我有一个模型ApplicantBranchList,它在较大的模型中用作属性,如下所示：
[Display(Name = "Where would you want to work?")]
public ApplicantBranchList PreferedBranches { get; set; }
ApplicantBranchList：
public class ApplicantBranchList : viewmodel { public ApplicantBranchItem HeaderItem { get; set; } public ApplicantBranchList() { HeaderItem = new ApplicantBranchItem(); } public void MapFromEntityList(IEnumerable<ApplicantBranch> applicantBranches) { var service = new BranchService(DbContext); var selectedIds = applicantBranches.Select(b => b.BranchId); Items = service.ReadBranches() .Where(i => !i.IsDeleted) .Select(p => new ApplicantBranchItem { BranchName = p.Name,WillWorkAt = selectedIds.Contains(p.Id) }); } public IEnumerable<ApplicantBranchItem> Items { get; set; } }
ApplicantBranchList有自己的编辑器模板,以及ApplicantBranchList中每个项目的内部编辑器模板：
查看/共享/ EditorTemplates / ApplicantBranchList.cshtml：
@model Comair.RI.UI.Models.ApplicantBranchList
<table>
<tr>
<th style="display: none;"></th>
<th>
@Html.DisplayNameFor(model => model.HeaderItem.BranchName)
</th>
<th>
@Html.DisplayNameFor(model => model.HeaderItem.WillWorkAt)
</th>
</tr>
@foreach (var item in Model.Items)
{
@Html.EditorFor(m => item)
}
</table>
查看/共享/ EditorTemplates / ApplicantBranchItem.cshtml：
@model Comair.RI.UI.Models.ApplicantBranchItem
<tr>
<td style="display: none;">
@Html.HiddenFor(m => m.BranchId)
</td>
<td>
@Html.DisplayFor(m => m.BranchName)
</td>
<td>
@Html.EditorFor(m => m.WillWorkAt)
</td>
</tr>
此编辑器在视图中正确呈现,但在后期操作中：
public ActionResult Create(ApplicantProfileModel model)
{
if (ModelState.IsValid)
{
var branches = model.PreferedBranches;
PreferedBranches.Items为null.
我究竟做错了什么？
解决方法
问题是ASP.NET无法弄清楚如何绑定到Model.Items属性.
要修复它替换：
public IEnumerable<ApplicantBranchItem> Items { get; set; }
有了这个：
public List<ApplicantBranchItem> Items { get; set; }
而不是：
@foreach (var item in Model.Items)
{
@Html.EditorFor(m => item)
}
使用这一个：
@for (var i = 0; i < Model.Items.Count; i++)
{
@Html.EditorFor(model => model.Items[i]) // binding works only with items which are accessed by indexer
}
