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PageStatePersister.Load Method

Overridden by derived classes to deserialize and load persisted state information when a Page object initializes its control hierarchy.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)

public abstract void Load()

Classes that derive from the PageStatePersister class implement the Load method to initialize the ViewState and ControlState properties from some persisted format.

The following code example demonstrates how a class that derives from the PageStatePersister class implements the Load method to load view state from a persistence medium. The StreamPageStatePersister attempts to read data from a stream. It uses an IStateFormatter object to deserialize view state data and initialize the ViewState property and the ControlState property, which a page uses to initialize controls. This code example is part of a larger example provided for the PageStatePersister class.

// 
// Load ViewState and ControlState. 
// 
public override void Load()
{
    Stream stateStream = GetSecureStream();

    // Read the state string, using the StateFormatter.
    StreamReader reader = new StreamReader(stateStream);

    IStateFormatter formatter = this.StateFormatter;
    string fileContents = reader.ReadToEnd();

    // Deserilize returns the Pair object that is serialized in 
    // the Save method.
    Pair statePair = (Pair)formatter.Deserialize(fileContents);

    ViewState = statePair.First;
    ControlState = statePair.Second;
    reader.Close();
    stateStream.Close();
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
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