RangeAttribute 类

定义

为数据字段的值指定数值范围约束。Specifies the numeric range constraints for the value of a data field.

public ref class RangeAttribute : System::ComponentModel::DataAnnotations::ValidationAttribute
[System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter | System.AttributeTargets.Property, AllowMultiple=false)]
public class RangeAttribute : System.ComponentModel.DataAnnotations.ValidationAttribute
public class RangeAttribute : System.ComponentModel.DataAnnotations.ValidationAttribute
[System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Property, AllowMultiple=false)]
public class RangeAttribute : System.ComponentModel.DataAnnotations.ValidationAttribute
[<System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter | System.AttributeTargets.Property, AllowMultiple=false)>]
type RangeAttribute = class
    inherit ValidationAttribute
type RangeAttribute = class
    inherit ValidationAttribute
[<System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Property, AllowMultiple=false)>]
type RangeAttribute = class
    inherit ValidationAttribute
Public Class RangeAttribute
Inherits ValidationAttribute
继承
属性

示例

下面的示例演示如何使用 RangeAttribute 自定义数据字段的格式。The following example shows how to use the RangeAttribute to customize formatting for a data field. 该示例执行以下步骤:The example performs the following steps:

  • 实现元数据分部类和关联的元数据类。Implements a metadata partial class and the associated metadata class.

  • 在关联的元数据类中,它将应用 RangeAttribute 属性以获取以下结果:In the associated metadata class, it applies the RangeAttribute attribute to obtain the following results:

    • 将特性应用到整数类型的数据字段。Apply the attribute to a data field of type integer.

    • 将特性应用于整数数据字段并定义自定义验证错误消息。Apply the attribute to an integer data field and define a custom validation error message.

    • 将特性应用到 DateTime 数据字段,并定义自定义验证错误消息。Apply the attribute to a DateTime data field and define a custom validation error message.

using System;
using System.Web.DynamicData;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel;

[MetadataType(typeof(ProductMetaData))]
public partial class Product
{
}

public class ProductMetaData
{
    
    [Range(10, 1000, 
        ErrorMessage = "Value for {0} must be between {1} and {2}.")]
    public object Weight;

    [Range(300, 3000)]
    public object ListPrice;

    [Range(typeof(DateTime), "1/2/2004", "3/4/2004",
        ErrorMessage = "Value for {0} must be between {1} and {2}")]
    public object SellEndDate;
}
 
Imports System.Web.DynamicData
Imports System.ComponentModel.DataAnnotations
Imports System.ComponentModel

<MetadataType(GetType(ProductMetaData))> _
Partial Public Class Product

End Class


Public Class ProductMetaData
    
    <Range(10, 1000, _
           ErrorMessage:="Value for {0} must be between {1} and {2}.")> _
    Public Weight As Object

    <Range(300, 3000)> _
    Public ListPrice As Object

    <Range(GetType(DateTime), "1/2/2004", "3/4/2004", _
           ErrorMessage:="Value for {0} must be between {1} and {2}")> _
    Public SellEndDate As Object

End Class

若要编译该示例,需要以下各项:To compile the example, you need the following:

  • Microsoft Visual Studio 2008 Service Pack 1 或 Visual Web Developer 2008 速成版 SP1。Microsoft Visual Studio 2008 Service Pack 1 or Visual Web Developer 2008 Express Edition SP1.

  • 数据驱动的网站。A data-driven Web site. 这使您可以为数据库创建数据上下文,并创建包含要自定义的数据字段的类。This enables you to create a data context for the database and the class that contains the data field to customize. 有关详细信息,请参阅 Walkthrough: Creating a New Dynamic Data Web Site using ScaffoldingFor more information, see Walkthrough: Creating a New Dynamic Data Web Site using Scaffolding.

注解

将此特性应用于数据字段时,必须遵循有关如何使用验证特性的准则。When you apply this attribute to a data field, you must follow the guidelines for how to use validation attributes. 有关详细信息,请参阅 ASP.NET 动态数据准则For more information, see ASP.NET Dynamic Data Guidelines.

构造函数

RangeAttribute(Double, Double)

使用指定的最小值和最大值初始化 RangeAttribute 类的一个新实例。Initializes a new instance of the RangeAttribute class by using the specified minimum and maximum values.

RangeAttribute(Int32, Int32)

使用指定的最小值和最大值初始化 RangeAttribute 类的一个新实例。Initializes a new instance of the RangeAttribute class by using the specified minimum and maximum values.

