PageStatePersister.Save Method
Definition
Important
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Overridden by derived classes to serialize persisted state information when a Page object is unloaded from memory.
public:
abstract void Save();
public abstract void Save ();
abstract member Save : unit -> unit
Public MustOverride Sub Save ()
Examples
The following code example demonstrates how a class that derives from the PageStatePersister class implements the Save method to persist view state to a persistence medium. The StreamPageStatePersister
uses an IStateFormatter object to serialize the contents of the ViewState property and ControlState property. This code example is part of a larger example provided for the PageStatePersister class.
//
// Persist any ViewState and ControlState.
//
public override void Save()
{
if (ViewState != null || ControlState != null)
{
if (Page.Session != null)
{
Stream stateStream = GetSecureStream();
StreamWriter writer = new StreamWriter(stateStream);
IStateFormatter formatter = this.StateFormatter;
Pair statePair = new Pair(ViewState, ControlState);
// Serialize the statePair object to a string.
string serializedState = formatter.Serialize(statePair);
writer.Write(serializedState);
writer.Close();
stateStream.Close();
}
else
{
throw new InvalidOperationException("Session needed for StreamPageStatePersister.");
}
}
}
'
' Persist any ViewState and ControlState.
'
Public Overrides Sub Save()
If Not (ViewState Is Nothing) OrElse Not (ControlState Is Nothing) Then
If Not (Page.Session Is Nothing) Then
Dim stateStream As Stream
stateStream = GetSecureStream()
' Write a state string, using the StateFormatter.
Dim writer As New StreamWriter(stateStream)
Dim formatter As IStateFormatter
formatter = Me.StateFormatter
Dim statePair As New Pair(ViewState, ControlState)
Dim serializedState As String
serializedState = formatter.Serialize(statePair)
writer.Write(serializedState)
writer.Close()
stateStream.Close()
Else
Throw New InvalidOperationException("Session needed for StreamPageStatePersister.")
End If
End If
End Sub
Remarks
Classes that derive from the PageStatePersister class implement the Save method to persist the contents of the ViewState and ControlState properties to a persistence medium.
Applies to
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