mvc 4 中的转换类型错误

Question

我得到： 从类型“System.String”到类型“System.Web.Mvc.SelectListItem”的参数转换失败，因为没有类型转换器可以在这些类型之间进行转换。 将表单发布到控制器时出错，下面是我正在使用的代码：

型号

 public IList<SelectListItem> Gender { get; set; }
 public IList<SelectListItem> Disablity { get; set; }

控制器

public ActionResult Index()
        {
            FormViewModel objStudentModel = new FormViewModel();

            List<SelectListItem> genderNames = new List<SelectListItem>();
            genderNames.Add(new SelectListItem { Text = "Male", Value = "1" });
            genderNames.Add(new SelectListItem { Text = "Female", Value = "2" });
            genderNames.Add(new SelectListItem { Text = "Prefer not to say", Value = "3" });

            objStudentModel.Gender = genderNames1;
            objStudentModel.Disablity = genderNames1;
            return PartialView("ApplicationForm", objStudentModel);

        }

 [HttpPost]
        public ActionResult HandleFormSubmit(string[] gender, string[] disability, FormViewModel model)
        {
            //model not valid, do not save, but return current umbraco page
           if (ModelState.IsValid == false) // this always comes false 
           {
                return CurrentUmbracoPage();
           }
           string form = "Values + Environment.NewLine;"
           if (gender != null)
            { form += "Gender: " + gender[0] + Environment.NewLine; }
            else
            { form += "Gender: " + "Prefer not to say" + Environment.NewLine; }
            if (disability != null)
            { form += "Disability: " + disability[0] + Environment.NewLine; }
            else
            { form += "Disability: " + "Prefer not to say" + Environment.NewLine; }
            return RedirectToCurrentUmbracoPage();
         } 

查看

using (Html.BeginUmbracoForm<FormSurfaceController>("HandleFormSubmit"))
    {

        //var errors = ModelState.Values.SelectMany(v => v.Errors);

        @Html.ValidationSummary();
<div class="col-12 col-sm-12 col-lg-12 ">
                  <label>Are you:</label>
              @foreach (var names1 in @Model.Gender)
              {
                  var tdId = "rd" + names1.Value;
               <input type="radio" id="@tdId" class="chkclass" value="@names1.Text" name="gender" style="padding-right:5px;"/>
                            @names1.Text
                      }

                </div>

            </div>

 <div class="col-12 col-sm-12 col-lg-12 ">
                  @foreach (var names in @Model.Disablity)
                {

                var tdId = "rd" + names.Value;
                   <input type="radio" id="@names.Value" class="chkclass" value="@names.Text" name="disability" style="padding-right:5px;"/>
                    @names.Text
                  }

                </div>}

我已经使用 Visual stdio 进行了调试，错误是在导致模型状态失败的性别列表上生成的。任何我弄错的想法，因为我已经在我的方法中尝试了所有可能的解决方案但没有任何成功，任何帮助和帮助将不胜感激。

谢谢

Answer 1

您的模型属性Gender 和Disablity 在提交表单发布时会发生冲突。 MVC 尝试将无线电输入的选定值（类型为 string[]）转换为您的 ViewModel 属性类型 IList<SelectListItem> Gender

重命名选定的值或添加新属性

模型属性

public IList<SelectListItem> Gender { get; set; }
public IList<SelectListItem> Disablity { get; set; }
public string[] SelectedGender { get; set; }
public string[] SelectedDisablity { get; set; }

查看

将您的输入重命名为“SelectedGender”和“SelectedDisablity”

@foreach (var names1 in @ViewBag.Gender)
{
    var tdId = "rd" + names1.Value;
    <input type="radio" class="chkclass" value="@names1.Text" name="SelectedGender" />
    @names1.Text
}

动作

也在动作参数中

  public ActionResult HandleFormSubmit(string[] selectedGender, string[] selectedDisability, FormViewModel model){ //...