SessionStateUtility.GetSessionStaticObjects(HttpContext) Metode

Definisi

Ruang nama:

System.Web.SessionState

Rakitan:

System.Web.dll

Mendapatkan referensi ke koleksi objek statis untuk konteks yang ditentukan.

public:
 static System::Web::HttpStaticObjectsCollection ^ GetSessionStaticObjects(System::Web::HttpContext ^ context);

public static System.Web.HttpStaticObjectsCollection GetSessionStaticObjects (System.Web.HttpContext context);

static member GetSessionStaticObjects : System.Web.HttpContext -> System.Web.HttpStaticObjectsCollection

Public Shared Function GetSessionStaticObjects (context As HttpContext) As HttpStaticObjectsCollection

Parameter

context

HttpContext

HttpContext dari mana untuk mendapatkan koleksi objek statis.

Mengembalikan

HttpStaticObjectsCollection

Koleksi HttpStaticObjectsCollection yang diisi dengan StaticObjects nilai properti untuk yang ditentukan HttpContext.

Contoh

Contoh kode berikut menunjukkan handler untuk AcquireRequestState peristiwa dalam modul keadaan sesi kustom. Modul mengambil informasi sesi yang ada atau membuat informasi sesi baru, termasuk koleksi yang HttpStaticObjectsCollection dikembalikan dari GetSessionStaticObjects metode , dan menambahkannya ke HttpContext permintaan saat ini. Contoh kode ini adalah bagian dari contoh yang lebih besar yang disediakan untuk SessionStateUtility kelas .

//
// Event handler for HttpApplication.AcquireRequestState
//

private void OnAcquireRequestState(object source, EventArgs args)
{
    HttpApplication app = (HttpApplication)source;
    HttpContext context = app.Context;
    bool isNew = false;
    string sessionID;
    SessionItem sessionData = null;
    bool supportSessionIDReissue = true;

    pSessionIDManager.InitializeRequest(context, false, out supportSessionIDReissue);
    sessionID = pSessionIDManager.GetSessionID(context);

    if (sessionID != null)
    {
        try
        {
            pHashtableLock.AcquireReaderLock(Int32.MaxValue);
            sessionData = (SessionItem)pSessionItems[sessionID];

            if (sessionData != null)
               sessionData.Expires = DateTime.Now.AddMinutes(pTimeout);
        }
        finally
        {
            pHashtableLock.ReleaseReaderLock();
        }
    }
    else
    {
        bool redirected, cookieAdded;

        sessionID = pSessionIDManager.CreateSessionID(context);
        pSessionIDManager.SaveSessionID(context, sessionID, out redirected, out cookieAdded);

        if (redirected)
            return;
    }

    if (sessionData == null)
    {
        // Identify the session as a new session state instance. Create a new SessionItem
        // and add it to the local Hashtable.

        isNew = true;

        sessionData = new SessionItem();

        sessionData.Items = new SessionStateItemCollection();
        sessionData.StaticObjects = SessionStateUtility.GetSessionStaticObjects(context);
        sessionData.Expires = DateTime.Now.AddMinutes(pTimeout);

        try
        {
            pHashtableLock.AcquireWriterLock(Int32.MaxValue);
            pSessionItems[sessionID] = sessionData;
        }
        finally
        {
            pHashtableLock.ReleaseWriterLock();
        }
    }

    // Add the session data to the current HttpContext.
    SessionStateUtility.AddHttpSessionStateToContext(context,
                     new HttpSessionStateContainer(sessionID,
                                                  sessionData.Items,
                                                  sessionData.StaticObjects,
                                                  pTimeout,
                                                  isNew,
                                                  pCookieMode,
                                                  SessionStateMode.Custom,
                                                  false));

    // Execute the Session_OnStart event for a new session.
    if (isNew && Start != null)
    {
        Start(this, EventArgs.Empty);
    }
}

//
// Event for Session_OnStart event in the Global.asax file.
//

public event EventHandler Start;

    '
    ' Event handler for HttpApplication.AcquireRequestState
    '
    Private Sub OnAcquireRequestState(ByVal [source] As Object, ByVal args As EventArgs)
        Dim app As HttpApplication = CType([source], HttpApplication)
        Dim context As HttpContext = app.Context
        Dim isNew As Boolean = False
        Dim sessionID As String
        Dim sessionData As SessionItem = Nothing
        Dim supportSessionIDReissue As Boolean = True

        pSessionIDManager.InitializeRequest(context, False, supportSessionIDReissue)
        sessionID = pSessionIDManager.GetSessionID(context)


        If Not (sessionID Is Nothing) Then
            Try
                pHashtableLock.AcquireReaderLock(Int32.MaxValue)
                sessionData = CType(pSessionItems(sessionID), SessionItem)

                If Not (sessionData Is Nothing) Then
                    sessionData.Expires = DateTime.Now.AddMinutes(pTimeout)
                End If
            Finally
                pHashtableLock.ReleaseReaderLock()
            End Try
        Else
            Dim redirected, cookieAdded As Boolean

            sessionID = pSessionIDManager.CreateSessionID(context)
            pSessionIDManager.SaveSessionID(context, sessionID, redirected, cookieAdded)

            If redirected Then Return
        End If
        If sessionData Is Nothing Then
            ' Identify the session as a new session state instance. Create a new SessionItem
            ' and add it to the local Hashtable.
            isNew = True

            sessionData = New SessionItem()

            sessionData.Items = New SessionStateItemCollection()
            sessionData.StaticObjects = SessionStateUtility.GetSessionStaticObjects(context)
            sessionData.Expires = DateTime.Now.AddMinutes(pTimeout)

            Try
                pHashtableLock.AcquireWriterLock(Int32.MaxValue)
                pSessionItems(sessionID) = sessionData
            Finally
                pHashtableLock.ReleaseWriterLock()
            End Try
        End If

        ' Add the session data to the current HttpContext.
        SessionStateUtility.AddHttpSessionStateToContext(context, _
                         New HttpSessionStateContainer(sessionID, _
                                                      sessionData.Items, _
                                                      sessionData.StaticObjects, _
                                                      pTimeout, _
                                                      isNew, _
                                                      pCookieMode, _
                                                      SessionStateMode.Custom, _
                                                      False))

        ' Execute the Session_OnStart event for a new session.
        If isNew Then RaiseEvent Start(Me, EventArgs.Empty)
    End Sub


    '
    ' Event for Session_OnStart event in the Global.asax file.
    '
Public Event Start As EventHandler

Keterangan

Metode GetSessionStaticObjects ini digunakan untuk mengambil kumpulan objek statis yang ditentukan dalam file Global.asax untuk aplikasi ASP.NET. Implementasi modul keadaan sesi akan menyediakan koleksi yang dikembalikan HttpStaticObjectsCollection ke IHttpSessionState instans implementasi yang ditambahkan ke konteks saat ini menggunakan AddHttpSessionStateToContext metode .

SessionStateStoreProviderBase juga dapat menggunakan GetSessionStaticObjects metode saat membuat SessionStateStoreData objek.