EnumMemberAttribute Classe

Definição

public ref class EnumMemberAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Field, AllowMultiple=false, Inherited=false)]
public sealed class EnumMemberAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Field, AllowMultiple=false, Inherited=false)>]
type EnumMemberAttribute = class
    inherit Attribute

Public NotInheritable Class EnumMemberAttribute
Inherits Attribute

Herança

Object

Attribute

EnumMemberAttribute

Atributos

AttributeUsageAttribute

Exemplos

O exemplo seguinte mostra EnumMemberAttribute aplicado a membros de uma enumeração.

[DataContract]
public enum Position
{
    [EnumMember(Value = "Emp")]
    Employee,
    [EnumMember(Value = "Mgr")]
    Manager,
    [EnumMember(Value = "Ctr")]
    Contractor,
    NotASerializableEnumeration
}

[DataContract]
public class Person : IExtensibleDataObject
{
    public Person(string firstNameValue, string lastNameValue)
    {
        LastName = firstNameValue;
        FirstName = lastNameValue;
    }

    private ExtensionDataObject extensioDataValue;
    public ExtensionDataObject ExtensionData
    {
        get { return extensioDataValue; }
        set { extensioDataValue = value; }
    }

    [DataMember]
    internal string FirstName;
    [DataMember]
    internal string LastName;
    [DataMember]
    internal Position Description;
}

public sealed class Test
{
    private Test() { }
    static void Main()
    {

        try
        {

            Test t = new Test();
            t.Serialize("Enum.xml");
            Console.WriteLine("Done");
            Console.ReadLine();
        }
        catch (SerializationException  exc)
        {
            Console.WriteLine(exc.Message);
            Console.ReadLine();
        }
    }

    private void Serialize(string path)
    {
        Console.WriteLine("Serializing...");
        Person p = new Person("Denise", "Smith");
        p.Description = Position.Manager;

        FileStream fs = new FileStream(path, FileMode.Create);

        try
        {
            DataContractSerializer ser =
                new DataContractSerializer(typeof(Person));
            ser.WriteObject(fs, p);
            Console.WriteLine("Done");
        }
        catch (SerializationException exc)
        {
            Console.WriteLine(exc.Message);
            Console.WriteLine(exc.StackTrace);
        }
        finally
        {
            fs.Close();
        }
    }
}

<DataContract()>  _
Public Enum Position
    <EnumMember(Value:="Emp")> Employee
    <EnumMember(Value:="Mgr")> Manager
    <EnumMember(Value:="Ctr")> Contractor
    NotASerializableEnumeration
    
End Enum 

<DataContract()>  _
Public Class Person
    Implements IExtensibleDataObject
    
    Public Sub New(ByVal firstNameValue As String, _
       ByVal lastNameValue As String) 
        LastName = firstNameValue
        FirstName = lastNameValue
    
    End Sub 
    
    Private extensioDataValue As ExtensionDataObject 
    
    Public Property ExtensionData() As ExtensionDataObject _
       Implements IExtensibleDataObject.ExtensionData
        Get
            Return extensioDataValue
        End Get
        Set
            extensioDataValue = value
        End Set
    End Property 

    <DataMember()>  _
    Friend FirstName As String

    <DataMember()>  _
    Friend LastName As String

    <DataMember()>  _
    Friend Description As Position

End Class 


NotInheritable Public Class Test
    
    Private Sub New() 
    
    End Sub
    
    Shared Sub Main() 
        WriteObject("Enum.xml")
        Console.ReadLine()
    
    End Sub 
    
    
    Shared Sub WriteObject(ByVal path As String) 
        Console.WriteLine("Writing...")
        Dim p As New Person("Denise", "Smith")
        p.Description = Position.Manager
        
        Dim fs As New FileStream(path, FileMode.Create)
        
        Try
            Dim ser As New DataContractSerializer(GetType(Person))
            ser.WriteObject(fs, p)
            Console.WriteLine("Done")
        Catch exc As SerializationException
            Console.WriteLine(exc.Message)
            Console.WriteLine(exc.StackTrace)
        Finally
            fs.Close()
        End Try
    
    End Sub 
End Class

Observações

Permite EnumMemberAttribute um controlo preciso dos nomes das enumerações à medida que são serializadas.

Para usar EnumMemberAttribute, crie uma enumeração e aplique o DataContractAttribute atributo à enumeração. Depois aplica o EnumMemberAttribute atributo a cada membro que precisa de estar no fluxo de serialização.

Ver também

• DataContractAttribute