c# - 如何使用两个模型制作创建类型的 View

Question

我有一个 View 与两个模型绑定(bind)...所以我选择 ViewModel 方法将两个模型与一个 View 绑定(bind)...但是我在创建 Create View 时遇到了问题 type ...但我遇到错误...FeedbackMix 是 ViewModel 在这里...我必须传递查询对象以在布局中显示某些内容，同时我必须创建 Create type view page ...
错误:

CS1061: 'FeedbackMixModel' does not contain a definition for 'Message' and no extension method 'Message' accepting a first argument of type 'FeedbackMixModel' could be found (are you missing a using directive or an assembly reference?)

Controller

public ActionResult Create()
{
   var msg= db.Messages.ToList();
    var feed = db.Feedbacks.ToList();
    FeedbackMixModel vm = new FeedbackMixModel();
    vm.allfeedbacks = feed;
   //this is also create type view 
    return View(vm);
}

查看

@model WebApplication5.Models.FeedbackMixModel
....
@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    ....
    @Html.LabelFor(model => model.Message, htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @Html.EditorFor(model => model.Message, new { htmlAttributes = new { @class = "form-control" } })
       @Html.ValidationMessageFor(model => model.Message, "", new { @class = "text-danger" })
    </div>
    ....
}

View 模型

public class FeedbackMixModel
{
    public List<UserManager> allUserManagers { get; set; }
    public List<Feedback> allfeedbacks { get; set; }
    public List<Package> allpackages { get; set; }
    public List<Messages> allmessages { get; set; }
}

错误行

Line 16: @Html.LabelFor(model => model.Message, htmlAttributes: new { @class = "control-label col-md-2" })

Answer 1

您的 FeedbackViewModel 上没有名为 Message 的属性，您的 LabelFor() 助手需要它，所以它没有知道如何绑定(bind)它:

public  class FeedbackMixModel
{
    public List<UserManager> allUserManagers { get; set; }
    public List<Feedback> allfeedbacks { get; set; }
    public List<Package> allpackages { get; set; }
    public List<Messages> allmessages { get; set; }

    // No property named Message here
}

如果你想要这样的东西，你需要添加属性并在将它传递给模型之前填充它。

您确定您不是要循环遍历您的 allMessages 属性并从这些单独的元素访问它吗？

<h4>Messages</h4>
<hr />
@foreach(var message in Model.allMessages)
{
    <div class="form-group">
       @Html.LabelFor(message => message.Message, htmlAttributes: new { @class = "control-label col-md-2" })
       <div class="col-md-10">
             @Html.EditorFor(message => message.Message, new { htmlAttributes = new { @class = "form-control" } })
             @Html.ValidationMessageFor(message=> message.Message, "", new { @class = "text-danger" })
        </div>
    </div>
}