这取决于你正在传递的FormCollection然后只需你可以通过这个访问它的价值，你如何让你的表单值

It depends how you are getting values of your form if you are passing formcollection then simply you can access its value by this

public ActionResult MyAction (FormCollection form)
    {
        string value = form["DropDownListName"];
    }

或者你也可以通过

Or you can access it through

string value = Request.Form["DropDownListName"];