Asp.Net MVC3模型验证字符串为null,如果不是,则最小长度为x [英] Asp.Net MVC3 Model Validation string is null or if not, has min length of x
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问题描述
很好奇,是否可以让模型验证执行以下操作:
Just curious, is it possible to have Model Validation do the following:
NewPassword可以为null 或者 如果NewPassword不为null,则最小长度为7
NewPassword can be null OR If NewPassword is not null, then have a min length of 7
推荐答案
使用现成的功能,我认为这是不可能的.
Using the out of the box functionality, I don't believe this is possible.
但是,当然可以通过创建自己的自定义ValidationAttribute
:
However, it is certainly possible by creating your own custom ValidationAttribute
:
public class MinLengthOrNullAttribute : ValidationAttribute
{
public int MinLength { get; set; }
public MinLengthOrNullAttribute(int minLength)
{
MinLength = minLength;
}
public override Boolean IsValid(Object value)
{
return value == null || (value as string).Length > minLength;
}
}
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