Question

假设我有一个StartDate和一个EndDate，我想检查EndDate是否距离开始日期不超过3个月

public class DateCompare : ValidationAttribute 
 {
    public String StartDate { get; set; }
    public String EndDate { get; set; }

    //Constructor to take in the property names that are supposed to be checked
    public DateCompare(String startDate, String endDate)
    {
        StartDate = startDate;
        EndDate = endDate;
    }

    public override bool IsValid(object value)
    {
        var str = value.ToString();
        if (string.IsNullOrEmpty(str))
            return true;

        DateTime theEndDate = DateTime.ParseExact(EndDate, "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture);
        DateTime theStartDate = DateTime.ParseExact(StartDate, "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture).AddMonths(3);
        return (DateTime.Compare(theStartDate, theEndDate) > 0);
    }
}

我想将此实现到我的验证中

[DateCompare（“StartDate”，“EndDate”，ErrorMessage =“交易只能是3个月！”）

我知道我在这里收到错误...但是如何在asp.net mvc中进行这种业务规则验证

Answer 1

这是一个迟到的答案，但我想分享给其他人。以下是我如何使用不显眼的客户端验证来验证所有内容：

创建属性类：

public class DateCompareValidationAttribute : ValidationAttribute, IClientValidatable
{

  public enum CompareType
  {
      GreatherThen,
      GreatherThenOrEqualTo,
      EqualTo,
      LessThenOrEqualTo,
      LessThen
  }




  private CompareType _compareType;
  private DateTime _fromDate;
  private DateTime _toDate;

  private string _propertyNameToCompare;

  public DateCompareValidationAttribute(CompareType compareType, string message, string compareWith = "")
{
    _compareType = compareType;
    _propertyNameToCompare = compareWith;
    ErrorMessage = message;
}


#region IClientValidatable Members
/// <summary>
/// Generates client validation rules
/// </summary>
public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
{
    ValidateAndGetCompareToProperty(metadata.ContainerType);
    var rule = new ModelClientValidationRule();

    rule.ErrorMessage = ErrorMessage;
    rule.ValidationParameters.Add("comparetodate", _propertyNameToCompare);
    rule.ValidationParameters.Add("comparetype", _compareType);
    rule.ValidationType = "compare";

    yield return rule;
}

#endregion


 protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
     // Have to override IsValid method. If you have any logic for server site validation, put it here. 
    return ValidationResult.Success;

}

/// <summary>
/// verifies that the compare-to property exists and of the right types and returnes this property
/// </summary>
/// <param name="containerType">Type of the container object</param>
/// <returns></returns>
private PropertyInfo ValidateAndGetCompareToProperty(Type containerType)
{
    var compareToProperty = containerType.GetProperty(_propertyNameToCompare);
    if (compareToProperty == null)
    {
        string msg = string.Format("Invalid design time usage of {0}. Property {1} is not found in the {2}", this.GetType().FullName, _propertyNameToCompare, containerType.FullName);
        throw new ArgumentException(msg);
    }
    if (compareToProperty.PropertyType != typeof(DateTime) && compareToProperty.PropertyType != typeof(DateTime?))
    {
        string msg = string.Format("Invalid design time usage of {0}. The type of property {1} of the {2} is not DateType", this.GetType().FullName, _propertyNameToCompare, containerType.FullName);
        throw new ArgumentException(msg);
    }

    return compareToProperty;
}
}

注意：如果要验证时间长度，请向约束器添加另一个参数，并更改此特定类型的比较的枚举器

将属性添加到字段中，如下所示：
[DateCompareValidation(DateCompareValidationAttribute.CompareType.GreatherThenOrEqualTo, "This Date must be on or after another date", compareWith: "AnotherDate")]
记下您生成的html是如何更改的。它应包括验证消息，比较日期的字段名称等。生成的parms将以“data-val-compare”开头。在GetClientValidationRules方法中设置ValidationType =“compare”时，您定义了此“比较”。
现在您需要匹配javascript代码：添加验证适配器和验证方法。我在这里使用了无数方法，但你不必这样做。我建议将此代码放在一个单独的javascript文件中，以便此文件与您的属性类一起变得像一个控件，可以在任何地方使用。

$。validator.unobtrusive.adapters.add（ '相比'， ['comparetodate'，'comparetype']， function（options）{ options.rules ['compare'] = options.params; options.messages ['compare'] = options.message; } ）;

$.validator.addMethod("compare", function (value, element, parameters) {
    // value is the actuall value entered 
    // element is the field itself, that contain the the value (in case the value is not enough)

    var errMsg = "";
    // validate parameters to make sure everyting the usage is right
    if (parameters.comparetodate == undefined) {
        errMsg = "Compare validation cannot be executed: comparetodate parameter not found";
        alert(errMsg);
        return false;
    }
    if (parameters.comparetype == undefined) {
        errMsg = "Compare validation cannot be executed: comparetype parameter not found";
        alert(errMsg);
        return false;
    }


    var compareToDateElement = $('#' + parameters.comparetodate).get();
    if (compareToDateElement.length == 0) {
        errMsg = "Compare validation cannot be executed: Element to compare " + parameters.comparetodate + " not found";
        alert(errMsg);
        return false;
    }
    if (compareToDateElement.length > 1) {
        errMsg = "Compare validation cannot be executed: more then one Element to compare with id " + parameters.comparetodate + " found";
        alert(errMsg);
        return false;
    }
    //debugger;

    if (value && !isNaN(Date.parse(value))) {
        //validate only the value contains a valid date. For invalid dates and blanks non-custom validation should be used    
        //get date to compare
        var compareToDateValue = $('#' + parameters.comparetodate).val();
        if (compareToDateValue && !isNaN(Date.parse(compareToDateValue))) {
            //if date to compare is not a valid date, don't validate this
            switch (parameters.comparetype) {
                case 'GreatherThen':
                    return new Date(value) > new Date(compareToDateValue);
                case 'GreatherThenOrEqualTo':
                    return new Date(value) >= new Date(compareToDateValue);
                case 'EqualTo':
                    return new Date(value) == new Date(compareToDateValue);
                case 'LessThenOrEqualTo':
                    return new Date(value) <= new Date(compareToDateValue);
                case 'LessThen':
                    return new Date(value) < new Date(compareToDateValue);
                default:
                    {
                        errMsg = "Compare validation cannot be executed: '" + parameters.comparetype + "' is invalid for comparetype parameter";
                        alert(errMsg);
                        return false;
                    }
            }
            return true;
        }
        else
            return true;

    }
    else
        return true;
});

这只关注客户端不显眼的验证。如果你需要服务器端，你必须在isValid方法的覆盖中有一些逻辑。此外，您可以使用Reflection使用显示属性等生成错误消息，并使消息参数可选。

Answer 2

我只想知道如何在班级而不是在属性级别这样做。如果您创建MVC应用程序，则帐户模型将显示下面所示的方法。

<强>类别：

  [PropertiesMustMatch("Password",
            "ConfirmPassword", ErrorMessage =
            "Password and confirmation password
            do not match.")]
                public class RegisterModel
                {

                    [Required(ErrorMessage = "Required")]
                    [DataType(DataType.EmailAddress)]
                    [DisplayName("Your Email")]
                    public string Email { get; set; }              

                    [Required(ErrorMessage = "Required")]
                    [ValidatePasswordLength]
                    [DataType(DataType.Password)]
                    [DisplayName("Password")]
                    public string Password { get; set; }

                    [Required(ErrorMessage = "Required")]
                    [DataType(DataType.Password)]
                    [DisplayName("Re-enter password")]
                    public string ConfirmPassword { get; set; }                
                }

验证方法：

[AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = true)]
    public sealed class PropertiesMustMatchAttribute : ValidationAttribute
    {
        private const string _defaultErrorMessage = "'{0}' and '{1}' do not match.";

        private readonly object _typeId = new object();

        public PropertiesMustMatchAttribute(string originalProperty, string confirmProperty)
            : base(_defaultErrorMessage)
        {
            OriginalProperty = originalProperty;
            ConfirmProperty = confirmProperty;
        }

        public string ConfirmProperty
        {
            get;
            private set;
        }

        public string OriginalProperty
        {
            get;
            private set;
        }

        public override object TypeId
        {
            get
            {
                return _typeId;
            }
        }

        public override string FormatErrorMessage(string name)
        {
            return String.Format(CultureInfo.CurrentUICulture, ErrorMessageString,
                OriginalProperty, ConfirmProperty);
        }

        public override bool IsValid(object value)
        {
            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(value);
            object originalValue = properties.Find(OriginalProperty, true /* ignoreCase */).GetValue(value);
            object confirmValue = properties.Find(ConfirmProperty, true /* ignoreCase */).GetValue(value);
            return Object.Equals(originalValue, confirmValue);
        }
}

Answer 3

日期

实体：

[MetadataType(typeof(MyEntity_Validation))]
public partial class MyEntity
{
}
public class MyEntity_Validation
{
    [Required(ErrorMessage="'Date from' is required")]
    public DateTime DateFrom { get; set; }

    [CompareDatesValidatorAttribute("DateFrom")]  
    public DateTime DateTo { get; set; }
}

属性：

 public sealed class CompareDatesValidatorAttribute : ValidationAttribute
{
    private string _dateToCompare;  
    private const string _errorMessage = "'{0}' must be greater or equal'{1}'";  

    public CompareDatesValidatorAttribute(string dateToCompare)
        : base(_errorMessage)
    {
        _dateToCompare = dateToCompare;
    }

    public override string FormatErrorMessage(string name)
    {
        return string.Format(_errorMessage, name, _dateToCompare);
    } 

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        var dateToCompare = validationContext.ObjectType.GetProperty(_dateToCompare);
        var dateToCompareValue = dateToCompare.GetValue(validationContext.ObjectInstance, null);
        if (dateToCompareValue != null && value != null && (DateTime)value < (DateTime)dateToCompareValue) 
        {
            return new ValidationResult(FormatErrorMessage(validationContext.DisplayName));
        }
        return null;
    }
}

2。密码

实体：

   public string Password { get; set; }

    [Compare("Password", ErrorMessage = "ConfirmPassword must match Password")]
    public string ConfirmPassword { get; set; }

我希望它有所帮助

Answer 4

属性

public class CompareValidatorAttribute : ValidationAttribute, IInstanceValidationAttribute
{
    public CompareValidatorAttribute(string prefix, string propertyName) {
        Check.CheckNullArgument("propertyName", propertyName);

        this.propertyName = propertyName;
        this.prefix = prefix;
    }

    string propertyName, prefix;

    public string PropertyName
    {
        get { return propertyName; }
    }

    public string Prefix
    {
        get { return prefix; }
    }

    #region IInstanceValidationAttribute Members

    public bool IsValid(object instance, object value)
    {
        var property = instance.GetType().GetProperty(propertyName);

        var targetValue = property.GetValue(instance, null);
        if ((targetValue == null && value == null) || (targetValue != null && targetValue.Equals(value)))
            return true;

        return false;
    }

    #endregion

    public override bool IsValid(object value)
    {
        throw new NotImplementedException();
    }
}

界面

public interface IInstanceValidationAttribute
{
    bool IsValid(object instance, object value);
}

验证器

public class CompareValidator : DataAnnotationsModelValidator<CompareValidatorAttribute>
{
    public CompareValidator(ModelMetadata metadata, ControllerContext context, CompareValidatorAttribute attribute)
        : base(metadata, context, attribute)
    {
    }

    public override IEnumerable<ModelValidationResult> Validate(object container)
    {
        if (!(Attribute as IInstanceValidationAttribute).IsValid(container, Metadata.Model))
            yield return (new ModelValidationResult
            {
                MemberName = Metadata.PropertyName,
                Message = Attribute.ErrorMessage
            });
    }

    public override IEnumerable<ModelClientValidationRule> GetClientValidationRules()
    {
        var rule = new ModelClientValidationRule() { ErrorMessage = Attribute.ErrorMessage, ValidationType = "equalTo" };
        rule.ValidationParameters.Add("equalTo", "#" + (!string.IsNullOrEmpty(Attribute.Prefix) ? Attribute.Prefix + "_" : string.Empty)+ Attribute.PropertyName);

        return new[] { rule };
    }
}

注册：

DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(CompareValidatorAttribute), typeof(CompareValidator));

Answer 5

感谢您的信息。当我想将验证消息绑定到属性时，我不知所措。如果你换行

[AttributeUsage(AttributeTargets.Class)]

为...

[AttributeUsage(AttributeTargets.Property)]

您可以将比较移到特定属性之上。谢谢（你的）信息！由于我的客户端仍在3.5 sp1上运行，因此提供了很多帮助。 悲伤的脸

比较日期DataAnnotations验证asp.net mvc

5 个答案: