ISessionIDManager 接口

定义

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 (ASP.NET 设置架构) 配置元素 的 属性启用自定义会话 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。

另请参阅

• ASP.NET 会话状态概述