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/最大值。但是单独的字段供用户指定最小/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实用。

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。但是你也可以使用它。

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

使用allowEqualDates和propertyTested参数进行客户端验证（补充Boranas上面的答案，但评论时间太长）：

// 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：unobtrusive validation，jquery validation

Answer 4

在VB中用于整数：

<强> MODEL

<UtilController.IsIntegerGreatherOrEqualThan("PropertyNameNumberBegins", "PeriodErrorMessage")>
        Public Property PropertyNameNumberEnds As Nullable(Of Integer)

有效

Public Class IsIntegerGreatherOrEqualThan
        Inherits ValidationAttribute

        Private otherPropertyName As String
        Private errorMessage As String

        Public Sub New(ByVal otherPropertyName As String, ByVal errorMessage As String)
            Me.otherPropertyName = otherPropertyName
            Me.errorMessage = errorMessage
        End Sub

        Protected Overrides Function IsValid(thisPropertyValue As Object, validationContext As ValidationContext) As ValidationResult

            Dim otherPropertyTestedInfo = validationContext.ObjectType.GetProperty(Me.otherPropertyName)

            If (otherPropertyTestedInfo Is Nothing) Then
                Return New ValidationResult(String.Format("unknown property {0}", Me.otherPropertyName))
            End If

            Dim otherPropertyTestedValue = otherPropertyTestedInfo.GetValue(validationContext.ObjectInstance, Nothing)

            If (thisPropertyValue Is Nothing) Then
                Return ValidationResult.Success
            End If

            ''  Compare values
            If (CType(thisPropertyValue, Integer) >= CType(otherPropertyTestedValue, Integer)) Then
                Return ValidationResult.Success
            End If

            ''  Wrong
            Return New ValidationResult(errorMessage)
        End Function
    End Class

Answer 5

为什么不使用Range Validator。语法：

    [Range(typeof(int), "0", "100", ErrorMessage = "{0} can only be between {1} and {2}")]
    public int Percentage { get; set; }

MVC验证低于/高于其他值

5 个答案: