MVC验证低于/高于其他值

本文关键字：高于 其他 验证 MVC | 更新日期: 2023-09-27 18:30:06

How是在MVC.Net中验证模型的最佳方法，我希望在这里接受最小值/最大值。

不是字段的单个最小/最大值。但是为用户指定最小值/最大值的单独字段。

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

所以我需要确保最小成本总是小于最大成本。

MVC验证低于/高于其他值

有一个名为Foolproof的NuGet包，它为您提供了这些注释。也就是说，编写自定义属性既非常简单，又是一种很好的实践。

使用Foolproof看起来像：

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

您可以使用自定义验证属性，这里是我的日期示例。但是你也可以把它和int一起使用。

首先，这里是模型：

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

这就是属性本身：

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;
    }

对于使用allowEqualDates和propertyTested参数的客户端验证（对上述Boranas答案的补充，但太长，无法注释）：

// 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：不引人注目的验证，jquery验证

在VB中对于整数：

型号

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

验证

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

为什么不使用范围验证器。语法：

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