IDataContractSurrogate.GetObjectToSerialize(Object, Type) Método

Definición

Espacio de nombres:

System.Runtime.Serialization

Ensamblado:

System.Runtime.Serialization.dll

Durante la serialización, devuelve un objeto que sustituye el objeto especificado.

public:
 System::Object ^ GetObjectToSerialize(System::Object ^ obj, Type ^ targetType);

public object GetObjectToSerialize (object obj, Type targetType);

abstract member GetObjectToSerialize : obj * Type -> obj

Public Function GetObjectToSerialize (obj As Object, targetType As Type) As Object

Parámetros

obj

Object

El objeto que se va a sustituir.

targetType

Type

Type al que el objeto sustituido deberá estar asignado.

Devoluciones

Object

El objeto sustituido que se serializará. DataContractSerializer debe poder serializar este objeto. Por ejemplo, se debe marcar con el atributo DataContractAttribute u otros mecanismos que el serializador reconoce.

Ejemplos

En el siguiente ejemplo se muestra una implementación del método GetObjectToSerialize.

public object GetObjectToSerialize(object obj, Type targetType)
{
        Console.WriteLine("GetObjectToSerialize Invoked");
        Console.WriteLine("\t type name: {0}", obj.ToString());
        Console.WriteLine("\t target type: {0}", targetType.Name);
        // This method is called on serialization.
        // If Person is not being serialized...
        if (obj is Person )
        {
            Console.WriteLine("\t returning PersonSurrogated");
            // ... use the XmlSerializer to perform the actual serialization.
            PersonSurrogated  ps = new PersonSurrogated();
            XmlSerializer xs = new XmlSerializer(typeof(Person));
            StringWriter sw = new StringWriter();
            xs.Serialize(sw, (Person)obj );
            ps.xmlData = sw.ToString();
            return ps;
        }
        return obj;
    }

Public Function GetObjectToSerialize(ByVal obj As Object, _
    ByVal targetType As Type) As Object _
    Implements IDataContractSurrogate.GetObjectToSerialize
    Console.WriteLine("GetObjectToSerialize Invoked")
    Console.WriteLine(vbTab & "type name: {0}", obj.ToString)
    Console.WriteLine(vbTab & "target type: {0}", targetType.Name)
    ' This method is called on serialization.
    ' If Person is not being serialized...
    If TypeOf obj Is Person Then
        Console.WriteLine(vbTab & "returning PersonSurrogated")
        ' ... use the XmlSerializer to perform the actual serialization.
        Dim ps As New PersonSurrogated()
        Dim xs As New XmlSerializer(GetType(Person))
        Dim sw As New StringWriter()
        xs.Serialize(sw, CType(obj, Person))
        ps.xmlData = sw.ToString()
        Return ps
    End If
    Return obj

End Function

Comentarios

Este método no debe devolverse null porque al deserializar los datos se convertirán al tipo Object y se produce una InvalidCastException excepción .