网址操作未将参数传递给索引

Question

In my controller I have the following code:

    public ActionResult Index(int? videoId, int languageId = 0)
        {

               //Some code 
        }

Then in my .chtml page I reference it like so:

@using (Html.BeginForm("Index", "VideoLanguage", FormMethod.Post))
{
     @Html.Hidden("videoId", Model.VideoId)
     @Html.Hidden("videoLanguageId", Model.SelectedLanguage.LanguageId)

    <div>
        @Html.DropDownListFor(model => model.SelectedLanguage.LanguageId, ViewData["LanguageId"] as SelectList)
    </div>
    <div>
          <a href="@Url.Action("Index", "VideoLanguage",new { videoId = Model.VideoId, languageId = Model.SelectedLanguage.LanguageId })" class="linkbutton">Add Language</a>
    </div>

... code keeps going

So what happens when i click the button, the selected value for LanguageId from the drop down isnt passed. The original value is.

Answer 1

<a href="@Url.Action("Index", "VideoLanguage",new { videoId = Model.VideoId, languageId = Model.SelectedLanguage.LanguageId })" class="linkbutton">Add Language</a>

Is set when the page loads, so the values in the HTML will be hardcoded in. What you need to do is either set the hyperlink parameters in Javascript OR use:

<input type="submit" value="Index" />

See How to pass a textbox value from view to a controller in MVC 4?

Answer 2

try this:

@using (Html.BeginForm("Index", "VideoLanguage", FormMethod.Post, new { videoId = Model.VideoId, languageId = Model.SelectedLanguage.LanguageId }))
{
  ....
}

Answer 3

You should pass your params to the @Html.BeginForm helper and just submit the form

@using (Html.BeginForm("Index", "VideoLanguage", FormMethod.Post, new { videoId = Model.VideoId, languageId = Model.SelectedLanguage.LanguageId }))
{
     @Html.Hidden("videoId", Model.VideoId)
     @Html.Hidden("videoLanguageId", Model.SelectedLanguage.LanguageId)

    <div>
        @Html.DropDownListFor(model => model.SelectedLanguage.LanguageId, ViewData["LanguageId"] as SelectList)
    </div>
    <div>
       <input type="submit" value="Add Language"/>
    </div>

... code keeps going
}

in your Controller you also should have two methods GET and SET with the same name:

public ActionResult Index()
        {
//Here just get a view
        }

[HttpPost]
public ActionResult Index(int? videoId, int languageId = 0)
        {
 //Here code to save in database
        }