§8.3  Generating Outgoing URLs

从前, 如果你要从detail.aspx页面中查找一个id参数, 你会这么写

myHyperLink.NavigateUrl = "~/Details.aspx?id=" + itemID;
但是, 现在我们只需要这样写:
<a href="/Products/Details/<%: ViewData["ItemID"] %>">More details</a>

 

§8.3.1  Generating Hyperlinks with Html.ActionLink()

最简单的产生url的方式就是从一个视图模板调用Html.ActionLink().比如:

<%: Html.ActionLink("See all of our products", "List", "Products") %>

它的实现效果如下

<a href="/Products/List">See all of our products</a>

注意, 这里如果你没有指定controller, 他会默认你当前的controller

 

Passing Extra Parameters

你可以传递额外的route入口需要的参数.

<%: Html.ActionLink("Red items", "List", "Products",new { color="Red", page=2 }, null) %>

它的实现效果:

<a href="/Products/List?color=Red&amp;page=2">Red items</a>

如果,你的route配置中有这样的配置方式Products/List/{color}/{page},那么就会产生如下的代码

<a href="/Products/List/Red/2">Red items</a>

 

How Parameter Defaults Are Handled

当我们写下下面的代码的时候, 而且product的默认action是index

<%: Html.ActionLink("Products homepage", "Index", "Products") %>

它的实现效果如下

<a href="/Products">Products homepage</a>

这里因为默认情况下相同, 所以省略了index

 

Generating Fully Qualified Absolute URLs

Html.ActionLink() 通常生成的是URL的一部分,(i.e. /Products,而不是http://www.example.com/Products). 如果你想生成一个完整的URL, 如下:

<%: Html.ActionLink("Click me", "MyAction", "MyController", "https",
	"www.example.com", "anchorName", new { param = "value" },
	new { myattribute = "something" }) %>

它的效果如下:

<a myattribute="something" href="https://www.example.com/MyController/MyAction?param=value#anchorName">Click me</a>
 

§8.3.2 Generating Links and URLs from Pure Routing Data

Html.RouteLink() 和 Html.ActionLink() 是类似的.

<%: Html.RouteLink("Click me", new { controller = "Products", action = "List" }) %>

它会产生如下的链接

<a href="/Products/List">Click me</a>
同样的,Url.RouteUrl() 和Url.Action() 是类似的 . 
<%: Url.RouteUrl(new { controller = "Products", action = "List" }) %>

产生如下的URL:  /Products/List

在mvc应用程序中, 这些是不常用的, 但是熟悉他们还是有好处的.

 

§8.3.3  Performing Redirections to Generated URLs

实现一个重定向功能, 只要简单的返回RedirectToAction()结果, 并且传入目标controller和action方法.

public ActionResult MyActionMethod()
{
	return RedirectToAction("List", "Products");
}

如果你想获取一个URL字符串, 而不是实现HTTP重定向, 你可以做如下:

public ActionResult MyActionMethod()
{
	string url = Url.Action("SomeAction", new { customerId = 456 });
	// ... now do something with url
}

 

§8.3.4  Understanding the Outbound URL-Matching Algorithm

§8.3.5  Generating Hyperlinks with Html.ActionLink<T> and Lambda Expressions

§8.3.6  Working with Named Routes