IDataContractSurrogate.GetObjectToSerialize(Object, Type) 方法
定义
重要
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在序列化期间，返回一个替换指定对象的对象。
public:
System::Object ^ GetObjectToSerialize(System::Object ^ obj, Type ^ targetType);public object GetObjectToSerialize (object obj, Type targetType);abstract member GetObjectToSerialize : obj * Type -> objPublic Function GetObjectToSerialize (obj As Object, targetType As Type) As Object参数
- obj
- Object
要替换的对象。
返回
将要序列化的被替换对象。 该对象必须可由 DataContractSerializer 序列化。 例如，必须用 DataContractAttribute 属性或序列化程序可识别的其他机制对它进行标记。
示例
下面的示例演示 GetObjectToSerialize 方法的实现。
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
注解
此方法不能返回 null ，因为在反序列化时，数据将被强制转换为类型 Object 并引发一个 InvalidCastException 。