Question

我正在尝试验证我的模型。它每次都是假的。下面是我的控制器，视图和型号代码。有没有人有这个想法？

我的控制器就像：

    [HttpPost]
    public ActionResult Registration(Register reg)
    {

            if (ModelState.IsValid)
            {
               //some code
            }
            else
            {
                var errors = ModelState.Values.SelectMany(v => v.Errors);
              //some code
            }
        }

我的观点就像

    @using (Html.BeginForm(null, null, FormMethod.Post, new { enctype = "multipart/form-data", id = "ArcherRegistration" }))
    {
<body>
                    <legend>Details</legend>
                    <div class="top">
                        @Html.Label("Select School: ")                     
                        @*@Html.DropDownListFor(model => model.lstSchool, new SelectList(Model.lstSchool, "Key", "Value"),new { @class = "defaultTextBox", @id = "ddlSchools"})*@                                         
                        @Html.DropDownListFor(m => m.selectedSchool, 
                        new SelectList(Model.lstSchool, "Key", "Value"),"--Select--",
                        new { @class = "defaultTextBox", @id = "ddlSchools"})
                        @Html.ValidationMessageFor(model => model.selectedSchool,"",new {@class="field-validation-error"})
                    </div>
                    <div class="top">
                        @Html.Label("Enter Name: ")
                        @Html.TextBoxFor(model=>model.Name, "",new { @class = "defaultTextBox",@maxlength = "50"})
                        @Html.ValidationMessageFor(model => model.Name)
                    </div>
                    <div class="top">
                        @Html.Label("Select Archer Gender: ")            
                        @Html.DropDownListFor(m => m.selectedGender, 
                   new SelectList(Model.Gender, "Value", "Text"), "--Select--",
                        new {@class = "defaultTextBox"})   
                        @Html.ValidationMessageFor(model => model.selectedGender)          
                    </div> 
</body>
    }

我的模特是：

 public class Register
    {


        public int tourID {get ; set;}
        [Required]
        [Display(Name = "School")]
        public string selectedSchool { get; set; }
        public Dictionary<int, string> lstSchool { get; set; }

        [Required]
        [MaxLength(50, ErrorMessage = "Limit exceeds 50")]
        [RegularExpression("^[a-zA-Z ]*$", ErrorMessage = "Only characters are allowed")]
        [Display(Name = "Archer Name")]
        public string ArcherName { get; set; }

        [Required]
        [Display(Name = "Gender")]
        public string selectedGender { get; set; }
        public IEnumerable<SelectListItem> Gender { get; set; }

        [Required]
        [Display(Name = "Grade")]
        public string selectedGrade { get; set; }
        public Dictionary<int, string> lstGrade { get; set; }

    }

即使我填写模型中的所有细节，我的模型也不会验证。它抛出System.InvalidOperationException：参数转换错误。

Answer 1

下拉列表需要IEnumerable<SelectListItem>，但这是一个接口，而不是一个可靠的实现......例如＆＃34;我序列化时应该创建什么样的IEnumerable？我不知道！＆＃34;

将该成员更改为List<SelectListItem>

    [Required]
    [Display(Name = "Gender")]
    public string selectedGender { get; set; }

    public List<SelectListItem> Gender { get; set; }

由于该列表是只读数据，因此根本无法将其发送回服务器。只需将其放入ViewBag即可。其他两个基于Dictionary的成员也是如此。

只需确保在视图中将ViewBag属性强制转换为正确的类型，否则它将假定object并因其他错误而失败：）

{System.InvalidOperationException：从类型'System.String'到类型'System.Collections.Generic.KeyValuePair的参数转换

1 个答案: