在MVC4中获取dropdownlist的值

Question

我是MVC的新手，请告诉我如何在控制器中检索选定的dropdownlist值，这是将值添加到dropdownlist的方法

List<SelectListItem> items = new List<SelectListItem>();
            items.Add(new SelectListItem { Text = "What is your Place of Birth?", Value = "What is your Place of Birth?" });
            items.Add(new SelectListItem { Text = "What is your favourite Book?", Value = "What is your favourite Book?" });
            items.Add(new SelectListItem { Text = "What is your childhood friend name?", Value = "What is your childhood friend name?" });
            items.Add(new SelectListItem { Text = "What is your first car make and model?", Value = "What is your first car make and model?" });
            items.Add(new SelectListItem { Text = "What is your favourite place?", Value = "What is your favourite place?" });
            ViewData["ddlitems"] = items;

查看文件

@Html.DropDownList("ddlitems")

Answer 1

在模型上，为该值提供一个属性：

class ModelClass
{
    public string DropdownValue{get; set;}
}

然后使用以下Razor语法

@Html.DropdownListFor(m => m.DropdownValue, "ddItems");

这将创建一个与Model属性相同名称的下拉列表，它应自动与模型一起回发

Answer 2

获取所选选项的值的最简单方法是使元素的ID与要发布到ActionResult的元素的ID匹配。 因此，如果您的select元素呈现为；

<select id="SomeID">
    <option value="What is your Place of Birth?">What is your Place of Birth?</option>
</select>

然后将其发布到ActionResult

[HttpPost]
public ActionResult MyActionResult(string SomeID){
    // SomeID = What is your Place of Birth?
    Return View();
}

在您的情况下，这可能是最简单的选择，因为您没有要传递给View的强类型对象。 另请注意，这将与您发布的任何表单元素一起使用。 只需将ID与ActionResult上的参数进行匹配即可。

更进一步，您可能最好阅读ASP.Net MVC中的模型绑定。