相关疑难解决方法(0)

我正在尝试使用客户端验证来实现自定义验证属性.

我的属性如下:

public class FileSize : ValidationAttribute, IClientValidatable
{
    private readonly int _size;

    public FileSize(int size)
    {
        ErrorMessage = "Invalid size.";
        _size = size;
    }

    public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
    {
        var rule = new ModelClientValidationRule
        {
            ValidationType = "fileSize",
            ErrorMessage = ErrorMessage
        };

        rule.ValidationParameters["size"] = _size;

        yield return rule;
    }

    public override bool IsValid(object value)
    {
        return ((HttpPostedFileBase) value).ContentLength < _size;
    }
}

并且脚本在我的视图中包含如下内容:

<script src="@Url.Content("~/Scripts/jquery-1.4.4.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.js")" type="text/javascript"></script>
<script type="text/javascript">
    $(function () { …

我创建了一个从ValidationAttribute派生的自定义验证器.我的undertsandng是它将为客户端脚本生成足够的元数据以自动验证(使用jquery.validate).自定义验证器在服务器端正常工作.但它不会在客户端激发错误消息.(其他默认验证器,如"StringLength"在客户端也正常工作.)我们如何纠正它？

public class Person
{
    [Required(ErrorMessage = "First name required")]
    public string FirstName { get; set; }

    [CustomStartLetterMatch("FirstName")]
    [StringLength(5,ErrorMessage = "Must be under 5 characters")]
    public string LastName { get; set; }

    [Range(18,50,ErrorMessage="Must be between 18 and 50")]
    public int Age { get; set; }


}


public sealed class CustomStartLetterMatch : ValidationAttribute
{

    private const string _defaultErrorMessage = " First letter of '{0}' must be same as first letetr of '{1}'";
    private string _basePropertyName;

    public CustomStartLetterMatch(string basePropertyName)
        : base(_defaultErrorMessage)
    { …