这个问题一直困扰我两天了。有一些类似的帖子，但没有一个完全解决我的问题。
使用MVC-3，Razor语法：
– EDIT.cshtml –
@using (Html.BeginForm("Edit","My",FormMethod.Post,new { enctype = "multipart/form-data" }))
{
<!-- Some fields... -->
<div class="editor-field">
@Html.TextAreaFor(m => m.LongDescription)
@Html.ValidationMessageFor(m => m.LongDescription)
</div>
<!-- Some more fields work... Including picture upload (summary).-->
<input name="button" type="submit" value="Add Picture" />
<!-- Picture Item display -->
@foreach(var thumbnail in Model.ThumbnailImagePathAndNames)
{
<img src="@Url.Content(@thumbnail.ThumbnailPicturePath)" alt="" width="200" />
@Html.Ra@R_404_410@ButtonFor(o=>o.SelectedImage,@thumbnail.ImageGUID) Primary Picture
<!-- CheckBox to mark for deletion -->
@Html.CheckBoxFor(o=>thumbnail.Delete) Delete ???????? <!---- Here is a problem - I don't understand how this should work -->
}
<input id="Submit1" name="button" type="submit" value="Complete Edit!" />
}
– MyController.cs –
[HttpPost]
public ActionResult Edit(String button,HttpPostedFileBase file,MyMainModel model)
{
// if button = submit picture,work with picture here and break(long story)
// save model data
// if valid,save and redirect
// not valid or error,load up view like normal but with error messages
model.LoadThumbnails();
return View(model);
}
– MyMainModel.cs –
public class MyMainModel
{
// some properties...
public Guid? SelectedImage { get; set; }
[Display(Name = "Detailed Description")]
public String LongDescription { get; set; }
// some more properties....
// and finally my list of models
public IList<ThumbnailModel> ThumbnailImagePathAndNames { get; set; }
public void LoadThumbnails()
{
// load up initial thumbnail models
this.ThumbnailImagePathAndNames = new List<ThumbnailModel>(readDataService.GetThumbnailModels(this.SomeID));
}
}
– ThumbnailModels.cs –
public class ThumbnailModel
{
public Guid ImageGUID { get; set; }
public String FullSizePicturePath { get; set; }
public String ThumbnailPicturePath { get; set; }
public bool Delete { get; set; }
}
所以有什么问题？好了，当“完成编辑！按钮，MyController的编辑被调用，如所期望的所有MyMainModle的数据在tact ….除了ThumbnailModel的列表 – 那些结果是null。
这应该怎么做？我尝试了许多不同的方法，包括使一个可编辑的模板和使用EditFor(o => …所有无法使用(这变得混乱，因为我不知道EditFor是否应该是整个集合或只是在集合中的一个项目 – 我尝试了两种方式)。所有使用的工作，直到我添加复选框的删除，因此需要检索ThumbnailModels列表检查内部Delete属性值。
谢谢大家的阅读和试图理解这一点。
解决方法
这里有一个例子，我用来说明一些概念：
模型：
public class MyMainModel
{
public Guid? SelectedImage { get; set; }
public string LongDescription { get; set; }
public IEnumerable<ThumbnailModel> ThumbnailImagePathAndNames { get; set; }
public HttpPostedFileBase File { get; set; }
}
public class ThumbnailModel
{
public Guid ImageGUID { get; set; }
public bool Delete { get; set; }
}
控制器：
public class HomeController : Controller
{
public ActionResult Index()
{
var model = new MyMainModel
{
// TODO: fetch from the repository instead of hardcoding
ThumbnailImagePathAndNames = new[]
{
new ThumbnailModel { ImageGUID = Guid.NewGuid() },new ThumbnailModel { ImageGUID = Guid.NewGuid() },}
};
return View(model);
}
[HttpPost]
public ActionResult Index(MyMainModel model)
{
... the model will be properly bound here
}
}
视图：
@model AppName.Models.MyMainModel
@{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
@using (Html.BeginForm("index","home",new { enctype = "multipart/form-data" }))
{
<div class="editor-field">
@Html.TextAreaFor(m => m.LongDescription)
@Html.ValidationMessageFor(m => m.LongDescription)
</div>
<input type="file" name="file" />
<!-- Use different names for the upload and complete submit
buttons so that you can distinguish which one was clicked
in the POST action
-->
<input name="upload" type="submit" value="Add Picture" />
@Html.EditorFor(x => x.ThumbnailImagePathAndNames)
<input name="complete" type="submit" value="Complete Edit!" />
}
编辑器模板：(〜/ Views / Home / EditorTemplates / ThumbnailModel.cshtml)：
@model AppName.Models.ThumbnailModel <!-- Pass the image id as hidden field --> @Html.HiddenFor(x => x.ImageGUID) @Html.CheckBoxFor(x => x.Delete)
