MVC模型绑定保持值为NULL

本文关键字：NULL 模型 绑定 MVC | 更新日期: 2023-09-27 18:09:18

我试图让自定义模型绑定工作，但由于某种原因，值没有设置。与工作代码相比，代码似乎很轻，但仍然没有绑定。我猜是我遗漏了一些小事。

自定义模型:

//Cluster is from Entity Framework
//BaseViewModelAdmin defines:
public List<KeyValuePair<string, string>> MenuItems;
public IPrincipal CurrentUser = null;
public Foundation Foundation; //also from Entity Framework
public class AdminClusterCreateModel : BaseViewModelAdmin
{
    public Cluster Item;
    public AdminClusterCreateModel()
    {
        Item = new Cluster();
    }
}

视图格式如下:

@using (Html.BeginForm()) {
  @Html.ValidationSummary(true)
  <fieldset>
      <legend>Cluster</legend>
      <div class="editor-label">
          @Html.LabelFor(model => model.Item.Active)
      </div>
      <div class="editor-field">
          @Html.EditorFor(model => model.Item.Active)
          @Html.ValidationMessageFor(model => model.Item.Active)
      </div>

      <div class="editor-label">
          @Html.LabelFor(model => model.Item.Name)
      </div>
      <div class="editor-field">
          @Html.EditorFor(model => model.Item.Name)
          @Html.ValidationMessageFor(model => model.Item.Name)
      </div>
      <p>
          <input type="submit" value="Create" />
      </p>
  </fieldset>
}

和控制器:

[HttpPost]
public ActionResult Create(AdminClusterCreateModel model, FormCollection form)
{
    if(ModelState.IsValid) //true
    {
        var test = form["Item.Name"]; //Value is correct from form (EG: Test)
        UpdateModel(model);  //no error
    }
    //At this point model.Item.Name = null <--- WHY?
    return View(model);
}

请求群集

public partial class Cluster
{
    public Cluster()
    {
        this.Team = new HashSet<Team>();
    }
    public long Id { get; set; }
    public System.DateTime Created { get; set; }
    public System.DateTime Modified { get; set; }
    public bool Active { get; set; }
    public long FoundationId { get; set; }
    public string Name { get; set; }
    public virtual Foundation Foundation { get; set; }
    public virtual ICollection<Team> Team { get; set; }
}

MVC模型绑定保持值为NULL

DefaultModelBinder显式地作用于'Properties'，而不是'Fields'

将AdminClusterCreateModel中的public Cluster Item改为public Cluster Item {get; set;}应该可以达到目的。

public class AdminClusterCreateModel : BaseViewModelAdmin
{
    public Cluster Item {get; set;}
    public AdminClusterCreateModel()
    {
        Item = new Cluster();
    }
 }

对

这是一个微不足道的和一个角大小写，但是如果它可能对某人有所帮助:

如果你的模型有一个名为model的属性，这将导致DefaultModelBinder返回null。

public class VehicleModel
{
    public string Model { get; set; }
}
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