SurrogateSelector-Klasse
Unterstützt Formatierungsprogrammen bei der Auswahl eines Serialisierungsersatzes, an den der Serialisierungs- oder Deserialisierungsvorgang delegiert werden soll.
Namespace: System.Runtime.Serialization
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<ComVisibleAttribute(True)> _
Public Class SurrogateSelector
Implements ISurrogateSelector
'Usage
Dim instance As SurrogateSelector
[ComVisibleAttribute(true)]
public class SurrogateSelector : ISurrogateSelector
[ComVisibleAttribute(true)]
public ref class SurrogateSelector : ISurrogateSelector
/** @attribute ComVisibleAttribute(true) */
public class SurrogateSelector implements ISurrogateSelector
ComVisibleAttribute(true)
public class SurrogateSelector implements ISurrogateSelector
Hinweise
Ein Serialisierungsersatz stellt dem Benutzer ein Objekt zur Verfügung, das die Serialisierungsanforderungen eines anderen Objekts behandeln und die Serialisierungsdaten ggf. transformieren kann.
Beispiel
Im folgenden Codebeispiel wird das Erstellen einer Serialisierungsersatzklasse veranschaulicht, die eine selbst nicht serialisierbare Klasse ordnungsgemäß serialisieren oder deserialisieren kann. Außerdem wird in diesem Beispiel das Wiederherstellen nach einer SerializationException veranschaulicht.
using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters;
using System.Runtime.Serialization.Formatters.Binary;
// This class is not serializable.
class Employee
{
public String name, address;
public Employee(String name, String address)
{
this.name = name;
this.address = address;
}
}
// This class can manually serialize an Employee object.
sealed class EmployeeSerializationSurrogate : ISerializationSurrogate
{
// Serialize the Employee object to save the objects name and address fields.
public void GetObjectData(Object obj,
SerializationInfo info, StreamingContext context)
{
Employee emp = (Employee) obj;
info.AddValue("name", emp.name);
info.AddValue("address", emp.address);
}
// Deserialize the Employee object to set the objects name and address fields.
public Object SetObjectData(Object obj,
SerializationInfo info, StreamingContext context,
ISurrogateSelector selector)
{
Employee emp = (Employee) obj;
emp.name = info.GetString("name");
emp.address = info.GetString("address");
return null;
}
}
public sealed class App
{
static void Main()
{
// This sample uses the BinaryFormatter.
IFormatter formatter = new BinaryFormatter();
// Create a MemoryStream that the object will be serialized into and deserialized from.
using (Stream stream = new MemoryStream())
{
// Create a SurrogateSelector.
SurrogateSelector ss = new SurrogateSelector();
// Tell the SurrogateSelector that Employee objects are serialized and deserialized
// using the EmployeeSerializationSurrogate object.
ss.AddSurrogate(typeof(Employee),
new StreamingContext(StreamingContextStates.All),
new EmployeeSerializationSurrogate());
// Associate the SurrogateSelector with the BinaryFormatter.
formatter.SurrogateSelector = ss;
try
{
// Serialize an Employee object into the memory stream.
formatter.Serialize(stream, new Employee("Jeff", "1 Microsoft Way"));
}
catch (SerializationException e)
{
Console.WriteLine("Serialization failed: {0}", e.Message);
throw;
}
// Rewind the MemoryStream.
stream.Position = 0;
try
{
// Deserialize the Employee object from the memory stream.
Employee emp = (Employee) formatter.Deserialize(stream);
// Verify that it all worked.
Console.WriteLine("Name = {0}, Address = {1}", emp.name, emp.address);
}
catch (SerializationException e)
{
Console.WriteLine("Deserialization failed: {0}", e.Message);
throw;
}
}
}
}
// This code produces the following output.
//
// Name = Jeff, Address = 1 Microsoft Way
Vererbungshierarchie
System.Object
System.Runtime.Serialization.SurrogateSelector
Threadsicherheit
Alle öffentlichen statischen (Shared in Visual Basic) Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.
Plattformen
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
Siehe auch
Referenz
SurrogateSelector-Member
System.Runtime.Serialization-Namespace