我必须为视图中的下拉列表设置选定的项目.但是它不起作用.
//视图
<div class="editor-label">
@Html.LabelFor(model => model.Gender)
</div>
<div class="editor-field">
@Html.DropDownListFor(model => model.Gender,Model.GenderList)
</div>
//模型
[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.还是行不通.
我哪里错了？
解决方法:
首先,创建您的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.
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.
@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.