Artigo
11/18/2011

EnumDataTypeAttribute Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Specifies that an entity member corresponds to an enumeration type.

Inheritance Hierarchy

System.Object
  System.Attribute
    System.ComponentModel.DataAnnotations.ValidationAttribute
      System.ComponentModel.DataAnnotations.DataTypeAttribute
        System.ComponentModel.DataAnnotations.EnumDataTypeAttribute

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

Syntax

'Declaration
<AttributeUsageAttribute(AttributeTargets.Method Or AttributeTargets.Property Or AttributeTargets.Field Or AttributeTargets.Parameter, AllowMultiple := False)> _
Public NotInheritable Class EnumDataTypeAttribute _
    Inherits DataTypeAttribute

[AttributeUsageAttribute(AttributeTargets.Method|AttributeTargets.Property|AttributeTargets.Field|AttributeTargets.Parameter, AllowMultiple = false)]
public sealed class EnumDataTypeAttribute : DataTypeAttribute

The EnumDataTypeAttribute type exposes the following members.

Constructors

	Name	Description
	EnumDataTypeAttribute	Initializes a new instance of the EnumDataTypeAttribute class.

Top

Properties

	Name	Description
	CustomDataType	Gets a string that represents the name of the customized data type to associate with the member. (Inherited from DataTypeAttribute.)
	DataType	Gets the type of the data object to associate with the member. (Inherited from DataTypeAttribute.)
	DisplayFormat	Gets the object that represents the format of the data type. (Inherited from DataTypeAttribute.)
	EnumType	Gets the enumeration type associated with the entity member.
	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.)

Top

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 the error message. (Inherited from ValidationAttribute.)
	GetDataTypeName	Retrieves the name of the data type that is associated with the member. (Inherited from DataTypeAttribute.)
	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.)

Top

Remarks

You apply the EnumDataTypeAttribute attribute to a property when the property represents an enumeration type that is not available in the data source. For example, you may store a value as an integer in your database, but you want to associate that integer to an enumeration value in your application. When you apply the EnumDataTypeAttribute attribute to a property, you provide the type of the enumeration you want to associate with the property.

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 EnumDataTypeAttribute attribute. To validate that the value is not nulla null reference (Nothing in Visual Basic) or an empty string, use the RequiredAttribute attribute.

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.

Partilhar via