ISessionIDManager 接口

参考

定义

命名空间:: System.Web.SessionState

程序集:: System.Web.dll

重要

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定义自定义会话状态标识符管理器必须实现的协定。

public interface class ISessionIDManager

public interface ISessionIDManager

type ISessionIDManager = interface

Public Interface ISessionIDManager

派生: System.Web.SessionState.SessionIDManager

示例

下面的代码示例演示了实现基于 Cookie 的会话 ID 管理器的类。

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

注解

接口 ISessionIDManager 标识必须实现的方法，以便为会话标识符值创建自定义管理器。 ISessionIDManager接口实现创建并验证会话标识符值，并管理 HTTP 响应中会话标识符的存储以及从 HTTP 请求检索会话标识符值。可以使用 sessionIDManagerTypesessionState 元素的属性 (ASP.NET 设置架构) 配置元素启用自定义会话 ID 管理器。

ISessionIDManager如果接口实现将支持无 Cookie 会话标识符，则需要实现用于在 URL 中发送和检索会话标识符的解决方案，例如 ISAPI 筛选器。

如果只想提供 ASP.NET 会话状态要使用的自定义会话标识符值，则可以创建一个继承 SessionIDManager 类的类，并使用自己的自定义实现仅 CreateSessionID 替代和 Validate 方法。这使你可以提供自己的会话标识符值，同时依赖基 SessionIDManager 类将值存储到 HTTP 响应并从 HTTP 请求中检索值。有关重写 SessionIDManager 类和实现这些方法的示例，请参阅为 CreateSessionID 类的 SessionIDManager 方法提供的示例。

方法

CreateSessionID(HttpContext)	创建一个唯一的会话标识符。
GetSessionID(HttpContext)	从当前 HTTP 请求的上下文中获取会话标识符。
Initialize()	初始化 SessionIDManager 对象。
InitializeRequest(HttpContext, Boolean, Boolean)	针对每个请求执行 SessionIDManager 对象的初始化。
RemoveSessionID(HttpContext)	从 Cookie 或 URL 删除会话标识符。
SaveSessionID(HttpContext, String, Boolean, Boolean)	将新创建的会话标识符保存到 HTTP 响应。
Validate(String)	确认提供的会话标识符有效。

适用于

另请参阅

ASP.NET 会话状态概述

ISessionIDManager 接口

定义

示例

注解

方法

适用于

另请参阅

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