问题
Let\'s say I have a class
public class ItemController:Controller
{
public ActionResult Login(int id)
{
return View(\"Hi\", id);
}
}
On a page that is not located at the Item folder, where ItemController resides, I want to create a link to the Login method. So which Html.ActionLink method I should use and what parameters should I pass?
Specifically, I am looking for the replacement of the method
Html.ActionLink(article.Title,
new { controller = \"Articles\", action = \"Details\",
id = article.ArticleID })
that has been retired in the recent ASP.NET MVC incarnation.
回答1:
I think what you want is this:
ASP.NET MVC1
Html.ActionLink(article.Title,
"Login", // <-- Controller Name.
"Item", // <-- ActionMethod
new { id = article.ArticleID }, // <-- Route arguments.
null // <-- htmlArguments .. which are none. You need this value
// otherwise you call the WRONG method ...
// (refer to comments, below).
)
This uses the following method ActionLink signature:
public static string ActionLink(this HtmlHelper htmlHelper,
string linkText,
string controllerName,
string actionName,
object values,
object htmlAttributes)
ASP.NET MVC2
two arguments have been switched around
Html.ActionLink(article.Title,
"Item", // <-- ActionMethod
"Login", // <-- Controller Name.
new { id = article.ArticleID }, // <-- Route arguments.
null // <-- htmlArguments .. which are none. You need this value
// otherwise you call the WRONG method ...
// (refer to comments, below).
)
This uses the following method ActionLink signature:
public static string ActionLink(this HtmlHelper htmlHelper,
string linkText,
string actionName,
string controllerName,
object values,
object htmlAttributes)
ASP.NET MVC3+
arguments are in the same order as MVC2, however the id value is no longer required:
Html.ActionLink(article.Title,
"Item", // <-- ActionMethod
"Login", // <-- Controller Name.
new { article.ArticleID }, // <-- Route arguments.
null // <-- htmlArguments .. which are none. You need this value
// otherwise you call the WRONG method ...
// (refer to comments, below).
)
This avoids hard-coding any routing logic into the link.
<a href="/Item/Login/5">Title</a>
This will give you the following html output, assuming:
article.Title = "Title"article.ArticleID = 5- you still have the following route defined
. .
routes.MapRoute(
"Default", // Route name
"{controller}/{action}/{id}", // URL with parameters
new { controller = "Home", action = "Index", id = "" } // Parameter defaults
);
回答2:
I wanted to add to Joseph Kingry's answer. He provided the solution but at first I couldn't get it to work either and got a result just like Adhip Gupta. And then I realized that the route has to exist in the first place and the parameters need to match the route exactly. So I had an id and then a text parameter for my route which also needed to be included too.
Html.ActionLink(article.Title, "Login", "Item", new { id = article.ArticleID, title = article.Title }, null)
回答3:
You might want to look at the RouteLink() method.That one lets you specify everything (except the link text and route name) via a dictionary.
回答4:
I think that Joseph flipped controller and action. First comes the action then the controller. This is somewhat strange, but the way the signature looks.
Just to clarify things, this is the version that works (adaption of Joseph's example):
Html.ActionLink(article.Title,
"Login", // <-- ActionMethod
"Item", // <-- Controller Name
new { id = article.ArticleID }, // <-- Route arguments.
