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我创建了一个表单，当我用它加载页面时，我会在提交表单之前看到验证消息。为什么？你可以从 github 下载我的代码

类似的问题。这是因为 mvc4

@model MyMustAgreeValidation.Models.NewUserProfileModel
@using (Html.BeginForm())
{
    @Html.ValidationSummary(true)
    <fieldset>
        @Html.MyEditFor(m=>m.Login)
        @Html.MyEditFor(m=>m.Password)
        @Html.MyEditFor(m=>m.ConfirmPassword)
        @Html.MyEditFor(m=>m.DisplayName)
        @Html.MyEditFor(m=>m.Email)
        @Html.MyEditFor(m=>m.Homepage)
        @Html.MyEditFor(m=>m.AgreementAccepted)
        <p><input type="submit" value="@CreateRes.CreateProfileButton"/></p>
    </fieldset>
}

Html.MyEditFor在哪里

public static MvcHtmlString MyEditFor<TModel, TProperty>(this HtmlHelper<TModel> html, Expression<Func<TModel, TProperty>> expression)
    {
        return html.Partial("Item", new LabelEditorValidation() { Label = html.LabelFor(expression), Editor = html.EditorFor(expression), Validation = html.ValidationMessageFor(expression) });
    }

并且Item是部分观点：

@model MyMustAgreeValidation.Models.LabelEditorValidation
<div class="editor-label">
    @Model.Label
</div>
<div class="editor-field">
    @Model.Editor
    @Model.Validation
</div>

标签编辑器验证：

public class LabelEditorValidation
{
    public MvcHtmlString Label { get; set; }
    public MvcHtmlString Editor { get; set; }
    public MvcHtmlString Validation { get; set; }
}

脚本包括：

 <script src="/Scripts/jquery-1.7.1.js"></script>        
 <script src="/Scripts/jquery.unobtrusive-ajax.js"></script>
 <script src="/Scripts/jquery.validate.js"></script>
 <script src="/Scripts/jquery.validate.unobtrusive.js"></script>
 <script src="/Scripts/Validation/EqualAttribute.js"></script>

表单模型 NewUserProfileModel：

 public class NewUserProfileModel : UserProfileModel, IValidatableObject
{
    [Display(Name="Password", ResourceType = typeof(NewUserProfileRes))]
    [DataType(DataType.Password)]
    [Required(ErrorMessageResourceName = "FieldIsRequired", ErrorMessageResourceType = typeof(ErrorsRes))]
    [StringLengthRange(6, 64, ErrorMessageResourceType = typeof(ErrorsRes), ErrorMessageResourceName = "InvalidStringLength")]
    public string Password { get; set; }


    [Display(Name="ConfirmPassword", ResourceType = typeof(NewUserProfileRes))]
    [DataType(DataType.Password)]
    [Compare("Password", ErrorMessageResourceType = typeof(NewUserProfileRes), ErrorMessageResourceName = "PasswordsDontMatch")]
    public string ConfirmPassword { get; set; }

    [Display(Name="AgreementAccepted", ResourceType = typeof(NewUserProfileRes))]
    [Equal(true, ErrorMessageResourceType = typeof(NewUserProfileRes), ErrorMessageResourceName = "MustAgreeWithEULA")]
    public bool AgreementAccepted { get; set; }

    public NewUserProfileModel()
    {
        var property = GetType().GetProperty("Login");
        var list = property.GetCustomAttributes(true);
        foreach (var item in list)
        {
            Console.WriteLine(item);
        }
    }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        var userRepository = new UserRepository();
        if (userRepository.IsLoginExists(Login))
        {
            yield return new ValidationResult(NewUserProfileRes.LoginAlreadyExists, new []{"Login"});
        }
    }

用户档案模型：

 public class UserProfileModel
{
    [Display(Name = "Login", ResourceType = typeof(UserProfileRes))]
    [DataType(DataType.Text)]
    [Required(ErrorMessageResourceName = "FieldIsRequired", ErrorMessageResourceType = typeof(ErrorsRes))]
    [StringLengthRange(3, 64, ErrorMessageResourceName = "InvalidStringLength", ErrorMessageResourceType = typeof(ErrorsRes))]
    public string Login { get; set; }


    [Display(Name="DisplayName", ResourceType = typeof(UserProfileRes))]
    [DataType(DataType.Text)]
    [Required(ErrorMessageResourceName = "FieldIsRequired",
        ErrorMessageResourceType = typeof(ErrorsRes))]
    [StringLengthRange(3, 32, 
        ErrorMessageResourceName = "InvalidStringLength",
        ErrorMessageResourceType = typeof(ErrorsRes))]
    public string DisplayName { get; set; }


    [Display(Name = "Email", ResourceType = typeof(UserProfileRes))]
    [DataType(DataType.EmailAddress)]
    [Required(ErrorMessageResourceType = typeof(ErrorsRes), ErrorMessageResourceName = "FieldIsRequired")]
    [RegularExpression(@"[\w\.-]*[a-zA-Z0-9_]@[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]", ErrorMessageResourceType = typeof(ErrorsRes), ErrorMessageResourceName = "InvalidEmailAddress")]
    [StringLength(64, ErrorMessageResourceType = typeof(ErrorsRes), ErrorMessageResourceName = "StringTooLong")]
    public string Email { get; set; }

    [Display(Name="Homepage", ResourceType = typeof(UserProfileRes))]
    [DataType(DataType.Url)]
    [RegularExpression(@"(http(s)?://)?([\w-]+\.)+[\w-]+(/[\w- ;,./?%&=]*)?", ErrorMessageResourceType = typeof(ErrorsRes), ErrorMessageResourceName = "IvalidUrl")]
    [StringLength(96,
        ErrorMessageResourceType = typeof(ErrorsRes), ErrorMessageResourceName = "StringTooLong")]
    public string Homepage { get; set; }
}

EqualAttribute.js：

jQuery.validator.addMethod("equal", function (value, element, param) {
    if($(element).attr("type")=="checkbox")
    {
        value = String($(element).attr("checked"));
        param = param.toLowerCase();
    }
    return (value == param);
});

jQuery.validator.unobtrusive.adapters.addSingleVal("equal", "valuetocompare");
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