Ruft einen Wert aus dem SerializationInfo-Speicher ab.
Public Function GetValue ( _ name As String, _ type As Type _ ) As Object
Dim instance As SerializationInfo Dim name As String Dim type As Type Dim returnValue As Object returnValue = instance.GetValue(name, _ type)
public Object GetValue( string name, Type type )
public: Object^ GetValue( String^ name, Type^ type )
public Object GetValue( String name, Type type )
public function GetValue( name : String, type : Type ) : Object
Der dem abzurufenden Wert zugeordnete Name.
Der Type des abzurufenden Werts. Wenn der gespeicherte Wert nicht in diesen Typ konvertiert werden kann, löst das System eine InvalidCastException aus.
Das Objekt vom angegebenen Type, dem der name zugeordnet ist.
Der name oder der type ist nullNothingnullptrNULL-Verweis (Nothing in Visual Basic).
Der Wert, dem der name zugeordnet ist, kann nicht in den type konvertiert werden.
In der aktuellen Instanz wurde kein Element mit dem angegebenen Namen gefunden.
Wenn die in der SerializationInfo gespeicherten Daten dem angeforderten Typ oder einer seiner abgeleiteten Klassen entsprechen, wird dieser Wert direkt zurückgegeben. Andernfalls wird IFormatterConverter..::.Convert aufgerufen, um den Wert in den entsprechenden Typ zu konvertieren.
Der von der GetValue-Methode zurückgegebene Wert kann stets problemlos in den im type-Parameter angegebenen Typ umgewandelt werden.
Im folgenden Codebeispiel wird die Verwendung der GetValue-Methode veranschaulicht.
' A serializable LinkedList example. For the full LinkedList implementation ' see the Serialization sample. <Serializable()> Class LinkedList Implements ISerializable Public Shared Sub Main() End Sub Private m_head As Node = Nothing Private m_tail As Node = Nothing ' Serializes the object. Public Sub GetObjectData(info As SerializationInfo, _ context As StreamingContext) Implements ISerializable.GetObjectData ' Stores the m_head and m_tail references in the SerializationInfo info. info.AddValue("head", m_head, m_head.GetType()) info.AddValue("tail", m_tail, m_tail.GetType()) End Sub ' Constructor that is called automatically during deserialization. ' Reconstructs the object from the information in SerializationInfo info. Private Sub New(info As SerializationInfo, context As StreamingContext) Dim temp As New Node(0) ' Retrieves the values of Type temp.GetType() from SerializationInfo info. m_head = CType(info.GetValue("head", temp.GetType()), Node) m_tail = CType(info.GetValue("tail", temp.GetType()), Node) End Sub End Class
// A serializable LinkedList example. For the full LinkedList implementation // see the Serialization sample. [Serializable()] class LinkedList: ISerializable { public static void Main() {} Node m_head = null; Node m_tail = null; // Serializes the object. [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter=true)] public void GetObjectData(SerializationInfo info, StreamingContext context){ // Stores the m_head and m_tail references in the SerializationInfo info. info.AddValue("head", m_head, m_head.GetType()); info.AddValue("tail", m_tail, m_tail.GetType()); } // Constructor that is called automatically during deserialization. // Reconstructs the object from the information in SerializationInfo info [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter=true)] private LinkedList(SerializationInfo info, StreamingContext context) { Node temp = new Node(0); // Retrieves the values of Type temp.GetType() from SerializationInfo info m_head = (Node)info.GetValue("head", temp.GetType()); m_tail = (Node)info.GetValue("tail", temp.GetType()); } }
// A serializable LinkedList example. For the full LinkedList implementation // see the Serialization sample. [Serializable] ref class LinkedList: public ISerializable { private: Node^ m_head; Node^ m_tail; // Serializes the object. public: virtual void GetObjectData( SerializationInfo^ info, StreamingContext /*context*/ ) { // Stores the m_head and m_tail references in the SerializationInfo info. info->AddValue( "head", m_head, m_head->GetType() ); info->AddValue( "tail", m_tail, m_tail->GetType() ); } // Constructor that is called automatically during deserialization. private: // Reconstructs the object from the information in SerializationInfo info LinkedList( SerializationInfo^ info, StreamingContext /*context*/ ) { Node^ temp = gcnew Node( 0 ); // Retrieves the values of Type temp.GetType() from SerializationInfo info m_head = dynamic_cast<Node^>(info->GetValue( "head", temp->GetType() )); m_tail = dynamic_cast<Node^>(info->GetValue( "tail", temp->GetType() )); } };
// A serializable LinkedList example. For the full LinkedList implementation // see the Serialization sample. /** @attribute Serializable() */ class LinkedList implements ISerializable { public static void main(String[] args) { } //main private Node m_head = null; private Node m_tail = null; // Serializes the object. /** @attribute SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter=true) */ public void GetObjectData(SerializationInfo info, StreamingContext context) { // Stores the m_head and m_tail references in the SerializationInfo // info. info.AddValue("head", m_head, m_head.GetType()); info.AddValue("tail", m_tail, m_tail.GetType()); } // GetObjectData // Constructor that is called automatically during deserialization. // Reconstructs the object from the information in SerializationInfo info /** @attribute SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter=true) */ private LinkedList(SerializationInfo info, StreamingContext context) { Node temp = new Node(0); // Retrieves the values of Type temp.GetType() from SerializationInfo // info m_head = ((Node)(info.GetValue("head", temp.GetType()))); m_tail = ((Node)(info.GetValue("tail", temp.GetType()))); } //LinkedList } //LinkedList
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