
    1. USKassem
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      1. POHow to use route parameters in controller actions?
      1. USAndrew
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      1. POHow to use route parameters in controller actions?
      1. USRafael Mueller
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    1. COdon't you think your route will match Home/create url as well or i m missing something?
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      1. POHow to use route parameters in controller actions?
      1. USMuhammad Adeel Zahid
    2. CO@Muhammad Adeel Zahid: Actually I think it does. Right now, I was debugging and I noticed the Home/Index got triggered right away... Why is that happening and how can I prevent it?
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      1. POHow to use route parameters in controller actions?
      1. USKassem
    3. COYou will probably have to use some route constraints as well. It's usually easier to make route definition similar to `category/{category}/{subcategory}` so it will be much easier to constraint it.
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      1. POHow to use route parameters in controller actions?
      1. USRobert Koritnik
 

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