动态范围验证在ASP.NET MVC 2 [英] Dynamic Range Validation in ASP.NET MVC 2

问题描述

我使用ASP.NET MVC2，并尝试使用该属性在System.ComponentModel.DataAnnotations命名空间我的视图模型来验证。

I am using ASP.NET MVC2 and trying to validate my view models using the attributes in System.ComponentModel.DataAnnotations namespace.

我如何动态地设置RangeAttribute所允许的有效范围？
例如，如果我想验证输入的日期是可预期的范围内。

How can I dynamically set the permitted valid range of a RangeAttribute? For example, if I want to validate that a date entered is within an expected range.

这不会编译：

[Range(typeof(DateTime), 
        DateTime.Today.ToShortDateString(), 
        DateTime.Today.AddYears(1).ToShortDateString())]
    public DateTime DeliveryDate { get; set; }

由于属性参数必须是常量前pression，属性参数类型的typeof前pression或数组创建前pression。

because "an attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type".

我是否需要借助于创建自己的自定义验证？

Do I need to resort to creating my own custom validator?

推荐答案

OK，找到了答案。 .NET框架4提供了一个新的CustomValidationAttribute这使得以下可能：

OK, found the answer. .NET Framework 4 provides a new CustomValidationAttribute which makes the following possible:

[Required]
[DisplayName("Ideal Delivery Date")]
[CustomValidation(typeof(HeaderViewModel), "ValidateDeliveryDate")]
public DateTime DeliveryDate { get; set; }

public static ValidationResult ValidateDeliveryDate(DateTime deliveryDateToValidate)
{
    if (deliveryDateToValidate.Date < DateTime.Today)
    {
    return new ValidationResult("Delivery Date cannot be in the past.");
    }

    if (deliveryDateToValidate.Date > DateTime.Today.AddYears(1))
    {
    return new ValidationResult("Delivery Date must be within the next year.");
    }

    return ValidationResult.Success;
}

<一个href=\"http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.customvalidationattribute%28VS.100%29.aspx\">http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.customvalidationattribute%28VS.100%29.aspx

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