Question

我在我的模式中有这个：

[Required(AllowEmptyStrings = false, ErrorMessageResourceType = typeof(Registration), ErrorMessageResourceName = "NameRequired")]
[MinLength(3, ErrorMessageResourceType = typeof(Registration), ErrorMessageResourceName = "NameTooShort")]
public String Name { get; set; }

最终：

    <div class="editor-label">
        <label for="Name">Name</label>
    </div>
    <div class="editor-field">
        <input class="text-box single-line" data-val="true" data-val-required="Name is required" id="Name" name="Name" type="text" value="" />
        <span class="field-validation-valid" data-valmsg-for="Name" data-valmsg-replace="true"></span>
    </div>

编译器如何忽略MinLength？我怎样才能“开启”？

Answer 1

而不是使用MinLength属性而是使用它：

[StringLength(100, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 6)]

String Length MSDN

优点：无需编写自定义属性

Answer 2

而不是经历创建自定义属性的麻烦......为什么不使用正则表达式？

// Minimum of 3 characters, unlimited maximum
[RegularExpression(@"^.{3,}$", ErrorMessage = "Not long enough!")]

// No minimum, maximum of 42 characters
[RegularExpression(@"^.{,42}$", ErrorMessage = "Too long!")]

// Minimum of 13 characters, maximum of 37 characters
[RegularExpression(@"^.{13,37}$", ErrorMessage = "Needs to be 13 to 37 characters yo!")]

Answer 3

最新版本的ASP.Net MVC现在支持MinLength和MaxLength属性。请参阅官方asp.net mvc页面：Unobtrusive validation for MinLengthAttribute and MaxLengthAttribute

Answer 4

检查question。阅读评论似乎minlength和maxlenght都不起作用。因此他们建议对maxlenght使用StringLength属性。我猜你应该为min legth写一个自定义属性

对于自定义属性，您可以执行类似这样的操作

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
public class MyMinLengthAttribute : ValidationAttribute
{
  public int MinValue { get; set; }  

  public override bool IsValid(object value)
  {
    return value != null && value is string && ((string)value).Length >= MinValue;
  }
}

希望有所帮助

MVC3 jquery验证MinLength过滤器无法正常工作

4 个答案: