MVC 中@Html.DropDownListFor() 设置选中项这么不好使？ [问题点数：40分，结帖人lkf181]...

阅读：评论：0

由于不知道错误原因在哪我尽量把代码都贴出来吧：
重点是：在 Controller 类里我给 SelectListItem集合的某项 Selected 赋值为TRUE 在视图中就应该将该项选中吧？？在我这怎么没还是呢？没有任何项选中！！
Controller 类：

C# code ?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 using S01MVC.Models; using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; namespace S01MVC.Controllers { public class LkfValidateController : Controller { // // GET: /LkfValidate/ public ActionResult Index() { LkfValidateData model = new LkfValidateData() { InCome = 1000000, LastLoginTime = DateTime.Now.AddDays(-5), UserPassword = "12345678" , UserName = "郭德纲" , UserID = 1 }; List<SelectListItem> list = new List<SelectListItem>(); list.Add( new SelectListItem() { Text = "500元以下" , Value = "500" }); list.Add( new SelectListItem() { Text = "1000元以下" , Value = "1000" }); list.Add( new SelectListItem() { Text = "一万元以下" , Value = "10000" }); list.Add( new SelectListItem() { Text = "十万元以下" , Value = "100000" }); list.Add( new SelectListItem() { Text = "一百万元以下" , Value = "1000000" , Selected = true }); ViewData[ "income" ] = list.AsEnumerable(); return View(model); } } }

Views 视图：

C# code ?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 @model S01MVC.Models.LkfValidateData @{ Layout = null ; } <!DOCTYPE html> <html> <head> <meta name= "viewport" content= "width=device-width" /> <title>Index</title> <style type= "text/css" > #tbinfo{border:1px solid #0094ff; margin:auto} #tbinfo td{ border: 1px solid #0094ff; } </style> </head> <body> <div> @ using (Html.BeginForm( "edit" , "LkfValidateData" ,FormMethod.Post)) { IHtmlString stralogn = Html.Raw( "align="right"" ); <table id= "tbinfo" > <tr><td align= "right" >@Html.LabelFor(c=>c.UserID)</td><td>@Model.UserID</td></tr> <tr><td @stralogn>@Html.LabelFor(c => c.UserName)</td><td>@Html.TextBoxFor(c => c.UserName) </td></tr> <tr><td @stralogn>@Html.LabelFor(c => c.UserPassword)</td><td>@Html.EditorFor(c=>c.UserPassword)</td></tr> <tr><td @stralogn>@Html.LabelFor(c => c.LastLoginTime)</td><td>@Html.DisplayTextFor(c=>c.LastLoginTime)</td></tr> <tr><td @stralogn>@Html.LabelFor(c => c.InCome)</td><td>@Html.DropDownListFor(c=>c.InCome,ViewData[ "income" ] as IEnumerable<SelectListItem>)</td></tr> </table> } </div> </body> </html>

模型类：LkfValidateData

C# code ?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 namespace S01MVC.Models { public class LkfValidateData { [DisplayNameAttribute( "用户ID" )] public long UserID { get ; set ; } [DisplayName( "用户名" )] public string UserName { get ; set ; } [DisplayName( "用户密码" )] [DataTypeAttribute(DataType.Password)] public string UserPassword { get ; set ; } [DisplayName( "最后登录时间" )] public DateTime? LastLoginTime { get ; set ; } [DisplayName( "收入" )] public decimal InCome { get ; set ; } } }