堆栈内存溢出
  繁体   English   中英

用于检查我的模型属性中的重复项的自定义验证属性未触发

[英]Custom validation attribute to check for duplicates among my model properties is not firing

 原文  2015-07-07 17:11:33  0   2    c#/ asp.net-mvc/ validation/ asp.net-mvc-4/ customvalidator

问题描述

我想为我的模型添加一个自定义验证属性，以检查是否有任何答案包含重复项。 也就是说，如果用户为任何字段输入相同的答案，我想在输入重复答案时显示错误。

这是我的模特： 

public class SecurityQuestions
{
    public int Question1Id { get; set; }
    public int Question2Id { get; set; }
    public int Question3Id { get; set; }
    public int Question4Id { get; set; }
    public int Question5Id { get; set; }
    public int Question6Id { get; set; }

    [UniqueAnswersOnly]
    public string Answer1 { get; set; }
    [UniqueAnswersOnly]
    public string Answer2 { get; set; }
    [UniqueAnswersOnly]
    public string Answer3 { get; set; }
    [UniqueAnswersOnly]
    public string Answer4 { get; set; }
    [UniqueAnswersOnly]
    public string Answer5 { get; set; }
    [UniqueAnswersOnly]
    public string Answer6 { get; set; }
}

这是我对自定义属性的尝试： 

public class UniqueAnswersOnly: ValidationAttribute, IClientValidatable
    {

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            //Get a list of all properties that are marked with [UniqueAnswersOnly]
            var props = validationContext.ObjectInstance.GetType().GetProperties().Where(
                prop => Attribute.IsDefined(prop, typeof(UniqueAnswersOnly)));

            var values = new HashSet<string>();

            //Read the values of all other properties
            foreach(var prop in props)
            {
                var pValue = (string)prop.GetValue(validationContext.ObjectInstance, null);
                if (prop.Name!=validationContext.MemberName && !values.Contains(pValue))
                {
                    values.Add(pValue);
                }
            }

            if (values.Contains(value))
            {
                return new ValidationResult("Duplicate answer", new[] { validationContext.MemberName });
            }
            return null;
        }

        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            var rule = new ModelClientValidationRule()
            {
                ErrorMessage = metadata.DisplayName + " is required!",
                ValidationType = "duplicateanswers"
            };

            yield return rule;
        }
    }

我现在遇到的问题是即使我输入重复的答案，验证也是成功的。 我仍然可以继续下一个对话框（如果输入重复项，我希望验证失败）。 我认为这是因为我的自定义属性没有被触发或被击中，因为我添加了断点但没有被击中。

在我的控制器中，我有if(ModelState.IsValid) { //continue to next dialog}并且模型状态确实返回有效。

2 个解决方案

解决方案1
 2 已采纳  2015-07-07 18:15:23

您可以创建一个自定义验证属性，如下所示： 

public class UniqueAnswersOnly : ValidationAttribute
{
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        //Get a list of all properties that are marked with [UniqueAnswersOnly]
        var props = validationContext.ObjectInstance.GetType().GetProperties().Where(
            prop => Attribute.IsDefined(prop, typeof(UniqueAnswersOnly)));

        var values = new HashSet<string>();

        //Read the values of all other properties
        foreach(var prop in props)
        {
            var pValue = (string)prop.GetValue(validationContext.ObjectInstance);
            if (prop.Name!=validationContext.MemberName && !values.Contains(pValue))
            {
                values.Add(pValue);
            }
        }

        if (values.Contains(value))
        {
            return new ValidationResult("Duplicate answer", new[] { validationContext.MemberName });
        }
        return null;
    }
}

这是一个测试用例： 

public class SecurityQuestions
{
    public int Question1Id { get; set; }
    public int Question2Id { get; set; }
    public int Question3Id { get; set; }
    public int Question4Id { get; set; }
    public int Question5Id { get; set; }
    public int Question6Id { get; set; }
    [UniqueAnswersOnly]
    public string Answer1 { get; set; }
    [UniqueAnswersOnly]
    public string Answer2 { get; set; }
    [UniqueAnswersOnly]
    public string Answer3 { get; set; }
    [UniqueAnswersOnly]
    public string Answer4 { get; set; }
    [UniqueAnswersOnly]
    public string Answer5 { get; set; }
    [UniqueAnswersOnly]
    public string Answer6 { get; set; }
}


class Program
{
    static void Main(string[] args)
    {
        var questions = new SecurityQuestions();
        questions.Answer1 = "Test";
        questions.Answer2 = "Test";
        questions.Answer3 = "Test3";
        questions.Answer4 = "Test4";
        questions.Answer5 = "Test5";
        questions.Answer6 = "Test6";

        var vc = new ValidationContext(questions, null, null);
        var results = new List<ValidationResult>();
        var validationResult = Validator.TryValidateObject(questions, vc, results, true);
    }
}

编辑：

我创建了一个默认的MVC项目并添加了您当前的代码。 验证工作得很好。

我把它添加到家庭控制器： 

    public ActionResult AskQuestions()
    {
        var questions = new SecurityQuestions();

        return View(questions);
    }

    [HttpPost]
    public ActionResult CheckQuestions(SecurityQuestions questions)
    {
        if (ModelState.IsValid)
        {
            return View();
        }            
        else
        {
            return HttpNotFound();
        }
    }

AskQuestions视图如下所示： 

@model WebApplicationValidation.Models.SecurityQuestions

@{
    ViewBag.Title = "AskQuestions";
}

<h2>AskQuestions</h2>


@using (Html.BeginForm("CheckQuestions", "Home",FormMethod.Post))
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>SecurityQuestions</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.Question1Id, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Question1Id, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Question1Id, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Question2Id, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Question2Id, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Question2Id, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Question3Id, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Question3Id, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Question3Id, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Question4Id, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Question4Id, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Question4Id, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Question5Id, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Question5Id, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Question5Id, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Question6Id, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Question6Id, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Question6Id, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Answer1, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Answer1, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Answer1, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Answer2, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Answer2, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Answer2, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Answer3, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Answer3, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Answer3, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Answer4, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Answer4, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Answer4, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Answer5, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Answer5, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Answer5, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Answer6, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Answer6, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Answer6, "", 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")
}

如果我运行应用程序，如果我输入两个相同的答案，则ModelState.IsValid（）为false。 在验证例程中设置断点表明它正在运行。

解决方案2
 1  2015-07-07 18:07:57

您可以在模型中实现IValidatableObject接口，如下所示，并使用jQuery来处理客户端的验证。 

public class SecurityQuestions : IValidatableObject
{
    public int Question1Id { get; set; }

    public int Question2Id { get; set; }

    public int Question3Id { get; set; }

    public int Question4Id { get; set; }

    public int Question5Id { get; set; }

    public int Question6Id { get; set; }

    public string Answer1 { get; set; }

    public string Answer2 { get; set; }

    public string Answer3 { get; set; }

    public string Answer4 { get; set; }

    public string Answer5 { get; set; }

    public string Answer6 { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        var securityAnswers = new List<string>();
        securityAnswers.Add(this.Answer1);
        securityAnswers.Add(this.Answer2);
        securityAnswers.Add(this.Answer3);
        securityAnswers.Add(this.Answer4);
        securityAnswers.Add(this.Answer5);
        securityAnswers.Add(this.Answer6);

        bool hasDuplicates = securityAnswers.GroupBy(x => x).Where(g => g.Count() > 1).Any();

        if (hasDuplicates)
        {
            yield return new ValidationResult(
                "There are duplicate Answers...");
        }
    }
}

暂无
暂无

声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.

相关问题 如何使用由 model 属性组成的参数创建自定义验证属性 具有自定义验证属性的模型验证 是否有模型验证属性可以在不使用自定义代码的情况下检查参数类型？ 创建定制模型验证属性 访问其他模型属性的自定义验证方法 ASP.NET Core自定义验证属性未触发 如何修改我的视图模型以仅检查特定属性的验证？ 自定义验证属性，用于将my属性的值与模型类中的另一个属性值进行比较 三层深度模型的自定义验证属性 在自定义验证属性中引用MVC实体模型
相关标签
 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM