Exception.SerializeObjectState Exception.SerializeObjectState Exception.SerializeObjectState Exception.SerializeObjectState Event

Definition

Tritt auf, wenn eine Ausnahme serialisiert wird, um ein Ausnahmezustandsobjekt mit serialisierten Daten über die Ausnahme zu erstellen.Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

protected:
 event EventHandler<System::Runtime::Serialization::SafeSerializationEventArgs ^> ^ SerializeObjectState;
protected event EventHandler<System.Runtime.Serialization.SafeSerializationEventArgs> SerializeObjectState;
member this.SerializeObjectState : EventHandler<System.Runtime.Serialization.SafeSerializationEventArgs> 
Protected Custom Event SerializeObjectState As EventHandler(Of SafeSerializationEventArgs) 

Beispiele

Das folgende Beispiel definiert eine BadDivisionException , behandelt der SerializeObjectState Ereignis.The following example defines a BadDivisionException that handles the SerializeObjectState event. Es enthält auch ein Zustandsobjekt, d.h. eine geschachtelte Struktur mit dem Namen BadDivisionExceptionState , implementiert die ISafeSerializationData Schnittstelle.It also contains a state object, which is a nested structure named BadDivisionExceptionState that implements the ISafeSerializationData interface.

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

public class Example
{
   public static void Main()
   {
      bool serialized = false;
      var formatter = new BinaryFormatter();
      Double[] values = { 3, 2, 1 };
      Double divisor = 0;
      foreach (var value in values) {
         try {
            BadDivisionException ex = null;
            if (divisor == 0) { 
               if (! serialized) {
                  // Instantiate the exception object.
                  ex = new BadDivisionException(0);
                  // Serialize the exception object.
                  var fs = new FileStream("BadDivision1.dat", 
                                           FileMode.Create);
                  formatter.Serialize(fs, ex);
                  fs.Close();
                  Console.WriteLine("Serialized the exception...");
               }
               else {
                  // Deserialize the exception.
                  var fs = new FileStream("BadDivision1.dat",
                                           FileMode.Open);
                  ex = (BadDivisionException) formatter.Deserialize(fs);
                  // Reserialize the exception.
                  fs.Position = 0;
                  formatter.Serialize(fs, ex);
                  fs.Close();
                  Console.WriteLine("Reserialized the exception...");                                            
               }   
              throw ex; 
            } 
            Console.WriteLine("{0} / {1} = {1}", value, divisor, value/divisor);
         }   
         catch (BadDivisionException e) {
            Console.WriteLine("Bad divisor from a {0} exception: {1}",
                              serialized ? "deserialized" : "new", e.Divisor);             
            serialized = true;
         }   
      }
   }
}

[Serializable] public class BadDivisionException : Exception
{
   // Maintain an internal BadDivisionException state object.
   [NonSerialized] private BadDivisionExceptionState state = new BadDivisionExceptionState();

   public BadDivisionException(Double divisor)
   {
      state.Divisor = divisor;
      HandleSerialization();      
   }
   
   private void HandleSerialization()
   {
      SerializeObjectState += delegate(object exception, SafeSerializationEventArgs eventArgs) 
                                      { 
                                          eventArgs.AddSerializedState(state);
                                      };
   }
   
   public Double Divisor
   { get { return state.Divisor; } }

   [Serializable] private struct BadDivisionExceptionState : ISafeSerializationData 
   {
      private Double badDivisor;
      
      public Double Divisor
      { get { return badDivisor; } 
        set { badDivisor = value; } }

      void ISafeSerializationData.CompleteDeserialization(object deserialized)
      { 
         var ex = deserialized as BadDivisionException;
         ex.HandleSerialization();
         ex.state = this; 
      }
   }
}
// The example displays the following output:
//       Serialized the exception...
//       Bad divisor from a new exception: 0
//       Reserialized the exception...
//       Bad divisor from a deserialized exception: 0
//       Reserialized the exception...
//       Bad divisor from a deserialized exception: 0
Imports System.IO
Imports System.Runtime.Serialization
Imports System.Runtime.Serialization.Formatters.Binary
           
Module Example
   Public Sub Main()
      Dim serialized As Boolean = False
      Dim formatter As New BinaryFormatter()
      Dim values() As Double = { 3, 2, 1 }
      Dim divisor As Double = 0
      For Each value In values
         Try
            Dim ex As BadDivisionException = Nothing
            If divisor = 0 Then 
               If Not serialized Then
                  ' Instantiate the exception object.
                  ex = New BadDivisionException(0)
                  ' Serialize the exception object.
                  Dim fs As New FileStream("BadDivision1.dat", 
                                           FileMode.Create)
                  formatter.Serialize(fs, ex)
                  fs.Close()
                  Console.WriteLine("Serialized the exception...")
               Else
                  ' Deserialize the exception.
                  Dim fs As New FileStream("BadDivision1.dat",
                                           FileMode.Open)
                  ex = CType(formatter.Deserialize(fs), BadDivisionException)
                  ' Reserialize the exception.
                  fs.Position = 0
                  formatter.Serialize(fs, ex)
                  fs.Close()
                  Console.WriteLine("Reserialized the exception...")                                            
               End If   
              Throw ex 
            End If 
            Console.WriteLine("{0} / {1} = {1}", value, divisor, value/divisor)
         Catch e As BadDivisionException
            Console.WriteLine("Bad divisor from a {0} exception: {1}",
                              If(serialized, "deserialized", "new"), e.Divisor)             
            serialized = True
         End Try   
      Next
   End Sub
End Module

<Serializable> Public Class BadDivisionException : Inherits Exception
   ' Maintain an internal BadDivisionException state object.
   <NonSerialized> Private state As New BadDivisionExceptionState()

   Public Sub New(divisor As Double)
      state.Divisor = divisor
      HandleSerialization()      
   End Sub
   
   Private Sub HandleSerialization()
      AddHandler SerializeObjectState, 
                 Sub(exception As Object, eventArgs As SafeSerializationEventArgs)
                    eventArgs.AddSerializedState(state)
                 End Sub
   End Sub
   
   Public ReadOnly Property Divisor As Double
      Get
         Return state.Divisor
      End Get      
   End Property

   <Serializable> Private Structure BadDivisionExceptionState 
                                    Implements ISafeSerializationData
      private badDivisor As Double
      
      Public Property Divisor As Double
         Get
            Return badDivisor
         End Get
         Set
            badDivisor = value
         End Set
      End Property 

      Sub CompleteDeserialization(deserialized As Object) _
            Implements ISafeSerializationData.CompleteDeserialization
         Dim ex As BadDivisionException = TryCast(deserialized, BadDivisionException)
         ex.HandleSerialization()
         ex.state = Me 
      End Sub
   End Structure
End Class
' The example displays the following output:
'       Serialized the exception...
'       Bad divisor from a new exception: 0
'       Reserialized the exception...
'       Bad divisor from a deserialized exception: 0
'       Reserialized the exception...
'       Bad divisor from a deserialized exception: 0

Die BadDivisionException Ausnahme wird ausgelöst, wenn es sich bei eine Gleitkommadivision durch Null auftritt.The BadDivisionException exception is thrown when a floating-point division by zero occurs. Während der ersten Division durch 0 (null) wird das Beispiel instanziiert ein BadDivisionException Objekt, serialisiert und löst die Ausnahme aus.During the first division by zero, the example instantiates a BadDivisionException object, serializes it, and throws the exception. Bei nachfolgenden Bereiche von 0 (null) im Beispiel deserialisiert das zuvor serialisierte Objekt, serialisiert es dann erneut, und löst die Ausnahme.When subsequent divisions by zero occur, the example deserializes the previously serialized object, reserializes it, and throws the exception. Um für die Serialisierung von Objekten, die Deserialisierung, Reserialization und Deserialisierung zu ermöglichen, sich das Beispiel fügt die SerializeObjectState -Ereignishandler sowohl in der BadDivisionException Klassenkonstruktor und klicken Sie in der ISafeSerializationData.CompleteDeserialization Implementierung.To provide for object serialization, deserialization, reserialization, and deserialization, the example adds the SerializeObjectState event handler both in the BadDivisionException class constructor and in the ISafeSerializationData.CompleteDeserialization implementation.

Hinweise

Implementiert das Ausnahmeobjekt für den Status der ISafeSerializationData Schnittstelle.The exception state object implements the ISafeSerializationData interface.

Wenn die SerializeObjectState Ereignis abonniert ist, wird die Ausnahme deserialisiert und als leere Ausnahme erstellt.When the SerializeObjectState event is subscribed to, the exception is deserialized and created as an empty exception. Der Konstruktor der Ausnahme nicht ausgeführt wird, und der Ausnahmezustand auch deserialisiert wird.The exception's constructor is not run, and the exception state is also deserialized. Die CompleteDeserialization Callback-Methode des Ausnahmeobjekts Zustand wird dann benachrichtigt, damit es die leere Ausnahme deserialisierte Daten weitergeben kann.The CompleteDeserialization callback method of the exception state object is then notified so that it can push deserialized data into the empty exception.

Die SerializeObjectState Ereignis können transparent Ausnahmetypen, die zum Serialisieren und Deserialisieren der Ausnahmedaten.The SerializeObjectState event enables transparent exception types to serialize and deserialize exception data. Transparenter Code kann führen Befehle innerhalb der Grenzen des Berechtigungssatzes, in denen es in Betrieb ist, aber kann nicht ausgeführt, aufrufen, abgeleitet oder wichtigen Code enthalten.Transparent code can execute commands within the bounds of the permission set it is operating within, but cannot execute, call, derive from, or contain critical code.

Wenn die SerializeObjectState Ereignis nicht abonniert ist, tritt die Deserialisierung wie gewohnt mit der Exception Konstruktor.If the SerializeObjectState event is not subscribed to, deserialization occurs as usual using the Exception constructor.

In der Regel einen Handler für die SerializeObjectState Ereignis hinzugefügt wird, in der Ausnahme-Konstruktor, um die Serialisierung bereit.Typically, a handler for the SerializeObjectState event is added in the exception's constructor to provide for its serialization. Da der Konstruktor, nicht ist jedoch ausgeführt, wenn die SerializeObjectState -Ereignishandler ausgeführt wird, serialisieren eine deserialisierte-Ausnahme auslösen kann eine SerializationException Ausnahme aus, wenn Sie versuchen, die die Ausnahme zu deserialisieren.But because the constructor is not executed when the SerializeObjectState event handler executes, serializing a deserialized exception can throw a SerializationException exception when you try to deserialize the exception. Um dies zu vermeiden, sollten Sie auch den Handler für Hinzufügen der SerializeObjectState Ereignis in der ISafeSerializationData.CompleteDeserialization Methode.To avoid this, you should also add the handler for the SerializeObjectState event in the ISafeSerializationData.CompleteDeserialization method. Finden Sie im Abschnitt "Beispiele" veranschaulicht.See the Examples section for an illustration.

Hinweise für Vererber

Wenn dieses Ereignis abonniert und verwendet wird, müssen alle abgeleitete Typen, die in der Vererbungshierarchie folgen den gleiche Serialisierungsmechanismus implementieren.If this event is subscribed to and used, all derived types that follow in the inheritance hierarchy must implement the same serialization mechanism.

Gilt für: