我正在做一个MVC APP，我有一个具有实体的模型视图和一个IList，它在Controller中填充以填充DropdownList。
这是我的ViewModel
public class UserViewModel
{
public Users user { get; set; }
public IList<SelectListItem> AvailableCountries { get; set; }
}
User is a class
控制器看起来像这样。
public ActionResult Create()
{
var countries = GetCountries();
var model = new UserViewModel { AvailableCountries = countries };
return View(model);
}
GetCountries是一个返回国家/地区列表的函数。
视图是从
导入的普通视图@model TableAvivaVoz.Models.UserViewModel
View的其余部分，我认为不重要......每个元素都继承自model.user.
我发现的问题是在提交视图时。在Create Method上，看起来像这样。
public async Task<ActionResult> Create([Bind(Include = "Country_id,Name,LastName,Sex,CodArea,PhoneNumber,Email,Password,ConfirmPassword")] Users user)
如果我的Create方法返回UserViewModel实例，则所有属性都为空。
它获取了User类的所有属性，它是我UserViewModel类的一部分。
但是，如果错误发生，我不知道如何调用返回AvailableCountries实例的UserViewModel方法......
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Create([Bind(Include = "Country_id,Name,LastName,Sex,CodArea,PhoneNumber,Email,Password,ConfirmPassword")] Users user)
{
try
{
if (ModelState.IsValid)
{
_db.Users.Add(user);
_db.SaveChanges();
return RedirectToAction("Create");
}
UserViewModel.AvailableCountries = GetCountries();//error
return View(user);
}
我的问题是，当我有实例或用户而不是UserViewModel时，如何调用AvailableCountries方法？
感谢
这是我的观点...
@model TableAvivaVoz.Models.UserViewModel
@{
ViewBag.Title = "Create";
}
<h2>Create</h2>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Users</h4>
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
<div class="form-group">
@Html.LabelFor(model => model.user.Country_id, "Country", htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownListFor(m => m.user.Country_id, Model.AvailableCountries, new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.user.Country_id, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.user.Name, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.user.Name, new { htmlAttributes = new { @class = "form-control", placeholder = "Nombre" } })
@Html.ValidationMessageFor(model => model.user.Name, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.user.LastName, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.user.LastName, new { htmlAttributes = new { @class = "form-control", placeholder = "Apellido" } })
@Html.ValidationMessageFor(model => model.user.LastName, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.user.Sex, "Género", htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.Label("Hombre")
@Html.RadioButtonFor(model => model.user.Sex, "1", new { htmlAttributes = new { @class = "form-control" } })
@Html.Label("Mujer")
@Html.RadioButtonFor(model => model.user.Sex, "0", new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.user.Sex, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.user.CodArea, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.user.CodArea, new { htmlAttributes = new { @class = "form-control", placeholder = "Cód Area" } })
@Html.ValidationMessageFor(model => model.user.CodArea, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.user.PhoneNumber, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.user.PhoneNumber, new { htmlAttributes = new { @class = "form-control", placeholder = "Número Telefono" } })
@Html.ValidationMessageFor(model => model.user.PhoneNumber, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.user.Email, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.user.Email, new { htmlAttributes = new { @class = "form-control", placeholder = "Email" } })
@Html.ValidationMessageFor(model => model.user.Email, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.user.Password, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.PasswordFor(model => model.user.Password, new { @class = "form-control", placeholder = "Contraseña" })
@Html.ValidationMessageFor(model => model.user.Password, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.user.ConfirmPassword, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.PasswordFor(model => model.user.ConfirmPassword, new { @class = "form-control", placeholder = "Repetir Contraseña" })
@Html.ValidationMessageFor(model => model.user.ConfirmPassword, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
<div style="position:relative;">
<label>Image</label>
<div>Upload new image: <input type="file" name="Image" /></div>
</div>
@if (Model.user == null || Model.user.Picture == null)
{
<div class="form-control-static">No Image</div>
}
@*else
{
<img class="img-thumbnail" width="150" height="150" src="@Url.Action("GetImage", "Product",new { Model.ProductID })" />
}*@
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
}
<div>
@Html.ActionLink("Back to List", "Index")
</div>
@section Scripts {
@Scripts.Render("~/bundles/jqueryval")
}
答案 0 :(得分：1)
您可以从“创建”操作返回相同的UserViewModel：
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Create([Bind(Include = "Country_id,Name,LastName,Sex,CodArea,PhoneNumber,Email,Password,ConfirmPassword")] Users user)
{
try
{
if (ModelState.IsValid)
{
_db.Users.Add(user);
_db.SaveChanges();
return RedirectToAction("Create");
}
var model = new UserViewModel
{
user = user,
AvailableCountries = GetCountries(),
};
return View(model);
}
}
答案 1 :(得分：1)
我认为你应该改变它，所以你把它留给mvc的自动绑定，这是更清洁
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Create(UserViewModel model)
{
if (ModelState.IsValid)
{
var user = new User();
user.FirstName = model.User.FirstName;
//........ rest of the properties here
_db.Users.Add(user);
_db.SaveChanges();
return RedirectToAction("Create");
}
model.AvailableCountries = GetCountries();//error
return View(model);
}