用于检查模型属性之间是否重复的自定义验证属性未触发
本文关键字：属性 验证 自定义 模型 检查 之间 是否 用于 | 更新日期: 2023-09-27 18:01:22
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键入相同的答案，我希望在他们键入重复答案时显示错误。
这是我的模型:
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; }
}
下面是我自定义属性的尝试:
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验证是成功的，即使我输入了重复的答案。我仍然可以继续下一个对话框(我预计验证失败，如果输入重复)。我认为这是因为我的自定义属性没有被触发或击中，因为我添加了断点，但没有击中。
在我的控制器中，我有if(ModelState.IsValid) { //continue to next dialog}，模型状态返回有效。
您可以创建这样一个自定义验证属性:
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;
}
}
，下面是一个测试用例:
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);
}
}
我创建了一个默认的MVC项目并添加了您当前的代码。
我将这个添加到home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();
}
}
和AskQuestions视图看起来像这样:
@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，ModelState.IsValid()是假的，如果我输入两个相同的答案。在验证例程中设置一个断点表明它正在运行。
你可以像下面这样在你的模型中实现IValidatableObject接口，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...");
}
}
}