使用ViewModel填充ListBox并传回其内容 [英] Populating ListBoxfor with ViewModel and passing back its contents
问题描述
我正在努力找出如何将我的模型（未修改）传回给我的控制器。我已经尝试绑定我的ViewModel许多不同的HTML.Helpers和什么不是。我可以得到我的数据绑定和显示，但是我不能让ViewModel发回到我的控制器。
I am struggling to figure out how to pass back my model (unmodified) back to my controller. I have tried binding my ViewModel to many different HTML.Helpers and what not. I can get my data to bind and display, but I cannot get the ViewModel to post back to my controller.
我有以下ViewModels：
I have the following ViewModels:
public class MediaProviderViewModel : ViewModelBase
{
public int MediaProviderId { get; set; }
public string MediaProviderName { get; set; }
public static MediaProviderViewModel FromEntity(MediaProvider entity)
{
if (entity == null)
{
return (null);
}
return (new MediaProviderViewModel()
{
MediaProviderId = entity.MediaProviderId,
MediaProviderName = entity.Name,
});
}
public static IEnumerable<MediaProviderViewModel> FromEntityList(IEnumerable<MediaProvider> entities)
{
return entities == null ? null : entities.Select(FromEntity).OrderBy(mp => mp.MediaProviderName);
}
}
public class SystemConfigViewModel : ViewModelBase
{
[DisplayName("Media Providers")]
public IEnumerable<MediaProviderViewModel> MediaProviders { get; set; }
public SystemConfigViewModel()
{
}
public static SystemConfigViewModel FromEntity(Entities db)
{
return new SystemConfigViewModel()
{
MediaProviders = MediaProviderViewModel.FromEntityList(db.MediaProviders)
};
}
}
控制器：
public class SystemConfigController : CommonBaseController
{
//
// GET: /SystemConfig/
public ActionResult Index()
{
SystemConfigViewModel model = SystemConfigViewModel.FromEntity(_db);
return View(model);
}
[HttpPost]
public ActionResult Index(SystemConfigViewModel model)
{
return View(model);
}
查看：
<html>
<body>
@using (Html.BeginForm("Index", "SystemConfig"))
{
@Html.ListBoxFor(model => model.MediaProviders, new SelectList(Model.MediaProviders, "MediaProviderId", "MediaProviderName"), new { @size = "30" })
}
</body>
</html>
我已经尝试过遍历项目并将其编入索引：
I have tried iterating through the items and indexing them like such:
//在一个for循环中用不同的帮助器包围
//Surrounded in a for loop with different helpers
model => model.MediaProviders[i].MediaProviderId
仍然没有回传。我可以帮助我做错什么吗？我尝试了谷歌搜索，但没有什么真正的价值弹出我的情况。
Still nothing is passed back. Could I get some help as to what I am doing wrong? I tried googling but nothing really of value popped up for my case.
推荐答案
您应该在视图模型中添加一个附加属性，将所选值绑定到（并更改 MediaProviders 到 SelectList 也会更容易）
You should include an additional property in you view model to bind the selected values to (and changing the MediaProviders to a SelectList would also make it easier)
public class SystemConfigViewModel : ViewModelBase
{
public IEnumerable<int> SelectedProviders { get; set; } //bind to this
public SelectList MediaProviders { get; set; } // populate this in the controller
}
然后在视图中
@Html.ListBoxFor(m=> m.SelectedProviders , Model.MediaProviders, new { @size = "30" })
发回时， SelectedProviders 属性将包含所选项目的ID（ MediaProviderId ）。
When you post back, the SelectedProviders property will contain the ID's (MediaProviderId) of the selected items.
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