如何驗證客戶端驗證中的雙變量規則？

Question

我有以下POCO：

public class CabinetItem 
{ 
    [Required] 
    [Display(...)] 
    public double Width { get; set; } 

    public double MinWidth { get; } 
} 

我試圖搞清楚的是我如何驗證Width比MinWidth較大時MinWidth可能是什麼嗎？最小寬度是一個依賴於櫥櫃項目的約束。注意：我還遺漏了一個MaxWidth來簡化這個問題。

Answer 1

您可以創建一個CustomValidationAttribute

以此爲考試PLE：

public class GreaterThanAttribute : ValidationAttribute, IClientValidatable 
    { 
     private readonly string _testedPropertyName; 
     private readonly bool _allowEqualValues; 
     private readonly string _testedPropertyDisplayName; 

     public override string FormatErrorMessage(string displayName) 
     { 
      return string.Format(ErrorMessages.GreaterThan_Message, displayName, _testedPropertyDisplayName); 
     } 

     public GreaterThanAttribute(string testedPropertyName, Type resourceType, string testedPropertyDisplayNameKey, bool allowEqualValues = false) 
     { 
      _testedPropertyName = testedPropertyName; 
      _allowEqualValues = allowEqualValues; 
      var rm = new ResourceManager(resourceType); 
      _testedPropertyDisplayName = rm.GetString(testedPropertyDisplayNameKey);    
     } 

     protected override ValidationResult IsValid(object value, ValidationContext validationContext) 
     { 
      var propertyTestedInfo = validationContext.ObjectType.GetProperty(_testedPropertyName); 

      if (propertyTestedInfo == null) 
      { 
       return new ValidationResult(string.Format("unknown property {0}", _testedPropertyName)); 
      } 

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

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

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

      // Compare values 
      if ((Decimal)value >= (Decimal)propertyTestedValue) 
      { 
       if (_allowEqualValues && value == propertyTestedValue) 
       { 
        return ValidationResult.Success; 
       } 
       else if ((Decimal)value > (Decimal)propertyTestedValue) 
       { 
        return ValidationResult.Success; 
       } 
      } 

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

     public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context) 
     { 
      var rule = new ModelClientValidationRule 
      { 
       ErrorMessage = FormatErrorMessage(metadata.DisplayName), 
       ValidationType = "greaterthan" 
      }; 
      rule.ValidationParameters["propertytested"] = _testedPropertyName; 
      rule.ValidationParameters["allowequalvalues"] = _allowEqualValues; 
      yield return rule; 
     } 
    } 

您可以使用它像這樣：

public Decimal MyProperty1 { get; set; } 

[GreaterThanAttribute("MyProperty1", typeof(Strings), "Error_String")] 
public Decimal MyProperty2 { get; set; } 

[GreaterThanAttribute("MyProperty2", typeof(Strings), "Error_String")] 
public Decimal MyProperty3 { get; set; } 

，以及在客戶端，您可以添加此客戶端驗證：

jQuery.validator.unobtrusive.adapters.add('greaterthan', ['propertytested', 'allowequalvalues'], function (options) { 
      options.params["allowequalvalues"] = options.params["allowequalvalues"] === "True" || 
               options.params["allowequalvalues"] === "true" || 
               options.params["allowequalvalues"] === true ? true : false; 

      options.rules['greaterthan'] = options.params; 
      options.messages['greaterthan'] = options.message; 
     }); 
jQuery.validator.addMethod("greaterthan", function (value, element, params) {   
      var properyTestedvalue= $('input[name="' + params.propertytested + '"]').val(); 
      if (!value || !properyTestedvalue) return true; 
      return (params.allowequalvalues) ? parseFloat(properyTestedvalue) <= parseFloat(value) : parseFloat(properyTestedvalue) < parseFloat(value); 
     }, ''); 

Answer 2

選項1：

foolproof NuGet包可能是你的情況是非常有用的。

安裝foolproof NuGet包，並使用其額外的有用的屬性如下所示：

public class CabinetItem 
{ 
    [Required] 
    [Display(...)] 
    [GreaterThan("MinWidth")] 
    public double Width { get; set; } 

    public double MinWidth { get; } 
} 

還有一些其他的功能，以及：

• [是]
• [EqualTo]
• [NotEqualTo]
• [GreaterThan]
• [每種不超過]
• [GreaterThanOrEqualTo]
• [LessThanOrEqualTo]

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資源：Is there a way through data annotations to verify that one date property is greater than or equal to another date property?