ASP.Net MVC RouteData和数组

Question

如果我有这样的动作:

public ActionResult DoStuff(List<string> stuff)
{
   ...
   ViewData["stuff"] = stuff;
   ...
   return View();
}

我可以使用以下URL点击它:

http://mymvcapp.com/controller/DoStuff?stuff=hello&stuff=world&stuff=foo&stuff=bar

但在我的ViewPage中,我有这个代码:

<%= Html.ActionLink("click here", "DoMoreStuff", "MoreStuffController", new { stuff = ViewData["stuff"] }, null) %>

不幸的是,MVC不够聪明,无法识别该动作采用数组,并展开列表以形成正确的URL路由.相反,它只是在对象上执行.ToString(),它只列出了List中的数据类型.

当目标Action的参数之一是数组或列表时,有没有办法让Html.ActionLink生成正确的URL？

- 编辑 -

正如Josh在下面指出的那样,ViewData ["stuff"]只是一个对象.我试图简化问题,但引起了一个无关的错误!我实际上使用的是专用的ViewPage <T>,因此我有一个紧密耦合的类型感知模型.ActionLink实际上看起来像:

<%= Html.ActionLink("click here", "DoMoreStuff", "MoreStuffController", new { stuff = ViewData.Model.Stuff }, null) %>

其中ViewData.Model.Stuff被键入为List

Answer 1

我认为自定义的HtmlHelper是有序的.

 public static string ActionLinkWithList( this HtmlHelper helper, string text, string action, string controller, object routeData, object htmlAttributes )
 {
     var urlHelper = new UrlHelper( helper.ViewContext.RequestContext );


     string href = urlHelper.Action( action, controller );

     if (routeData != null)
     {
         RouteValueDictionary rv = new RouteValueDictionary( routeData );
         List<string> urlParameters = new List<string>();
         foreach (var key in rv.Keys)
         {
             object value = rv[key];
             if (value is IEnumerable && !(value is string))
             {
                 int i = 0;
                 foreach (object val in (IEnumerable)value)
                 {
                     urlParameters.Add( string.Format( "{0}[{2}]={1}", key, val, i ));
                     ++i;
                 }
             }
             else if (value != null)
             {
                 urlParameters.Add( string.Format( "{0}={1}", key, value ) );
             }
         }
         string paramString = string.Join( "&", urlParameters.ToArray() ); // ToArray not needed in 4.0
         if (!string.IsNullOrEmpty( paramString ))
         {
            href += "?" + paramString;
         }
     }

     TagBuilder builder = new TagBuilder( "a" );
     builder.Attributes.Add("href",href);
     builder.MergeAttributes( new RouteValueDictionary( htmlAttributes ) );
     builder.SetInnerText( text );
     return builder.ToString( TagRenderMode.Normal );
}