MVC验证低于/高于其他值

Question

如何在MVC.Net中验证模型的最佳方法,我希望接受最小/最大值.

不是字段的单个最小值/最大值.但是单独的字段供用户指定最小值/最大值.

public class FinanceModel{
   public int MinimumCost {get;set;}
   public int MaximumCost {get;set;}
}

所以我需要确保MinimumCost始终小于最大成本.

Answer 1

有一个名为Foolproof的NuGet包,它为您提供这些注释.也就是说 - 编写自定义属性既简单又好.

使用Foolproof看起来像:

public class FinanceModel{
   public int MinimumCost {get;set;}

   [GreaterThan("MinimumCost")]
   public int MaximumCost {get;set;}
}

Answer 2

您可以使用自定义验证属性,这是我的日期示例.但你也可以使用它.

首先,这是模型:

public DateTime Beggining { get; set; }

    [IsDateAfterAttribute("Beggining", true, ErrorMessageResourceType = typeof(LocalizationHelper), ErrorMessageResourceName = "PeriodErrorMessage")]
    public DateTime End { get; set; }

这是属性本身:

public sealed class IsDateAfterAttribute : ValidationAttribute, IClientValidatable
{
    private readonly string testedPropertyName;
    private readonly bool allowEqualDates;

    public IsDateAfterAttribute(string testedPropertyName, bool allowEqualDates = false)
    {
        this.testedPropertyName = testedPropertyName;
        this.allowEqualDates = allowEqualDates;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        var propertyTestedInfo = validationContext.ObjectType.GetProperty(this.testedPropertyName);
        if (propertyTestedInfo == null)
        {
            return new ValidationResult(string.Format("unknown property {0}", this.testedPropertyName));
        }

        var propertyTestedValue = propertyTestedInfo.GetValue(validationContext.ObjectInstance, null);

        if (value == null || !(value is DateTime))
        {
            return ValidationResult.Success;
        }

        if (propertyTestedValue == null || !(propertyTestedValue is DateTime))
        {
            return ValidationResult.Success;
        }

        // Compare values
        if ((DateTime)value >= (DateTime)propertyTestedValue)
        {
            if (this.allowEqualDates && value == propertyTestedValue)
            {
                return ValidationResult.Success;
            }
            else if ((DateTime)value > (DateTime)propertyTestedValue)
            {
                return ValidationResult.Success;
            }
        }

        return new ValidationResult(FormatErrorMessage(validationContext.DisplayName));
    }

    public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
    {
        var rule = new ModelClientValidationRule
        {
            ErrorMessage = this.ErrorMessageString,
            ValidationType = "isdateafter"
        };
        rule.ValidationParameters["propertytested"] = this.testedPropertyName;
        rule.ValidationParameters["allowequaldates"] = this.allowEqualDates;
        yield return rule;
    }

Answer 3

对于使用allowEqualDates和propertyTested参数的客户端验证(补充上面的Boranas答案,但评论太长):

// definition for the isdateafter validation rule
if ($.validator && $.validator.unobtrusive) {
    $.validator.addMethod('isdateafter', function (value, element, params) {
        value = Date.parse(value);
        var otherDate = Date.parse($(params.compareTo).val());
        if (isNaN(value) || isNaN(otherDate))
            return true;
        return value > otherDate || (value == otherDate && params.allowEqualDates);
    });
    $.validator.unobtrusive.adapters.add('isdateafter', ['propertytested', 'allowequaldates'], function (options) {
        options.rules['isdateafter'] = {
            'allowEqualDates': options.params['allowequaldates'],
            'compareTo': '#' + options.params['propertytested']
        };
        options.messages['isdateafter'] = options.message;
    });
}

更多信息:不显眼的验证,jquery验证