[英]ASP.Net Core MVC - Complex ViewModel not binding property with list of objects
I have a ViewModel with some properties and a list of objects.我有一个带有一些属性和对象列表的 ViewModel。 I also have a controller to create the data from the ViewModel.
我还有一个 controller 从 ViewModel 创建数据。
Whenever the request gets back to the controller, I restrict the binding on Nickname
and Items
.每当请求返回到 controller 时,我都会限制对
Nickname
和Items
的绑定。 The ModelState
is invalid as the binding on the list is null
. ModelState
无效,因为列表上的绑定是null
。
ViewModel视图模型
public class ContainerViewModel
{
public Guid ID { get; set; }
public string Nickname { get; set; }
public List<ItemViewModel> Items { get; set; }
public Guid NewItemID { get; set; }
public string NewItemNickname { get; set; }
public uint NewItemQuantity { get; set; }
public void AddNewItem()
{
Items.Add(new ItemViewModel {
ID = NewItemID,
Nickname = NewItemNickname,
Quantity = NewItemQuantity
});
NewItemID = Guid.NewGuid();
NewItemNickname = default;
NewItemQuantity = default;
}
public class ItemViewModel
{
public Guid ID { get; set; }
public string Nickname { get; set; }
public uint Quantity { get; set; }
}
}
Controller Controller
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create([Bind("Nickname,Items")] ContainerViewModel containerVM, CancellationToken token)
{
if (ModelState.IsValid) {
await _manager.Add(PrepareDataModel(containerVM), token);
return RedirectToAction(nameof(Index));
}
return View(containerVM);
}
--EDIT-- - 编辑 -
Create.cshtml创建.cshtml
@model MyProject.Models.ContainerViewModel
@{
ViewData["Title"] = "Create";
}
<h1>Create</h1>
<h4>Container</h4>
<hr />
<div class="row">
<div class="col-md-4">
<form asp-action="Create">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<div class="form-group">
<label asp-for="Nickname" class="control-label"></label>
<input asp-for="Nickname" class="form-control" />
<span asp-validation-for="Nickname" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Quantity" class="control-label"></label>
<input asp-for="Quantity" type="number" class="form-control" />
<span asp-validation-for="Quantity" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Items" class="control-label"></label>
@await Html.PartialAsync("Items/_Create")
<span asp-validation-for="Items" class="text-danger"></span>
</div>
<div class="form-group">
<input type="submit" value="Create" class="btn btn-primary" />
</div>
</form>
</div>
</div>
<div>
<a asp-action="Index">Back to List</a>
</div>
@section Scripts {
@{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}
Items/_Create.cshtml项目/_Create.cshtml
@model MyProject.Models.ContainerViewModel
<table class="table">
<thead>
<tr>
<th>
@Html.DisplayNameFor(model => model.NewItemNickname)
</th>
<th>
@Html.DisplayNameFor(model => model.NewItemQuantity)
</th>
<th></th>
</tr>
</thead>
<tbody>
@foreach (var item in Model.Items) {
<tr>
<td>
@Html.DisplayFor(modelItem => item.Nickname)
</td>
<td>
@Html.DisplayFor(modelItem => item.Quantity)
</td>
<td></td>
</tr>
}
<tr>
<td>
<input asp-for="NewItemNickname" class="form-control" />
<span asp-validation-for="NewItemNickname" class="text-danger"></span>
</td>
<td>
<input asp-for="NewItemQuantity" type="number" class="form-control" />
<span asp-validation-for="NewItemQuantity" class="text-danger"></span>
</td>
<td>
<input type="submit" asp-action="CreateNewItem" value="Add" class="btn btn-secondary" />
</td>
</tr>
</tbody>
</table>
In your Partial View, you just use @Html.DisplayFor(xxxxx)
to show the data of Items
,So these data will not be submit.在你的 Partial View 中,你只是使用
@Html.DisplayFor(xxxxx)
来显示Items
的数据,所以这些数据不会被提交。 Change your code like this:像这样更改您的代码:
Items/_Create.cshtml项目/_Create.cshtml
//.......
@for (var i = 0; i < @Model.Items.Count; i++)
{
<tr>
<td>
@Html.DisplayFor(modelItem => @Model.Items[i].Nickname)
// use hidden to submit the data
<input type="hidden" asp-for="@Model.Items[i].Nickname">
</td>
<td>
@Html.DisplayFor(modelItem => @Model.Items[i].Quantity)
<input type="hidden" asp-for="@Model.Items[i].Quantity">
</td>
<td></td>
</tr>
}
//.......
Result结果
Because you don't provide the code of CreateNewItem
, I think it is may be use d to add new data in Items
, I don't write this action, So ss
.因为你没有提供
CreateNewItem
的代码,我觉得可能是用来往Items
添加新数据的,这个动作我就不写了,所以ss
。 3
will not be submited to controller. 3
不会提交到controller。
You can see controller can receive Items
successfully.可以看到controller可以成功收到
Items
。
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