IDataContractSurrogate.GetObjectToSerialize(Object, Type) Метод

Определение

При выполнении сериализации возвращает объект, заменяющий указанный объект.During serialization, returns an object that substitutes the specified object.

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

Параметры

obj
Object

Заменяемый объект.The object to substitute.

targetType
Type

Тип Type, который назначается замененному объекту.The Type that the substituted object should be assigned to.

Возвращаемое значение

Object

Замененный объект, который будет сериализован.The substituted object that will be serialized. Этот объект должен быть сериализуем методом DataContractSerializer.The object must be serializable by the DataContractSerializer. Например, он должен быть помечен атрибутом DataContractAttribute или другими распознаваемыми сериализатором механизмами.For example, it must be marked with the DataContractAttribute attribute or other mechanisms that the serializer recognizes.

Примеры

В следующем примере показана реализация метода GetObjectToSerialize.The following example shows an implementation of the GetObjectToSerialize method.

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

Комментарии

Этот метод не должен возвращать значение, null поскольку при десериализации данные будут приведены к типу Object , а InvalidCastException создается исключение.This method must not return null because on deserialization the data will be cast to type Object and an InvalidCastException is thrown.

Применяется к