null // <-- htmlArguments .. which are none
)
回答5:
what about this
<%=Html.ActionLink("Get Involved",
"Show",
"Home",
new
{
id = "GetInvolved"
},
new {
@class = "menuitem",
id = "menu_getinvolved"
}
)%>
回答6:
Html.ActionLink(article.Title, "Login/" + article.ArticleID, 'Item")
回答7:
If you want to go all fancy-pants, here's how you can extend it to be able to do this:
@(Html.ActionLink<ArticlesController>(x => x.Details(), article.Title, new { id = article.ArticleID }))
You will need to put this in the System.Web.Mvc namespace:
public static class MyProjectExtensions
{
public static MvcHtmlString ActionLink<TController>(this HtmlHelper htmlHelper, Expression<Action<TController>> expression, string linkText)
{
var urlHelper = new UrlHelper(htmlHelper.ViewContext.RequestContext, htmlHelper.RouteCollection);
var link = new TagBuilder("a");
string actionName = ExpressionHelper.GetExpressionText(expression);
string controllerName = typeof(TController).Name.Replace("Controller", "");
link.MergeAttribute("href", urlHelper.Action(actionName, controllerName));
link.SetInnerText(linkText);
return new MvcHtmlString(link.ToString());
}
public static MvcHtmlString ActionLink<TController, TAction>(this HtmlHelper htmlHelper, Expression<Action<TController, TAction>> expression, string linkText, object routeValues)
{
var urlHelper = new UrlHelper(htmlHelper.ViewContext.RequestContext, htmlHelper.RouteCollection);
var link = new TagBuilder("a");
string actionName = ExpressionHelper.GetExpressionText(expression);
string controllerName = typeof(TController).Name.Replace("Controller", "");
link.MergeAttribute("href", urlHelper.Action(actionName, controllerName, routeValues));
link.SetInnerText(linkText);
return new MvcHtmlString(link.ToString());
}
public static MvcHtmlString ActionLink<TController>(this HtmlHelper htmlHelper, Expression<Action<TController>> expression, string linkText, object routeValues, object htmlAttributes) where TController : Controller
{
var urlHelper = new UrlHelper(htmlHelper.ViewContext.RequestContext, htmlHelper.RouteCollection);
var attributes = AnonymousObjectToKeyValue(htmlAttributes);
var link = new TagBuilder("a");
string actionName = ExpressionHelper.GetExpressionText(expression);
string controllerName = typeof(TController).Name.Replace("Controller", "");
link.MergeAttribute("href", urlHelper.Action(actionName, controllerName, routeValues));
link.MergeAttributes(attributes, true);
link.SetInnerText(linkText);
return new MvcHtmlString(link.ToString());
}
private static Dictionary<string, object> AnonymousObjectToKeyValue(object anonymousObject)
{
var dictionary = new Dictionary<string, object>();
if (anonymousObject == null) return dictionary;
foreach (PropertyDescriptor propertyDescriptor in TypeDescriptor.GetProperties(anonymousObject))
{
dictionary.Add(propertyDescriptor.Name, propertyDescriptor.GetValue(anonymousObject));
}
return dictionary;
}
}
This includes two overrides for Route Values and HTML Attributes, also, all of your views would need to add: @using YourProject.Controllers or you can add it to your web.config <pages><namespaces>
回答8:
Use named parameters for readability and to avoid confusions.
@Html.ActionLink(
linkText: "Click Here",
actionName: "Action",
controllerName: "Home",
routeValues: new { Identity = 2577 },
htmlAttributes: null)
回答9:
With MVC5 i have done it like this and it is 100% working code....
@Html.ActionLink(department.Name, "Index", "Employee", new {
departmentId = department.DepartmentID }, null)
You guys can get an idea from this...
回答10:
This type use:
@Html.ActionLink("MainPage","Index","Home")
MainPage : Name of the text Index : Action View Home : HomeController
Base Use ActionLink
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>_Layout</title>
<link href="@Url.Content("~/Content/bootsrap.min.css")" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="container">
<div class="col-md-12">
<button class="btn btn-default" type="submit">@Html.ActionLink("AnaSayfa","Index","Home")</button>
<button class="btn btn-default" type="submit">@Html.ActionLink("Hakkımızda", "Hakkimizda", "Home")</button>
<button class="btn btn-default" type="submit">@Html.ActionLink("Iletişim", "Iletisim", "Home")</button>
</div>
@RenderBody()
<div class="col-md-12" style="height:200px;background-image:url(/img/footer.jpg)">
</div>
</div>
</body>
</html>来源：https://stackoverflow.com/questions/200476/html-actionlink-method