ModelBinder with multiple selection and complex objects

I'm trying to bind the selections in a multiple selection SELECT, to an IList input in the controller.

<select name="users" multiple="multiple">
  <option>John</option>
  <option>Mary</option>
</select>

class 开发者_运维问答User
{
    public string Name { get; set; }
}

//Action
void Update(IList<User> users)
{
}

I've tried renaming the select as "users", "users.Name" or "users.User.Name" without success.

Hi there are two ways you can do this. The first is using the FormCollection, this returns the results as a CSV list. So the code would be something like:

[HttpPost]
public ActionResult Update(FormCollection collection)
{
    collection[0] 
    // providing this is your first item in your collection you 
    // may need to debug this to find out
}

The second option is using a parameter which will look something like:

[HttpPost]
public ActionResult Update(string[] users)
{
}

If you set values in your select box like:

<select name="users" multiple="multiple">
    <option value="1">John</option>
    <option value="2">Mary</option>
</select>

Then it will be the values in the array and not the names, in which case your action could look like:

[HttpPost]
public ActionResult Update(int[] users)
{
}

Try to use a ViewModel class like this:

public class TestViewModel
    {
        public List<string> Users { get; set; }
    }

And then in your Action you set that ViewModel class as an input parameter like this:

public ActionResult Save(TestViewModel model)
        {
            return View("Index");
        }

It have worked for me.