public class Review
{
public int ReviewId { get; set; }
public bool RecommendationOne
{
// hook property - gets/set values in the ICollection
}
public bool RecommendationTwo { // etc }
public ICollection<Recommendation> Recommendations { get; set; }
}
建议如下：
public class Recommendation
{
public byte RecommendationTypeId
}
我还有一个名为RecommendationType的枚举,用于将上述建议映射到. (基于RecommendationTypeId).
总而言之 – 单个Review有很多Recommendations,并且每个Recommendations都映射到特定的枚举类型,我公开了钩子属性以简化模型绑定/代码.
所以,在视图上：
@Html.EditorFor(model => model.Recommendations,"Recommendations")
很简单.
现在,对于编辑器模板,我想显示每个可能的RecommendationType(枚举)的复选框,如果模型有该推荐(例如编辑视图),我选中该复选框.
这就是我所拥有的：
@model IEnumerable<xxxx.DomainModel.Core.Posts.Recommendation>
@using xxxx.DomainModel.Core.Posts;
@{
Layout = null;
}
<table>
@foreach (var rec in Enum.GetValues(typeof(RecommendationType)).Cast<RecommendationType>())
{
<tr>
<td>
@* If review contains this recommendation,check the Box *@
@if (Model != null && Model.Any(x => x.RecommendationTypeId == (byte)rec))
{
@* How do i create a (checked) checkBox here? *@
}
else
{
@* How do i created a checkBox here? *@
}
@rec.ToDescription()
</td>
</tr>
}
</table>
正如评论所示 – 我不知道如何使用@ Html.CheckBoxFor.通常,它采用基于模型的表达式,但我更确定如何基于当前循环的枚举值绑定到hook属性.例如,它需要动态地执行@ Html.CheckBoxFor(x => x.RecommendationOne),@ Html.CheckBoxFor(x => x.RecommendationTwo)等.
我现有的解决方案(有效)涉及手动构建< input>. (包括隐藏的字段).
但是,由于我只是掌握了编辑器模板,希望有经验的人可以指出我处于“强烈打字”的方向.
或者有更好的方式(HTML Helper)我能做到这一点吗？
解决方法
public enum RecommendationType { One,Two,Three }
public class Reviewviewmodel
{
public IEnumerable<Recommendationviewmodel> Recommendations { get; set; }
}
public class Recommendationviewmodel
{
public RecommendationType RecommendationType { get; set; }
public bool IsChecked { get; set; }
}
然后是控制器：
public class HomeController : Controller
{
public ActionResult Index()
{
// TODO: query the repository to fetch your model
// and use AutoMapper to map between it and the
// corresponding view model so that you have a true/false
// for each enum value
var model = new Reviewviewmodel
{
Recommendations = new[]
{
new Recommendationviewmodel {
RecommendationType = RecommendationType.One,IsChecked = false
},new Recommendationviewmodel {
RecommendationType = RecommendationType.Two,IsChecked = true
},new Recommendationviewmodel {
RecommendationType = RecommendationType.Three,}
};
return View(model);
}
[HttpPost]
public ActionResult Index(Reviewviewmodel model)
{
// Here you will get for each enum value the corresponding
// checked value
// TODO: Use AutoMapper to map back to your model and persist
// using a repository
return RedirectToAction("Success");
}
}
和相应的视图(〜/ Views / Home / Index.cshtml)：
@model YourAppName.Models.Reviewviewmodel @{ ViewBag.Title = "Index"; } @using (Html.BeginForm()) { @Html.EditorFor(model => model.Recommendations) <input type="submit" value="Go" /> }
最后是编辑模板(〜/ Views / Home / EditorTemplates / Recommendationviewmodel.cshtml)
@model YourAppName.Models.Recommendationviewmodel <div> @Html.HiddenFor(x => x.RecommendationType) @Model.RecommendationType @Html.CheckBoxFor(x => x.IsChecked) </div>
现在,视图代码将按原样清理.没有ifs,没有循环,没有LINQ,没有反射,这是控制器/映射器层的责任.因此,每当您发现自己在视图中编写一些高级C#逻辑时,我建议您重新考虑视图模型并根据需要进行调整.这就是视图模型的用途：尽可能接近视图逻辑.
