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用於檢查我的模型屬性中的重復項的自定義驗證屬性未觸發

[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

問題描述

我想為我的模型添加一個自定義驗證屬性，以檢查是否有任何答案包含重復項。 也就是說，如果用戶為任何字段輸入相同的答案，我想在輸入重復答案時顯示錯誤。

這是我的模特： 

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; }
}

這是我對自定義屬性的嘗試： 

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;
        }
    }

我現在遇到的問題是即使我輸入重復的答案，驗證也是成功的。 我仍然可以繼續下一個對話框（如果輸入重復項，我希望驗證失敗）。 我認為這是因為我的自定義屬性沒有被觸發或被擊中，因為我添加了斷點但沒有被擊中。

在我的控制器中，我有if(ModelState.IsValid) { //continue to next dialog}並且模型狀態確實返回有效。

2 個解決方案

解決方案1
 2 已采納  2015-07-07 18:15:23

您可以創建一個自定義驗證屬性，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;
    }
}

這是一個測試用例： 

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);
    }
}

編輯：

我創建了一個默認的MVC項目並添加了您當前的代碼。 驗證工作得很好。

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視圖如下所示： 

@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")
}

如果我運行應用程序，如果我輸入兩個相同的答案，則ModelState.IsValid（）為false。 在驗證例程中設置斷點表明它正在運行。

解決方案2
 1  2015-07-07 18:07:57

您可以在模型中實現IValidatableObject接口，如下所示，並使用jQuery來處理客戶端的驗證。 

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...");
        }
    }
}

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