在MVC3的下拉列表中设置所选项目 [英] Set the selected item in dropdownlist in MVC3
问题描述
我必须在视图中为下拉列表设置所选项目.但它不起作用.
I have to set the selected item for a dropdownlist in view. But its not working.
//查看
<div class="editor-label">
@Html.LabelFor(model => model.Gender)
</div>
<div class="editor-field">
@Html.DropDownListFor(model => model.Gender,Model.GenderList)
</div>
//型号
[Required(ErrorMessage = "Please select gender!")]
[Display(Name = "Gender")]
public string Gender { get; set; }
public IEnumerable<SelectListItem> GenderList
{
get
{
return new[]
{
new SelectListItem { Value = "0", Text = "Select" },
new SelectListItem { Value = "1", Text = "Male" },
new SelectListItem { Value = "2", Text = "Female" },
};
}
}
性别属性具有需要在列表中选择的值.仍然无法正常工作.
The gender property has the value needs to be selected in the list. Still not working.
我错了吗?
推荐答案
首先，创建您的ViewModel.
First, create your ViewModel.
public class MovieViewModel
{
public string Genre { get; set; }
public IEnumerable<SelectListItem> GenreList
{
get
{
yield return new SelectListItem { Text = "Comedy", Value = "1" };
yield return new SelectListItem { Text = "Drama", Value = "2" };
yield return new SelectListItem { Text = "Documentary", Value = "3" };
}
}
}
然后，您的控制器创建此ViewModel的新实例，并将其发送到视图.
Then, your controller creates a new instance of this ViewModel and sends it to the view.
public class HomeController : Controller
{
//
// GET: /Home/
public ActionResult Index()
{
var viewModel = new MovieViewModel
{
Genre = "2"
};
return View(viewModel);
}
}
最后，该视图使用ASP.NET包装器[Html.DropDownListFor()] [1]显示下拉列表.
Finally, the view displays the dropdownlist using the ASP.NET wrapper [Html.DropDownListFor()][1].
@model MvcApplication1.Models.MovieViewModel
<!DOCTYPE html>
<html>
<head>
<title>My movie</title>
</head>
<body>
<div>
@Html.DropDownListFor(m => m.Genre, Model.GenreList)
</div>
</body>
</html>
然后根据ViewModel自动选择选定的值.无需手动设置对象 SelectListitem 的 Selected 属性.
The selected value is then automatically chosen according the ViewModel. There's no need to manually set the Selected property of the objects SelectListitem.
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