将视图中的下拉列表绑定到表中的列.净MVC4

本文关键字：MVC4 绑定 视图 下拉列表 | 更新日期: 2023-09-27 18:06:26

我是ASP的新手。NET MVC，我将感谢任何帮助我的问题。关于这个话题，我已经做了大量的研究(显然不够)。我需要将下拉列表绑定到表中的特定列，然后在视图中呈现它。我已经有了在控制器中检索表的查询:

  public ActionResult SelectAccountEmail()
        {
            var queryAccountEmail = (from AccountEmail in db.UserBases select AccountEmail) 
            var selectItems = new SelectList(queryAccountEmail);
            return View(selectItems); 
        }
当将查询绑定到视图中的下拉列表时，我迷路了。
@model RecordUploaderMVC4.Models.UserBase
@{
    ViewBag.Title = "SelectAccountEmail";
}
<h2>SelectAccountEmail</h2>
@Html.LabelFor(model => model.AccountEmail); 
@Html.DropDownList(Model.AccountEmail);  
@Html.ValidationMessageFor(model => model.AccountEmail); 
<input /type="submit" value="Submit">

当我运行它时，我得到这个错误:

Server Error in '/' Application.
--------------------------------------------------------------------------------

The model item passed into the dictionary is of type 'System.Web.Mvc.SelectList', but this dictionary requires a model item of type 'RecordUploaderMVC4.Models.UserBase'.

任何帮助将不胜感激。

提前感谢。

将视图中的下拉列表绑定到表中的列.净MVC4

几处不对。首先，更改您的模型以添加以下属性(查看您的视图，它是RecordUploaderMVC4.Models.UserBase):

public class UserBase
{
    public string AccountEmail { get; set; }
    public SelectList Emails { get; set; }
    //rest of your model
}

然后，在控制器中正确地构建模型:

 public ActionResult SelectAccountEmail()
 {
     UserBase model = new UserBase();
     var queryAccountEmail = (from AccountEmail in db.UserBases select AccountEmail) 
     model.Emails = new SelectList(queryAccountEmail);
     return View(model); 
 }

在你的视图中，你可以这样做:

@Html.LabelFor(model => model.AccountEmail)
@Html.DropDownListFor(model => model.AccountEmail, Model.Emails)
@Html.ValidationMessageFor(model => model.AccountEmail)

第一步:首先像这样创建一个模型来保存listfaccountemail 

public class AccountEmailViewModel
    {
        public int AccountEmailId { get; set; }
        public string AccountEmailDescription { get; set; }
    }

步骤2:创建模型类

 public class UserBaseViewModel
    {    

                public IEnumerable<SelectListItem>  AccountEmail { get; set; }
                public string AccountEmail { get; set; }
    }

步骤3:

在控制器

            [HttppGet]
            public ActionResult SelectAccountEmail()
            {
                var EmailAccounts = (from AccountEmail in db.UserBases select AccountEmail)
               UserBase userbaseViewModel = new UserBase
                {
                    AccountEmail = EmailAccounts.Select(x => new SelectListItem
                  {
                      Text = x.AccountEmailDescription,
                      Value = Convert.ToString(x.AccountEmailId)
                  }).ToList()
                };
                return View(userbaseViewModel);
            }

步骤4:In View

 @model RecordUploaderMVC4.Models.UserBase
    @{
       ViewBag.Title = "SelectAccountEmail";
    }
    <h2>SelectAccountEmail</h2>
    @Html.ValidationSummary()
    <h2>SelectAccountEmail</h2>
                            @Html.LabelFor(model => model.AccountEmail )
                                @Html.DropDownListFor(x => x.AccountEmailId, Model.AccountEmail, "Please Select", "")
                            </div>
    <input /type="submit" value="Submit">
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