Question

我是MVC的新手。我遇到验证错误的问题，因为我检查了所有数据库字段，我没有发现任何问题，但我仍然收到一个或多个实体验证失败的错误。我无法找到验证错误。

这是我的数据库架构：

public partial class make
{
    public int make_id { get; set; }
    public int category_id { get; set; }
    public string title { get; set; }
    public string imagePath { get; set; }

    public virtual category category { get; set; }
}

以下是我的观点：

@model globalEngineProject.make
@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

@using (Html.BeginForm("Home", "make", FormMethod.Post,
                            new { enctype = "multipart/form-data" }))
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>category</h4>
        <hr />
        @Html.ValidationSummary(true)

        <div class="form-group">
            @Html.LabelFor(model => model.title, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.title)
                @Html.ValidationMessageFor(model => model.title)
            </div>
            </div>
        <div class="form-group">
            @Html.LabelFor(model => model.category_id, "category_id", new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownList("category_id", String.Empty)
                @Html.ValidationMessageFor(model => model.category_id)
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.imagePath, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                <input name="file" type="file" id="file"/>
                @Html.ValidationMessageFor(model => model.imagePath)
            </div>
            </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>

}
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Home([Bind(Include = "make_id,category_id,title")] make make, HttpPostedFileBase file)
        {
            try
            {
                if (ModelState.IsValid)
                {
                    if (file != null && file.ContentLength > 0)
                    {
                        var fileName = Path.GetFileName(file.FileName);
                        var path = Path.Combine(Server.MapPath("~/images/"), fileName);
                        file.SaveAs(path);
                    }
                    db.makes.Add(make);
                    db.SaveChanges();
                }
                ViewBag.category_id = new SelectList(db.categories, "category_id", "category_name", make.category_id);
                return View(make);

                // return View("Index");
            }
            catch (RetryLimitExceededException )
            {
                //Log the error (uncomment dex variable name and add a line here to write a log.
                ModelState.AddModelError("", "Unable to save changes. Try again, and if the problem persists see your system administrator.");
            }
            return View(make);
        }

Answer 1

要扩展Stephen的评论，看起来您没有为imagePath设置值。要检查这一点，您可以在控制器方法中放入以下代码，以找出验证错误的详细信息：

var modelErrors = new List<ModelError>();

foreach (ModelState modelState in ViewData.ModelState.Values) {
    foreach (ModelError error in modelState.Errors) {
        modelErrors.Add(error);
    }
}

这将为您提供调试时可以检查的ModelError列表。这应该给你一个指向哪个字段有错误的指针。

使用ASP.NET MVC和Razor时，一个或多个实体的验证失败

1 个答案: