@ Html.DropDownListFor如何添加选项？

Question

@Html.DropDownListFor(model => model.ZipFile, new SelectList(ViewBag.ZipFiles))

上面的代码创建了一个选择列表就好了.但我想让选择可选.不幸的是没有空选项,我想加一个.我怎么做？

Answer 1

通过使用正确的DropDownListFor重载:

@Html.DropDownListFor(
    model => model.ZipFile, 
    new SelectList(ViewBag.ZipFiles),
    "-- please select a zip file --"
)

Answer 2

@Html.DropDownListFor(model => model.Country, new List<SelectListItem>
   {
     new SelectListItem { Text = "India", Value = "1"},
     new SelectListItem { Text = "USA", Value = "2"},
     new SelectListItem { Text = "Sreelanka", Value = "3"},
     new SelectListItem {Text  = "Africa",Value="4"},
     new SelectListItem { Text = "China", Value = "5" },
     new SelectListItem { Text = "Austraila", Value = "6" },
     new SelectListItem { Text = "UK", Value = "7" }
  }, "Select Country", 
  new {@Style = "Width:500px;height:40px;",
  @class = "form-control input-lg"})