ISessionIDManager 介面

定義

public interface class ISessionIDManager

public interface ISessionIDManager

type ISessionIDManager = interface

Public Interface ISessionIDManager

衍生

System.Web.SessionState.SessionIDManager

範例

下列程式代碼範例示範實作 Cookie 型會話標識碼管理員的類別。

using System;
using System.Configuration;
using System.Web.Configuration;
using System.Web;
using System.Web.SessionState;

namespace Samples.AspNet.Session
{

  public class MySessionIDManager : IHttpModule, ISessionIDManager
  {

    private SessionStateSection pConfig = null;

    //
    // IHttpModule Members
    //

    //
    // IHttpModule.Init
    //

    public void Init(HttpApplication app)
    {
      // Obtain session-state configuration settings.

      if (pConfig == null)
      {
        Configuration cfg =
          WebConfigurationManager.OpenWebConfiguration(System.Web.Hosting.HostingEnvironment.ApplicationVirtualPath);
        pConfig = (SessionStateSection)cfg.GetSection("system.web/sessionState");
      }
    }

    //
    // IHttpModule.Dispose
    //

    public void Dispose()
    {
    }

    //
    // ISessionIDManager Members
    //

    //
    // ISessionIDManager.Initialize
    //

    public void Initialize()
    {
    }

    //
    // ISessionIDManager.InitializeRequest
    //

    public bool InitializeRequest(HttpContext context, 
                                  bool suppressAutoDetectRedirect, 
                                  out bool supportSessionIDReissue)
    {
      if (pConfig.Cookieless == HttpCookieMode.UseCookies)
      {
        supportSessionIDReissue = false;
        return false;
      }
      else
      {
        supportSessionIDReissue = true;
        return context.Response.IsRequestBeingRedirected;
      }
    }

    //
    // ISessionIDManager.GetSessionID
    //
    public string GetSessionID(HttpContext context)
    {
      string id = null;

      if (pConfig.Cookieless == HttpCookieMode.UseUri)
      {
        // Retrieve the SessionID from the URI.
      }
      else
      {
        id = context.Request.Cookies[pConfig.CookieName].Value;
      }      

      // Verify that the retrieved SessionID is valid. If not, return null.

      if (!Validate(id))
        id = null;

      return id;
    }

    //
    // ISessionIDManager.CreateSessionID
    //

    public string CreateSessionID(HttpContext context)
    {
      return Guid.NewGuid().ToString();
    }

    //
    // ISessionIDManager.RemoveSessionID
    //

    public void RemoveSessionID(HttpContext context)
    {
      context.Response.Cookies.Remove(pConfig.CookieName);
    }

    //
    // ISessionIDManager.SaveSessionID
    //

    public void SaveSessionID(HttpContext context, string id, out bool redirected, out bool cookieAdded)
    {
      redirected = false;
      cookieAdded = false;

      if (pConfig.Cookieless == HttpCookieMode.UseUri)
      {
        // Add the SessionID to the URI. Set the redirected variable as appropriate.

        redirected = true;
        return;
      }
      else
      {
        context.Response.Cookies.Add(new HttpCookie(pConfig.CookieName, id));
        cookieAdded = true;
      }
    }

    //
    // ISessionIDManager.Validate
    //

    public bool Validate(string id)
    {
      try
      {
        Guid testGuid = new Guid(id);

        if (id == testGuid.ToString())
          return true;
      }
      catch
      {
      }

      return false;
    }
  }
}

Imports System.Configuration
Imports System.Web.Configuration
Imports System.Web
Imports System.Web.SessionState


Namespace Samples.AspNet.Session


  Public Class MySessionIDManager
    Implements IHttpModule, ISessionIDManager

    Private pConfig As SessionStateSection = Nothing

    '
    ' IHttpModule Members
    '

    '
    ' IHttpModule.Init
    '

    Public Sub Init(app As HttpApplication) Implements IHttpModule.Init
    
      ' Obtain session-state configuration settings.

