如何修复MVC应用中的System.ArgumentException参数name为空错误

我正在做一个暑期项目，要开发一个能浏览和筛选候选者的作品集Web应用。已经用SQL数据库存储候选者信息和0-5分的编程语言熟练度评分，搭建MVC应用后，尝试创建新候选者时弹出错误：System.ArgumentException: 'Value cannot be null or empty. Parameter name: name'。我之前没接触过这个开发栈，不知道怎么解决，以下是我的视图代码：

@{
    ViewBag.Title = "Create";
}

<h2>Create</h2>


@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()
    
    <div class="form-horizontal">
        <h4>Candidate</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.Id, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Id, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Id, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.First_Name, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.First_Name, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.First_Name, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Last_Name, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Last_Name, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Last_Name, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Date_of_birth, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Date_of_birth, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Date_of_birth, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Location, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Location, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Location, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Email, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Email, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Email, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.C__NET___ASP, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.C__NET___ASP, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.C__NET___ASP, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.CSS, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.CSS, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.CSS, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.HTML, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.HTML, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.HTML, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Java, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Java, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Java, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.JavaScript, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.JavaScript, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.JavaScript, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Python, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Python, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Python, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Python_Flask, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Python_Flask, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Python_Flask, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

修复方案 #

1. 移除Id输入字段（最可能的原因） #

通常Id是数据库自增主键，不需要用户手动输入。如果你的Candidate模型中Id配置为自增，直接从视图中删除Id的输入区域：

<!-- 删除这段代码 -->
<div class="form-group">
    @Html.LabelFor(model => model.Id, htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @Html.EditorFor(model => model.Id, new { htmlAttributes = new { @class = "form-control" } })
        @Html.ValidationMessageFor(model => model.Id, "", new { @class = "text-danger" })
    </div>
</div>

同时确保模型中Id的特性配置正确：

public class Candidate
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    // 其他字段...
}

2. 检查特殊字段命名 #

视图中的C__NET___ASP字段名是数据库转义后的结果（原字段名可能是C#/.NET/ASP），检查模型类中该字段的定义，确保没有空值绑定问题，比如是否添加了正确的特性（如[Range(0,5)]）。

3. 验证控制器Create方法 #

确保POST方法正确接收模型参数：

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(Candidate candidate)
{
    if (ModelState.IsValid)
    {
        db.Candidates.Add(candidate);
        db.SaveChanges();
        return RedirectToAction("Index");
    }
    return View(candidate);
}

项目优化思路 #

• 拆分模型结构：把编程语言熟练度单独做成Skill模型，和Candidate建立一对多关系，后续添加新语言无需修改主表。
• 无刷新筛选：用AJAX实现实时筛选，根据语言评分、地区等条件动态更新候选者列表。
• 增强表单验证：前端添加实时格式校验（邮箱、日期），后端给模型字段添加[Required]、[EmailAddress]、[Range(0,5)]等特性。
• 分页加载：当候选者数量较多时，实现分页功能，避免页面加载卡顿。

内容的提问来源于stack exchange，提问作者Jamie_Talbot9