SessionStateUtility.GetHttpSessionStateFromContext(HttpContext) Metoda

public:
 static System::Web::SessionState::IHttpSessionState ^ GetHttpSessionStateFromContext(System::Web::HttpContext ^ context);

public static System.Web.SessionState.IHttpSessionState GetHttpSessionStateFromContext (System.Web.HttpContext context);

static member GetHttpSessionStateFromContext : System.Web.HttpContext -> System.Web.SessionState.IHttpSessionState

Public Shared Function GetHttpSessionStateFromContext (context As HttpContext) As IHttpSessionState

Parametry

Návraty

Instance IHttpSessionState implementace naplněná daty relace z aktuálního požadavku.

Příklady

Následující příklad kódu ukazuje obslužnou rutinu ReleaseRequestState události ve vlastním modulu stavu relace. Modul načte data relace z HttpContext aktuálního požadavku pomocí GetHttpSessionStateFromContext metody . Tento příklad kódu je součástí většího příkladu SessionStateUtility pro třídu.

//
// Event handler for HttpApplication.ReleaseRequestState
//

private void OnReleaseRequestState(object source, EventArgs args)
{
    HttpApplication app = (HttpApplication)source;
    HttpContext context = app.Context;
    string sessionID;

    // Read the session state from the context
    HttpSessionStateContainer stateProvider =
      (HttpSessionStateContainer)(SessionStateUtility.GetHttpSessionStateFromContext(context));

    // If Session.Abandon() was called, remove the session data from the local Hashtable
    // and execute the Session_OnEnd event from the Global.asax file.
    if (stateProvider.IsAbandoned)
    {
        try
        {
            pHashtableLock.AcquireWriterLock(Int32.MaxValue);

            sessionID = pSessionIDManager.GetSessionID(context);
            pSessionItems.Remove(sessionID);
        }
        finally
        {
            pHashtableLock.ReleaseWriterLock();
        }

        SessionStateUtility.RaiseSessionEnd(stateProvider, this, EventArgs.Empty);
    }

    SessionStateUtility.RemoveHttpSessionStateFromContext(context);
}

'
' Event handler for HttpApplication.ReleaseRequestState
'
Private Sub OnReleaseRequestState(ByVal [source] As Object, ByVal args As EventArgs)
    Dim app As HttpApplication = CType([source], HttpApplication)
    Dim context As HttpContext = app.Context
    Dim sessionID As String

    ' Read the session state from the context
    Dim stateProvider As HttpSessionStateContainer = _
       CType(SessionStateUtility.GetHttpSessionStateFromContext(context), HttpSessionStateContainer)

    ' If Session.Abandon() was called, remove the session data from the local Hashtable
    ' and execute the Session_OnEnd event from the Global.asax file.
    If stateProvider.IsAbandoned Then
        Try
            pHashtableLock.AcquireWriterLock(Int32.MaxValue)

            sessionID = pSessionIDManager.GetSessionID(context)
            pSessionItems.Remove(sessionID)
        Finally
            pHashtableLock.ReleaseWriterLock()
        End Try

        SessionStateUtility.RaiseSessionEnd(stateProvider, Me, EventArgs.Empty)
    End If

  SessionStateUtility.RemoveHttpSessionStateFromContext(context)
End Sub

Poznámky

Metodu GetHttpSessionStateFromContext může modul stavu relace použít k načtení dat relace z aktuálního požadavku. K tomu dochází během ReleaseRequestState události na konci požadavku. Vrácená data relace se pak dají zapsat do úložiště dat relace. Pokud byla relace ukončena, je možné data relace odebrat z úložiště dat a HttpContextspustit událost Session_OnEnd .

Poznámky pro dědice

Můžete použít metodu RemoveHttpSessionStateFromContext(HttpContext) k odebrání dat relace z interního úložiště a metodu RaiseSessionEnd(IHttpSessionState, Object, EventArgs) pro vyvolání Session_OnEnd události.

Platí pro