ASP.NET MVC Html.ActionLink with a List<string> parameter

Question

How can I pass a list of parameters to a ActionLink all of which have the same name? I am using the default route.

I am looking for something like the following, but I know that anonymous objects can't have keys with the same name. Also, RoutingValueDictionary cannot have keys with the same name.

 @Html.ActionLink("Link Name", "Index", "Home", new {key="val1", key="val2", ... }, null)

Which would link to

localhost:8080/Home/Index?key=val1&key=val2& ...

How can I create this link?

For starters, you are using the wrong overload .ActionLink(linkText, actionName, controllerName, htmlAttributes). — Jasen
– Jasen, Commented Feb 1, 2016 at 18:39
Besides the compiler error here, using the same key name will cause other problems. What are you trying to solve with the identical key names? — Jasen
– Jasen, Commented Feb 1, 2016 at 18:48
Try to see this stackoverflow.com/questions/1752721/… maybe can be useful to you. — Joel R Michaliszen
– Joel R Michaliszen, Commented Feb 1, 2016 at 18:48
Basically, I want to redirect to a page that will show data for multiple items, all of which have a key. Like selecting a subset of items from an index page. — mcnnowak
– mcnnowak, Commented Feb 1, 2016 at 18:49

user3559349 · Accepted Answer · 2016-02-01 22:51:11Z

1

You will need to create the <a> tag manually

<a href="@Url.Action("Index", "Home")?key=val1&key=val2&key=val3">Link Name</a>

however from your comments your appear to be wanting to pass the values of checkboxes, in which case you can use a form with FormMethod.Get

@using (Html.BeginForm("Index", "Home", FormMethod.Get)
{
  <input type="checkbox" name="key" value="val1" />
  <input type="checkbox" name="key" value="val2" />
  <input type="checkbox" name="key" value="val3" />
  <input type="submit" value="Save" />
}

which will generate

.../Home/Index?key=val1&key=val3

assuming you check the 1st and 3rd checkboxes

answered Feb 1, 2016 at 22:51

user3559349

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3 Comments

mcnnowak Over a year ago

Thanks! I'm going to use a modified version of your answer. Didn't know you could have different controls in a form with the same name.

user3559349 Over a year ago

You can do that if you binding to a collection of simple value types (e.g. your method is public ActionResult Index(string[] key) but it would not work if your binding to a collection of complex objects (in which case you would need indexers)

mcnnowak Over a year ago

Yes, I'm using string[] key in my controller, this should work just fine. I had everything working on my page with manually created URLs when I asked this question, just needed a way to produce the URL.

Steve Harris · Accepted Answer · 2016-02-01 22:42:48Z

0

You can't pass key, key, key, key and key. Because key = key! Instead pass a list.

Create a model

public class MyModel
{
    public List<string> Keys { get; set;}
}

Accept it in your controller

public ActionResult LinkName(MyModel model)
{
    // stuff
}

And pass from your view

@using (Html.Beginform("LinkName"))
{
    <input name="Keys[0]">
    <input name="Keys[1]">
    <input type="submit" value="submit">
}

answered Feb 1, 2016 at 22:42

Steve Harris

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