CustomValidation 属性不适用于 ASP.NET MVC 3 和 EF

Question

我了解如何创建自定义验证属性。事实上，当我使用 Seed 方法预填充数据库时，Validate 方法正在执行，如果失败就会抛出异常。 但是，验证不适用于实体的创建表单。

我是否必须对 HTML（Razor 表单）进行一些更改？

它只是让我添加验证失败的项目。

代码在这里：

namespace Data.Model
{
    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false)]
    sealed public class YearsValidationAttribute : ValidationAttribute
    {
        // Internal field to hold the min value.
        readonly int _years;

        public int Years
        {
            get { return _years; }
        }

        public YearsValidationAttribute(int years)
        {
            _years = years;
        }


        public override bool IsValid(object value)
        {
            var years = (int)value;
            bool result = true;
            if (this.Years != null)
            {
                result = Years >= years;
            }
            return result;
        }



        public override string FormatErrorMessage(string name)
        {
            return String.Format(CultureInfo.CurrentCulture,
              ErrorMessageString, name, Years);
        }
    }
}


public class Position
    {
        [DatabaseGenerated(System.ComponentModel.DataAnnotations.DatabaseGeneratedOption.Identity)]   
        public int PositionID { get; set; }

        [Required(ErrorMessage = "Position name is required.")]
        [StringLength(20, MinimumLength = 3, ErrorMessage = "Name should not be longer than 20 characters.")]
        [Display(Name = "Position name")]              
        public string name { get; set; }

        [Required(ErrorMessage = "Number of years is required")] 
        [Display(Name = "Number of years")]
        [YearsValidationAttribute(5, ErrorMessage = "{0} value must be greater than {1} years.")]        
        public int yearsExperienceRequired { get; set; }

        public virtual ICollection<ApplicantPosition> applicantPosition { get; set; }
    }



@using (Html.BeginForm()) {
    @Html.ValidationSummary(true)
    <fieldset>
        <legend>Position</legend>

        @Html.HiddenFor(model => model.PositionID)

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

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

        <p>
            <input type="submit" value="Save" />
        </p>
    </fieldset>
}

Answer 1

您拥有的代码不会为您提供客户端验证器，而只会为您提供服务器端。但这是一个很好的起点。您需要在服务器上的操作方法中执行的操作是检查模型是否有效，如下所示：

public ActionResult YourAction(YourModel model)
{
    if(ModelState.IsValid)
    {
        // Do your save
    }
    else
    {
        // Do your other stuff
    }
}

如果您还需要客户端验证，则可以使用此处的资源：http://bradwilson.typepad.com/blog/2010/10/mvc3-unobtrusive-validation.html

您还可以尝试使用Remote验证属性：http://msdn.microsoft.com/en-us/library/gg508808(v=vs.98).aspx