ISerializable.GetObjectData(SerializationInfo, StreamingContext) Método

Definição

Popula um SerializationInfo com os dados necessários para serializar o objeto de destino.Populates a SerializationInfo with the data needed to serialize the target object.

public:
 void GetObjectData(System::Runtime::Serialization::SerializationInfo ^ info, System::Runtime::Serialization::StreamingContext context);
[System.Security.SecurityCritical]
public void GetObjectData (System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context);
abstract member GetObjectData : System.Runtime.Serialization.SerializationInfo * System.Runtime.Serialization.StreamingContext -> unit
Public Sub GetObjectData (info As SerializationInfo, context As StreamingContext)

Parâmetros

info
SerializationInfo

O SerializationInfo a ser preenchido com dados.The SerializationInfo to populate with data.

context
StreamingContext

O destino (consulte StreamingContext) dessa serialização.The destination (see StreamingContext) for this serialization.

Atributos

Exceções

O chamador não tem a permissão necessária.The caller does not have the required permission.

Exemplos

O exemplo a seguir usa GetObjectData o método para definir valores alternativos para um objeto serializado.The following example uses the GetObjectData method to set alternate values for a serialized object. O código usa o AddValue método SerializationInfo da classe para armazenar os valores alternativos quando o objeto é serializado.The code uses the AddValue method of the SerializationInfo class to store the alternate values when the object is serialized. Por outro lado, quando o construtor da Person classe é chamado durante a desserialização, os valores de alternatve são recuperados usando o GetValue método e reatribuídos aos campos do objeto.Conversely, when the constructor of the Person class is called during deserialization, the alternatve values are retrieved using the GetValue method and reassigned to the object's fields.

using System;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization;
using System.Security.Permissions;
using System.IO;

[assembly: SecurityPermission(
SecurityAction.RequestMinimum, Execution = true)]
namespace ISerializableExample
{
    class Program
    {
        public static void Main()
        {
            try
            {
                Run();
            }
            catch (Exception exc)
            {
                Console.WriteLine("{0}: {1}", exc.Message, exc.StackTrace);
            }
            finally
            {
                Console.WriteLine("Press Enter to exit....");
                Console.ReadLine();
            }
        }

        static void Run()
        {            
            BinaryFormatter binaryFmt = new BinaryFormatter();
            Person p = new Person();
            p.IdNumber = 1010;
            p.Name = "AAAAA";
            FileStream fs = new FileStream
                ("Person.xml", FileMode.OpenOrCreate);
            binaryFmt.Serialize(fs, p);
            fs.Close();
            Console.WriteLine
                ("Original Name: {0}, Original ID: {1}", p.Name, p.IdNumber);

            // Deserialize.
            fs = new FileStream
                ("Person.xml", FileMode.OpenOrCreate);
            Person p2 = (Person)binaryFmt.Deserialize(fs);
                Console.WriteLine("New Name: {0}, New ID: {1}", p2.Name, p2.IdNumber);
            fs.Close();
            }
        }
    [Serializable]
    public class Person : ISerializable
    {
        private string name_value;
        private int ID_value;

        public Person() { }
        protected Person(SerializationInfo info, StreamingContext context)
        {
            if (info == null)
                throw new System.ArgumentNullException("info");
            name_value = (string)info.GetValue("AltName", typeof(string));
            ID_value = (int)info.GetValue("AltID", typeof(int));
        }

        [SecurityPermission(SecurityAction.LinkDemand,
            Flags = SecurityPermissionFlag.SerializationFormatter)]
        public virtual void GetObjectData(
        SerializationInfo info, StreamingContext context)
        {
            if (info == null)
                throw new System.ArgumentNullException("info");
            info.AddValue("AltName", "XXX");
            info.AddValue("AltID", 9999);
        }

        public string Name
        {
            get { return name_value; }
            set { name_value = value; }
        }

        public int IdNumber
        {
            get { return ID_value; }
            set { ID_value = value; }
        }
    }
}
Imports System.Runtime.Serialization.Formatters.Binary
Imports System.Runtime.Serialization
Imports System.Security.Permissions
Imports System.IO

<Assembly: SecurityPermission _
(SecurityAction.RequestMinimum, Execution:=True)> 

Class Program

    Public Shared Sub Main()
        Try
            Run()
        Catch exc As Exception
            Console.WriteLine("{0}: {1}", exc.Message, exc.StackTrace)
        Finally
            Console.WriteLine("Press Enter to exit....")
            Console.ReadLine()
        End Try

    End Sub

    Shared Sub Run()
        Dim binaryFmt As New BinaryFormatter()
        Dim p As New Person()
        p.IdNumber = 1010
        p.Name = "AAAAA"
        Dim fs As New FileStream("Person.xml", FileMode.OpenOrCreate)
        binaryFmt.Serialize(fs, p)
        fs.Close()
        Console.WriteLine _
        ("Original Name: {0}, Original ID: {1}", p.Name, p.IdNumber)

        ' Deserialize.
        fs = New FileStream("Person.xml", FileMode.OpenOrCreate)
        Dim p2 As Person = CType(binaryFmt.Deserialize(fs), Person)
        Console.WriteLine("New Name: {0}, New ID: {1}", _
        p2.Name, p2.IdNumber)
        fs.Close()
    End Sub
End Class

<Serializable()> _
Public Class Person
    Implements ISerializable
    Private name_value As String
    Private ID_value As Integer

    Public Sub New()

    End Sub

    Protected Sub New(ByVal info As SerializationInfo, _
    ByVal context As StreamingContext)
        If info Is Nothing Then
            Throw New System.ArgumentNullException("info")
        End If
        name_value = CStr(info.GetValue("AltName", GetType(String)))
        ID_value = Fix(info.GetValue("AltID", GetType(Integer)))

    End Sub

    <SecurityPermission(SecurityAction.LinkDemand, _
    Flags:=SecurityPermissionFlag.SerializationFormatter)> _
    Public Overridable Sub GetObjectData _
    (ByVal info As SerializationInfo, _
    ByVal context As StreamingContext) _
    Implements ISerializable.GetObjectData
        If info Is Nothing Then
            Throw New System.ArgumentNullException("info")
        End If
        info.AddValue("AltName", "XXX")
        info.AddValue("AltID", 9999)

    End Sub

    Public Property Name() As String
        Get
            Return name_value
        End Get
        Set(ByVal value As String)
            name_value = value
        End Set
    End Property

    Public Property IdNumber() As Integer
        Get
            Return ID_value
        End Get
        Set(ByVal value As Integer)
            ID_value = value
        End Set
    End Property
End Class

Comentários

Todos os objetos incluídos no SerializationInfo são automaticamente rastreados e serializados pelo formatador.Any objects that are included in the SerializationInfo are automatically tracked and serialized by the formatter.

O código que GetObjectData chama requer SecurityPermission o para fornecer serviços de serialização.Code that calls GetObjectData requires the SecurityPermission for providing serialization services. Enumeração associada: SecurityPermissionFlag.SerializationFormatter.Associated enumeration: SecurityPermissionFlag.SerializationFormatter.

Observação

Não há garantia de que esse método será chamado apenas uma vez por instância de objeto durante a serialização.It is not guaranteed that this method will be called only once per object instance during serialization. Portanto, o método deve ser implementado de forma que seu comportamento seja o mesmo, independentemente do número de vezes que ele é chamado.Therefore, the method should be implemented in such a way that its behavior will be the same regardless of the number of times it is called.

Aplica-se a

Veja também