使用DataAnnotations来比较两个模特属性 [英] Using DataAnnotations to compare two model properties

问题描述

我将如何去写一个比较两个字段的自定义ValidationAttribute？这是常见的输入密码，确认密码的情景。我要肯定这两个领域都是平等的，并保持一致性，我想实现通过DataAnnotations验证。

How would I go about writing a custom ValidationAttribute that compares two fields? This is the common "enter password", "confirm password" scenario. I need to be sure the two fields are equal and to keep things consistent, I want to implement the validation via DataAnnotations.

因此​​，在伪code，我正在寻找一种方式来实现类似以下内容：

So in pseudo-code, I'm looking for a way to implement something like the following:

public class SignUpModel
{
    [Required]
    [Display(Name = "Password")]
    public string Password { get; set; }

    [Required]
    [Display(Name = "Re-type Password")]
    [Compare(CompareField = Password, ErrorMessage = "Passwords do not match")]
    public string PasswordConfirm { get; set; }
}

public class CompareAttribute : ValidationAttribute
{
    public CompareAttribute(object propertyToCompare)
    {
        // ??
    }

    public override bool IsValid(object value)
    {
        // ??
    }
}

所以，问题是，我怎么code中的[比较] ValidationAttribute？

So the question is, how do I code the [Compare] ValidationAttribute?

推荐答案

有一个CompareAttribute在ASP.NET MVC 3框架，做到这一点。如果你正在使用ASP.NET MVC 2和定位.NET 4.0，那么你可以看一下在ASP.NET MVC 3源$ C ​​$ c中的执行情况。

There is a CompareAttribute in the ASP.NET MVC 3 Framework that does this. If you are using ASP.NET MVC 2 and targeting .Net 4.0 then you could look at the implementation in the ASP.NET MVC 3 source code.

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