Question

Im using DataAnnotations in an interface of a linq sql class. Thats all fine.

与时段有关的问题

我的法典如下:

 [DataType(DataType.Date)]
    [RegularExpression(@"^([1-9]|0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)dd$", ErrorMessage = "regexFail")]
    DateTime? DateofBirth { get; set; }

Now the datatype expression works fine, it brings in a date rather than a date time. The problem lies in validation of the fields. My regex doesn t match dates, even though i put it into an engine and it does. For instance i put "10/10/2010" in the field and i get the error "regexFail".

我确信我的发言是好的,因此我不敢肯定什么错了。

Thanks in advance.

Answer 1

我认为,正在发生的情况是,<代码>Datetime值正在转换成一种扼杀,然后与模式相匹配。如果使用该词和<代码>ToString,那么在座标上将列入一个 12:00:00 AM的缺省时间。

我尝试了以下代码和IsValid回到true:

string pattern = @"^([1-9]|0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)dds12:00:00sAM$";

RegularExpressionAttribute attribute = new RegularExpressionAttribute(pattern) { ErrorMessage = "regexFail" };
DateTime dt = new DateTime(2010, 10, 10);

bool isValid = attribute.IsValid(dt);

Answer 2

Decorating a DateTime field with the [RegularExpression] attribute doesn t make any sense. This attribute is used with string types. When you have a DateTime property the default model binder will use the current culture setting to parse the request value into a DateTime assuming it was a POST request and it will use the yyyy-MM-dd format if it was a GET request. So as you can see it s the default model binder responsible for converting the user HTTP request into an instance of the DateTime field and the RegularExpression validator doesn t come into play.

因此,如果你想要将用户可以进入某些习惯格式的日期限制,你可以使用custom模型对日期。

在其他价值类别,如ger和两倍,则相同。

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