RangeAttribute(Type, String, String)

使用指定的最小值和最大值以及特定类型初始化 RangeAttribute 类的一个新实例。Initializes a new instance of the RangeAttribute class by using the specified minimum and maximum values and the specific type.

属性

ConvertValueInInvariantCulture

获取或设置一个值,该值确定将要验证的值转换为由 RangeAttribute(Type, String, String) 构造函数的 type 参数设置的 OperandType 是使用固定区域性还是当前区域性。Gets or sets a value that determines whether any conversions of the value being validated to OperandType as set by the type parameter of the RangeAttribute(Type, String, String) constructor use the invariant culture or the current culture.

ErrorMessage

获取或设置一条在验证失败的情况下与验证控件关联的错误消息。Gets or sets an error message to associate with a validation control if validation fails.

(继承自 ValidationAttribute)
ErrorMessageResourceName

获取或设置错误消息资源的名称,在验证失败的情况下,要使用该名称来查找 ErrorMessageResourceType 属性值。Gets or sets the error message resource name to use in order to look up the ErrorMessageResourceType property value if validation fails.

(继承自 ValidationAttribute)
ErrorMessageResourceType

获取或设置在验证失败的情况下用于查找错误消息的资源类型。Gets or sets the resource type to use for error-message lookup if validation fails.

(继承自 ValidationAttribute)
ErrorMessageString

获取本地化的验证错误消息。Gets the localized validation error message.

(继承自 ValidationAttribute)
Maximum

获取所允许的最大字段值。Gets the maximum allowed field value.

Minimum

获取所允许的最小字段值。Gets the minimum allowed field value.

OperandType

获取必须验证其值的数据字段的类型。Gets the type of the data field whose value must be validated.

ParseLimitsInInvariantCulture

获取或设置一个值,该值确定 MinimumMaximum 的字符串值是否是使用固定区域性而非当前区域性分析的。Gets or sets a value that determines whether string values for Minimum and Maximum are parsed using the invariant culture rather than the current culture.

RequiresValidationContext

获取指示特性是否要求验证上下文的值。Gets a value that indicates whether the attribute requires validation context.

(继承自 ValidationAttribute)
TypeId

在派生类中实现时,获取此 Attribute 的唯一标识符。When implemented in a derived class, gets a unique identifier for this Attribute.

(继承自 Attribute)

方法

Equals(Object)

返回一个值,该值指示此实例是否与指定的对象相等。Returns a value that indicates whether this instance is equal to a specified object.

(继承自 Attribute)
FormatErrorMessage(String)

对范围验证失败时显示的错误消息进行格式设置。Formats the error message that is displayed when range validation fails.

GetHashCode()

返回此实例的哈希代码。Returns the hash code for this instance.

(继承自 Attribute)
GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
GetValidationResult(Object, ValidationContext)

检查指定的值对于当前的验证特性是否有效。Checks whether the specified value is valid with respect to the current validation attribute.

(继承自 ValidationAttribute)
IsDefaultAttribute()

在派生类中重写时,指示此实例的值是否是派生类的默认值。When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.

(继承自 Attribute)
IsValid(Object)

检查数据字段的值是否在指定的范围中。Checks that the value of the data field is in the specified range.

IsValid(Object, ValidationContext)

根据当前的验证特性来验证指定的值。Validates the specified value with respect to the current validation attribute.

(继承自 ValidationAttribute)
Match(Object)

当在派生类中重写时,返回一个指示此实例是否等于指定对象的值。When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.

(继承自 Attribute)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
ToString()

返回表示当前对象的字符串。Returns a string that represents the current object.

(继承自 Object)
Validate(Object, String)

验证指定的对象。Validates the specified object.

(继承自 ValidationAttribute)
Validate(Object, ValidationContext)

验证指定的对象。Validates the specified object.

(继承自 ValidationAttribute)

显式接口实现

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

将一组名称映射为对应的一组调度标识符。Maps a set of names to a corresponding set of dispatch identifiers.

(继承自 Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

检索对象的类型信息,然后可以使用该信息获取接口的类型信息。Retrieves the type information for an object, which can be used to get the type information for an interface.

(继承自 Attribute)
_Attribute.GetTypeInfoCount(UInt32)

检索对象提供的类型信息接口的数量(0 或 1)。Retrieves the number of type information interfaces that an object provides (either 0 or 1).

(继承自 Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

提供对某一对象公开的属性和方法的访问。Provides access to properties and methods exposed by an object.

(继承自 Attribute)

适用于