[英]Asp.Net MVC with Drop Down List, and SelectListItem Assistance
我正在尝试构建一个Dropdownlist,但与Html.DropDownList渲染作斗争。
我有一节课:
public class AccountTransactionView
{
public IEnumerable<SelectListItem> Accounts { get; set; }
public int SelectedAccountId { get; set; }
}
这基本上是我现在的视图模型。 帐户列表以及用于返回所选项目的属性。
在我的控制器中,我像这样准备好数据:
public ActionResult AccountTransaction(AccountTransactionView model)
{
List<AccountDto> accounts = Services.AccountServices.GetAccounts(false);
AccountTransactionView v = new AccountTransactionView
{
Accounts = (from a in accounts
select new SelectListItem
{
Text = a.Description,
Value = a.AccountId.ToString(),
Selected = false
}),
};
return View(model);
}
现在的问题是:
我正在尝试在我的视图中构建Drop:
<%=Html.DropDownList("SelectedAccountId", Model.Accounts) %>
我收到以下错误:
具有键“SelectedAccountId”的ViewData项的类型为“System.Int32”,但必须是“IEnumerable”类型。
为什么要我退回整个项目清单? 我只想要选中的值。 我该怎么做?
您有一个视图模型,您的视图强类型=>使用强类型帮助程序:
<%= Html.DropDownListFor(
x => x.SelectedAccountId,
new SelectList(Model.Accounts, "Value", "Text")
) %>
还要注意我使用SelectList
作为第二个参数。
在您的控制器操作中,您返回作为参数传递的视图模型,而不是您在正确设置Accounts属性的操作中构建的视图模型,因此这可能会有问题。 我已经清理了一下:
public ActionResult AccountTransaction()
{
var accounts = Services.AccountServices.GetAccounts(false);
var viewModel = new AccountTransactionView
{
Accounts = accounts.Select(a => new SelectListItem
{
Text = a.Description,
Value = a.AccountId.ToString()
})
};
return View(viewModel);
}
第1步:你的Model类
public class RechargeMobileViewModel
{
public string CustomerFullName { get; set; }
public string TelecomSubscriber { get; set; }
public int TotalAmount { get; set; }
public string MobileNumber { get; set; }
public int Month { get; set; }
public List<SelectListItem> getAllDaysList { get; set; }
// Define the list which you have to show in Drop down List
public List<SelectListItem> getAllWeekDaysList()
{
List<SelectListItem> myList = new List<SelectListItem>();
var data = new[]{
new SelectListItem{ Value="1",Text="Monday"},
new SelectListItem{ Value="2",Text="Tuesday"},
new SelectListItem{ Value="3",Text="Wednesday"},
new SelectListItem{ Value="4",Text="Thrusday"},
new SelectListItem{ Value="5",Text="Friday"},
new SelectListItem{ Value="6",Text="Saturday"},
new SelectListItem{ Value="7",Text="Sunday"},
};
myList = data.ToList();
return myList;
}
}
步骤2:调用此方法填充控制器Action中的Drop down
namespace MvcVariousApplication.Controllers
{
public class HomeController : Controller
{
public ActionResult Index()
{
RechargeMobileViewModel objModel = new RechargeMobileViewModel();
objModel.getAllDaysList = objModel.getAllWeekDaysList();
return View(objModel);
}
}
}
步骤3:按如下方式填写下拉列表
@model MvcVariousApplication.Models.RechargeMobileViewModel
@{
ViewBag.Title = "Contact";
}
@Html.LabelFor(model=> model.CustomerFullName)
@Html.TextBoxFor(model => model.CustomerFullName)
@Html.LabelFor(model => model.MobileNumber)
@Html.TextBoxFor(model => model.MobileNumber)
@Html.LabelFor(model => model.TelecomSubscriber)
@Html.TextBoxFor(model => model.TelecomSubscriber)
@Html.LabelFor(model => model.TotalAmount)
@Html.TextBoxFor(model => model.TotalAmount)
@Html.LabelFor(model => model.Month)
@Html.DropDownListFor(model => model.Month, new SelectList(Model.getAllDaysList, "Value", "Text"), "-Select Day-")
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.