IDataContractSurrogate.GetObjectToSerialize(Object, Type) 方法

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

參數

傳回

將被序列化的替換物件。 該物件必須可由 DataContractSerializer序列化。 例如，必須標示 DataContractAttribute 序列器識別的屬性或其他機制。

範例

以下範例展示了該 GetObjectToSerialize 方法的實作。

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

備註

此方法不應回傳 null ，因為在反序列化時資料會被鑄造成型別 Object ，並拋出 a InvalidCastException 。