Статья
11/18/2011

RangeAttribute Class

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Designates the minimum and maximum constraints for the associated member.

Inheritance Hierarchy

System.Object
  System.Attribute
    System.ComponentModel.DataAnnotations.ValidationAttribute
      System.ComponentModel.DataAnnotations.RangeAttribute

Namespace: System.ComponentModel.DataAnnotations
Assembly: System.ComponentModel.DataAnnotations (in System.ComponentModel.DataAnnotations.dll)

Syntax

'Declaration
<AttributeUsageAttribute(AttributeTargets.Property Or AttributeTargets.Field Or AttributeTargets.Parameter, AllowMultiple := False)> _
Public Class RangeAttribute _
    Inherits ValidationAttribute

[AttributeUsageAttribute(AttributeTargets.Property|AttributeTargets.Field|AttributeTargets.Parameter, AllowMultiple = false)]
public class RangeAttribute : ValidationAttribute

The RangeAttribute type exposes the following members.

Constructors

	Name	Description
	RangeAttribute(Double, Double)	Initializes a new instance of the RangeAttribute class with specified double values as the minimum and maximum limits.
	RangeAttribute(Int32, Int32)	Initializes a new instance of the RangeAttribute class with specified integer values as the minimum and maximum limits.
	RangeAttribute(Type, String, String)	Initializes a new instance of the RangeAttribute class with the specified minimum and maximum values converted to the specified type.

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Properties

	Name	Description
	ErrorMessage	Gets or sets the non-localizable error message to display when validation fails. (Inherited from ValidationAttribute.)
	ErrorMessageResourceName	Gets or sets the property name on the resource type that provides the localizable error message. (Inherited from ValidationAttribute.)
	ErrorMessageResourceType	Gets or sets the resource type that provides the localizable error message. (Inherited from ValidationAttribute.)
	ErrorMessageString	Gets the localized or non-localized error message. (Inherited from ValidationAttribute.)
	Maximum	Gets the maximum allowed value for the range.
	Minimum	Gets the minimum allowed value for the range.
	OperandType	Gets the type of the Minimum and Maximum values.

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Methods

	Name	Description
	Equals	Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	FormatErrorMessage	Applies formatting to an error message based on the data field where the error occurred. (Overrides ValidationAttribute.FormatErrorMessage(String).)
	GetHashCode	Returns the hash code for this instance. (Inherited from Attribute.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetValidationResult	Determines whether the specified object is valid and returns an object that includes the results of the validation check. (Inherited from ValidationAttribute.)
	IsValid	Determines whether the specified object is valid. (Inherited from ValidationAttribute.)
	Match	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)
	Validate	Determines whether the specified object is valid and throws a ValidationException if the object is not valid. (Inherited from ValidationAttribute.)

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Remarks

You apply the RangeAttribute attribute to a property when you need to specify minimum and maximum values for the property. A validation exception is raised if the value of the property is not within the minimum and maximum values.

If the value of the property is nulla null reference (Nothing in Visual Basic) or an empty string (""), the value will not fail validation for the RangeAttribute attribute. To validate that the value is not nulla null reference (Nothing in Visual Basic) or an empty string, use the RequiredAttribute attribute.

The RangeAttribute class provides the RangeAttribute(Int32, Int32) constructor to specify integer values for the range, and the RangeAttribute(Double, Double) constructor to specify double values for the range. The RangeAttribute class provides the RangeAttribute(Type, String, String) constructor to specify range values that are not integer or double values by enabling you to provide the type for the minimum and maximum values. The type must implement the IComparable interface. For example, to validate a property against a range of decimal values you must provide the type of the Decimal structure and two string values that will be converted to decimal values.

Examples

The following example shows how to specify integer range values for one property and decimal range values for another property.

Public Class Product

  <Range(5, 50)> _
  Public Property ReorderLevel As Integer
    'Implement Get and Set logic
  End Property

  <Range(GetType(Decimal), "5", "5000")> _
  Public Property ListPrice As Decimal
    'Implement Get and Set logic
  End Property

End Class

public class Product
{

  [Range(5, 50)]
  public int ReorderLevel { get; set; }

  [Range(typeof(Decimal),"5", "5000")]
  public decimal ListPrice { get; set; }

}

Version Information

Silverlight

Supported in: 5, 4, 3

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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