ASP.NET MVC控制器参数可选的（即指数（INT？ID）） [英] ASP.NET MVC controller parameter optional (i.e Index(int? id))

问题描述

我有以下情形：我的网站上显示的文章

I have the following scenario: my website displays articles (inputted by an admin. like a blog).

所以要查看的文章，该用户被称为首页/文章/ {文章ID}

So to view an article, the user is referred to Home/Articles/{article ID}.

然而，用户选择从Articles.aspx视图本身内，以查看哪些物品，使用jsTree列表

However, the user selects which article to view from within the Articles.aspx view itself, using a jsTree list.

所以，我什么，我需要做的是要能两种情况之间区分：用户正在访问的具体条款，或者他只是想进入主的文章页面。我试着设置了公司章程的控制器参数可选（INT？ID），但后来我有使用值时，控制器内的ID问题。

So I what I need to do is to be able to differentiate between two cases: the user is accessing a specific article, or he is simply trying to access the "main" articles page. I tried setting the "Articles" controller parameter as optional (int? id), but then I am having problems "using" the id value inside the controller.

什么是最佳的方式来处理这种情况？也许我只是需要一个更好的逻辑，用于检查ID参数是否是在URL提供？

What is the optimal manner to handle this scenario? Perhaps I simply need a better logic for checking whether or not an id parameter was supplied in the "url"?

我试图避免使用两个视图/控制器，只需出code-重复的原因。

I am trying to avoid using two views/controllers, simply out of code-duplication reasons.

推荐答案

使用单独的操作，如：

public ActionResult Articles() ...
public ActionResult Article(int id) ...

另外，它移动到一个文章控制器（使用默认路由的网址是：文章和文章/详细信息/ {ID} ）

public class ArticlesController : Controller
{
    public ActionResult Index() ...
    public ActionResult Detail(int id) ...
}

如果你喜欢你贴仍然必须使用它，尝试下列操作之一：

If you still must use it like you posted, try one of these:

public ActionResult Articles(int id = 0)
{
     if(id == 0) {
         return View(GetArticlesSummaries());
     }
     return View("Article", GetArticle(id));
}
public ActionResult Articles(int? id)
{
     if(id == null) {
         return View(GetArticlesSummaries());
     }
     return View("Article", GetArticle(id.Value));
}

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