Question

I have a simple MVC controller and view and model (I removed all other codes to figure out the problem) Model is a simple one property class:

public class SiteFileUploadModel
{
    [Required]
    public int ActivePage { get; set; }
}

视图也非常简单 :

@model Models.SiteFileUploadModel
@{
      ViewBag.Title = "Index";
 }
 <h2>Index</h2>
 @if (Model != null)
 {
      using (this.Html.BeginForm("Index", "SiteFileUpload"))
      {
           @Html.Hidden("ActivePage",Model.ActivePage)
           @Model.ActivePage
           switch (Model.ActivePage)
           {
                case 1:
                    <p>Page 1</p>
                    break;
                case 2:
                    <p>Page 2</p>
                    break;
           }
           <button type="submit" name="actionButtons">Previous</button>
           <button type="submit" name="actionButtons">Next</button>
      }
  }

控制器只有一个方法:

public class SiteFileUploadController : Controller
{
    //
    // GET: /FileUpload/SiteFileUpload/
    [HttpGet]
    public ActionResult Index()
    {
        var model = new SiteFileUploadModel();
        model.ActivePage = 1;
        return View(model);
    }

    [HttpPost]
    public ActionResult Index(SiteFileUploadModel model, string actionButtons)
    {
        if (actionButtons == "Next")
        {
            model.ActivePage++;

        }
        if (actionButtons == "Previous")
        {
            model.ActivePage--;
        }

        return View(model);
    }

}

当我运行它并按下下一个时, 我可以看到这个模型。激活的Page 变成 2, 它在输出上也显示( 它显示 2 和第 2 页), 但隐藏的值仍然是 1 。事实上隐藏的值总是 1, 它不跟随活动Page 的真实值。我还用同样效果生成隐藏字段来测试它! 问题是什么?

Answer 1

见。

简言之,您需要先清除“模型状态”,然后再重现视图,因为 Html 助手将使用模型状态,而不是模型的数据。

在控制器动作中添加以下语句:

ModelState.Clear();

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