@ Html.ValidationMessageFor不工作

Question

嗨,大家好,我看过谷歌,雅虎,无法找到答案,为什么它是我的'@Html.ValidationMessageFor不起作用.当我运行应用程序时没有任何反应它允许输入所有内容.当我尝试编辑下面编辑视图中的项目时,它也会崩溃.我有以下内容:

<div class="editor-label">
       @* @Html.LabelFor(model => model.Posted)*@
    </div>
    <div class="editor-field">
        @Html.HiddenFor(model => model.Posted, Model.Posted = DateTime.Now)
        @Html.ValidationMessageFor(model => model.sendinghome)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.Cartypes)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.Cartypes)
        @Html.ValidationMessageFor(model => model.Cartypes)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.RegNum)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.RegNum)
        @Html.ValidationMessageFor(model => model.RegNum)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.Regprice)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.Image)
        @Html.ValidationMessageFor(model => model.Regprice)
    </div>

Answer 1

以下是验证的工作原理.

假设您有以下型号:

public class MyModel {
    [Required]
    public string MyProperty { get; set; }
}

请注意该Required属性,它是一个数据注释属性,指定该属性MyProperty是必填字段.

MyModel由以下视图(MyView.cshtml)使用:

@model MyNamespace.MyModel

@using (Html.BeginForm("MyAction", "MyController")) {
    @Html.LabelFor(m => m.MyProperty)
    @Html.TextBoxFor(m => m.MyProperty)
    @Html.ValidationMessageFor(m => m.MyProperty)

    <input type="submit" value="Click me">
}

然后,当此表单发布到MyAction操作时MyController,将执行模型的验证.您需要做的是检查您的模型是否有效.可以使用ModelState.IsValid酒店完成.

[HttpPost]
public ActionResult MyAction(MyModel model) {
    if (ModelState.IsValid) {
         // save to db, for instance
         return RedirectToAction("AnotherAction");
    }
    // model is not valid
    return View("MyView", model);
}

如果验证失败,将使用ModelState对象中存在的不同错误再次呈现视图.ValidationMessageFor助手将使用和显示这些错误.