c# - 模型的验证消息不会显示为 View 模型中的属性

Question

我一直在努力处理 asp.net 中的模型验证消息

我有一个 View 模型使用的模型。如果用户未填写必填字段，我希望我的 View 显示验证错误。

当必填字段未填写(预期行为)但我看不到时，我的 ModelState.IsValid 为假任何错误信息

我的模型类:

public class Model
{
        [Required(ErrorMessage = "Name is required.")]
        public string Name { get; set; }

        [Required(ErrorMessage = "Adress is required.")]
        public string Adress { get; set; }
}

我的 ViewModel 类:

public class ViewModel
{
        [Required]
        public Model SelectedModel { get; set; }

        public string Title { get; set;}
}

我的 Controller :

        [HttpPost]
        public ActionResult Create(ViewModel vm)
        {
            try
            {
                if (ModelState.IsValid)
                {
                    bool result = *DatabaseStuff*
                    if(result == true)
                    {
                        return RedirectToAction("Index");
                    }
                    else
                    {
                        return View();
                    }
                }
                return RedirectToAction("Index",vm);
            }
            catch
            {
                return View();
            }
        }

我的看法

@model ViewModel

@using (Html.BeginForm("Create", "MyController", FormMethod.Post))
{
    @Html.AntiForgeryToken()

    <div class="box box-primary">
        <div class="box-header with-border">
            <h4 class="box-title">ViewModel Form</h4>
        </div>
        <div class="box-body">
        <div class="row">
            <div class="col-md-12">
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })

        <div class="form-group">
            @Html.LabelFor(model => model.Title, htmlAttributes: new { @class = "control-label" })
                @Html.EditorFor(model => model.Title, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Title, "", new { @class = "text-danger" })
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.SelectedModel.Name, htmlAttributes: new { @class = "control-label" })
                @Html.EditorFor(model => model.SelectedModel.Name, null, "SelectedModel_Name",new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.SelectedModel.Name, "", new { @class = "text-danger", @data_valmsg_for = "SelectedModel_Name" })
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.SelectedModel.Adress, htmlAttributes: new { @class = "control-label" })
                @Html.EditorFor(model => model.SelectedModel.Adress, null, "SelectedModel_Adress",new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.SelectedModel.Adress, "", new { @class = "text-danger", @data_valmsg_for = "SelectedModel_Adress" })
        </div>

    </div>
    </div>
    </div>
        <div class="form-group">
            <div class="box-footer">
                <input type="submit" value="Create" class="btn btn-success pull-right" />
            </div>
        </div>

    </div>

}

谢谢。

Answer 1

我认为您应该在 ModelState 无效时返回 View。

• Return View 不会发出新的请求，它只是渲染 View 无需更改浏览器地址栏中的 URL。

• 返回 RedirectToAction 发出的新请求和浏览器中的 URL
  地址栏使用 MVC 生成的 URL 进行更新。

      try
      {
          if (ModelState.IsValid)
          {
              bool result = *DatabaseStuff*
              if(result == true)
              {
                  return RedirectToAction("Index");
              }
              else
              {
                  return View();
              }
          }
          return View();
      }