      If pConfig Is Nothing Then      
        Dim cfg As System.Configuration.Configuration = _
          WebConfigurationManager.OpenWebConfiguration( _
            System.Web.Hosting.HostingEnvironment.ApplicationVirtualPath)
        pConfig = CType(cfg.GetSection("system.web/sessionState"), SessionStateSection)
      End If

    End Sub


    '
    ' IHttpModule.Dispose
    '

    Public Sub Dispose() Implements IHttpModule.Dispose
    
    End Sub



    '
    ' ISessionIDManager.Initialize
    '

    Public Sub Initialize() Implements ISessionIDManager.Initialize

    End Sub


    '
    ' ISessionIDManager.InitializeRequest
    '

    Public Function InitializeRequest(context As HttpContext,  _
                                      suppressAutoDetectRedirect As Boolean,  _
                                      ByRef supportSessionIDReissue As Boolean) As Boolean _
                                      Implements ISessionIDManager.InitializeRequest

      If pConfig.Cookieless = HttpCookieMode.UseCookies Then
        supportSessionIDReissue = False
        Return False
      Else
        supportSessionIDReissue = True
        Return context.Response.IsRequestBeingRedirected
      End If
    End Function



    '
    ' ISessionIDManager Members
    '


    '
    ' ISessionIDManager.GetSessionID
    '
    Public Function GetSessionID(context As HttpContext) As String _
      Implements ISessionIDManager.GetSessionID
    
      Dim id As String = Nothing

      If pConfig.Cookieless = HttpCookieMode.UseUri Then
        ' Retrieve the SessionID from the URI.
      Else
        id = context.Request.Cookies(pConfig.CookieName).Value
      End If    

      ' Verify that the retrieved SessionID is valid. If not, return Nothing.

      If Not Validate(id) Then _
        id = Nothing

      Return id
    End Function

    '
    ' ISessionIDManager.CreateSessionID
    '

    Public Function CreateSessionID(context As HttpContext) As String _
      Implements ISessionIDManager.CreateSessionID
    
      Return Guid.NewGuid().ToString()
    End Function

    '
    ' ISessionIDManager.RemoveSessionID
    '

    Public Sub RemoveSessionID(context As HttpContext) _
      Implements ISessionIDManager.RemoveSessionID

      context.Response.Cookies.Remove(pConfig.CookieName)

    End Sub


    '
    ' ISessionIDManager.SaveSessionID
    '

    Public Sub SaveSessionID(context As HttpContext, _
                             id As String, _
                             ByRef redirected As Boolean, _
                             ByRef cookieAdded As Boolean) _
      Implements ISessionIDManager.SaveSessionID
    
      redirected = False
      cookieAdded = False

      If pConfig.Cookieless = HttpCookieMode.UseUri Then

        ' Add the SessionID to the URI. Set the redirected variable as appropriate.

        redirected = True
        Return
      Else
        context.Response.Cookies.Add(New HttpCookie(pConfig.CookieName, id))
        cookieAdded = True
      End If
    End Sub


    '
    ' ISessionIDManager.Validate
    '

    Public Function Validate(id As String) As Boolean _
      Implements ISessionIDManager.Validate
    
      Try
        Dim testGuid As Guid = New Guid(id)

        If id = testGuid.ToString() Then _
          Return True
      Catch
      
      End Try

      Return False
    End Function

  End Class
End Namespace

備註

ISessionIDManager介面會識別您必須實作的方法，以建立會話標識碼值的自定義管理員。 ISessionIDManager介面實作會建立及驗證會話標識碼值，以及管理 HTTP 回應中的會話標識符儲存，以及從 HTTP 要求擷取會話標識碼值。 您可以使用 sessionState 元素的 屬性來啟用自定義會話識別碼管理員sessionIDManagerType， (ASP.NET 設定架構) 組態專案。

ISessionIDManager如果您的介面實作將支援無 Cookie 會話識別碼，您必須實作解決方案，以在 URL 中傳送和擷取工作階段標識碼，例如 ISAPI 篩選器。

如果您只想要提供自定義會話標識碼值供 ASP.NET 會話狀態使用，您可以建立繼承 類別的 SessionIDManager 類別，並使用您自己的自定義實作只 CreateSessionID 覆寫 和 Validate 方法。 這可讓您提供自己的會話標識碼值，同時依賴基 SessionIDManager 類將值儲存至 HTTP 回應，並從 HTTP 要求擷取值。 如需覆 SessionIDManager 寫 類別和實作這些方法的範例，請參閱為 CreateSessionID 類別的 SessionIDManager 方法提供的範例。

另請參閱

• ASP.NET 工作階段狀態概觀