在MVC Web应用程序中，它是具有强类型模型的视图，其中正在按模型生成下拉列表/将其绑定。
下面是查看代码：
@model LoanViewModel
<form class="wrapper minheight homeloan-form border-top" id="homeloan-form" method="post" action="LeadContact" novalidate="novalidate">
<p>@Html.ValidationSummary()</p>
<p>Select an Item : @Html.DropDownListFor(x => x.HomeLoanLead.Items, new SelectList(Model.HomeLoanLead.Items), "--Choose any Item--")</p>
<div class="formnav row">
<button class="">Show Top Home Loans <i class="fa fa-chevron-right"></i></button>
</div>
</form>
在模型中，我为下拉列表提供了硬编码选项：
public List<string> Items
{
get { _items = new List<string>();
_items.Add("One");
_items.Add("Two");
_items.Add("Three");
return _items;
}
}
在发回邮件时，我无法获得下拉菜单中的选定值。请指导我如何进行选择下拉值的后期处理。
一个Html.DropDownFor()用于显示选项列表并绑定到属性的简单示例：
模型
public class LoanViewModel
{
[Required]
[Display(Name="Select Item")]
public string Item { get; set; }
public SelectList ItemList { get; set; }
}
控制器
public ActionResult Edit()
{
LoanViewModel model = new LoanViewModel();
model.Item = "Two"; // this will now pre-select the second option in the view
ConfigureEditModel(model);
return View(model);
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(LoanViewModel model)
{
if (!ModelState.IsValid)
{
ConfigureEditModel(model); // repopulate select list
return View(model); // return the view to correct errors
}
// If you want to validate the the value is indeed one of the items
ConfigureEditModel(model);
if (!model.ItemList.Contains(model.Item))
{
ModelState.AddModelError(string.Empty, "I'm secure!");
return View(model);
}
string selectedItem = model.Item;
....
// save and redirect
}
private void ConfigureEditModel(LoanViewModel model)
{
List<string> items = new List<string>() { "One", "Two", "Three" };
model.ItemList = new SelectList(items); // create the options
// any other common stuff
}
看法
@model LoanViewModel
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
@Html.DisplayFor(m => m.Item)
@Html.DropDownListFor(m => m.Item, Model.ItemList), "--Choose any Item--")
@Html.ValidationMessageFor(m => m.Item)
<input type="submit" value="Submit" />
}
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