Question

I’m trying to pass the selected value of a DropDownList to a new controller method. However, in the controller, leagueKey is always coming back null. The drop down list is populating with values.

If I change new { leagueKey = Model.SelectedLeagueKey} to new {leagueKey = "test"} the controller correct receives the “test” value. It appears that the DropDownList isn’t binding the selected value to Model.SelectedLeagueKey.

Model

public Dictionary<string, string> Leagues { get; set; }
public string SelectedLeagueKey { get; set; }

View

<div class="edit-field">
    @Html.DropDownListFor(model => model.SelectedLeagueKey, new SelectList(Model.Leagues, "Key", "Value", Model.SelectedLeagueKey),"Select League")
</div>
    @Html.ActionLink("Select League", "AddTeam", "Team", new { leagueKey =  Model.SelectedLeagueKey}, null)

Controller

public ActionResult AddTeam(LTEDContext context, string leagueKey)
    {
        //Do something with leagueKey here
        return View();
    }

Answer 1

Your view send you the SelectedLeagueKey parameter according to

<div class="edit-field">
   @Html.DropDownListFor(model => model.SelectedLeagueKey, new SelectList(Model.Leagues, "Key", "Value", Model.SelectedLeagueKey),"Select League")
</div>

Try to use the next code in a view:

@using (Html.BeginForm("AddTeam", "Team")) {    
<div class="edit-field">
   @Html.DropDownListFor(model => model.SelectedLeagueKey, new SelectList(Model.Leagues, "Key", "Value", Model.SelectedLeagueKey),"Select League")
</div>
<submit type="submit"/>

}

and the next one in controller:

public ActionResult AddTeam(LTEDContext context, string SelectedLeagueKey)
{
    //Do something with leagueKey here
    return View();
}