SessionStateUtil.cs source code in C# .NET

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                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / State / SessionStateUtil.cs / 1 / SessionStateUtil.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * SessionStateUtil 
 *
 */ 
namespace System.Web.SessionState {
    using System.Collections;
    using System.Web;
    using System.Web.Util; 
    using System.IO;
    using System.Xml; 
    using System.Security.Permissions; 
    using System.Collections.Generic;
 
    /// 
    ///    [To be supplied.]
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public static class SessionStateUtility {
        internal const String               SESSION_KEY = "AspSession"; 
 
        // Called by custom session state module if they want to raise Session_End.
        static public void RaiseSessionEnd(IHttpSessionState session, Object eventSource, EventArgs eventArgs) { 
            HttpApplicationFactory.EndSession(new HttpSessionState(session), eventSource, eventArgs);
        }

        // Called by custom session state module 
        static public void AddHttpSessionStateToContext(HttpContext context, IHttpSessionState container) {
            HttpSessionState sessionState = new HttpSessionState(container); 
 
            try {
                context.Items.Add(SESSION_KEY, sessionState); 
            }
            catch (ArgumentException) {
                throw new HttpException(SR.GetString(SR.Cant_have_multiple_session_module));
            } 
        }
 
        static internal void AddDelayedHttpSessionStateToContext(HttpContext context, SessionStateModule module) { 
            context.AddDelayedHttpSessionState(module);
        } 

        static internal void RemoveHttpSessionStateFromContext(HttpContext context, bool delayed) {
            if (delayed) {
                context.RemoveDelayedHttpSessionState(); 
            }
            else { 
                context.Items.Remove(SESSION_KEY); 
            }
        } 

        // Called by custom session state module
        static public void RemoveHttpSessionStateFromContext(HttpContext context) {
            RemoveHttpSessionStateFromContext(context, false); 
        }
 
        // Called by custom session state module 
        static public IHttpSessionState GetHttpSessionStateFromContext(HttpContext context) {
                return context.Session.Container; 
        }

        static public HttpStaticObjectsCollection GetSessionStaticObjects(HttpContext context) {
            return context.Application.SessionStaticObjects.Clone(); 
        }
 
        internal static SessionStateStoreData CreateLegitStoreData(HttpContext context, 
                                                    ISessionStateItemCollection sessionItems,
                                                    HttpStaticObjectsCollection staticObjects, 
                                                    int timeout) {
            if (sessionItems == null) {
                sessionItems = new SessionStateItemCollection();
            } 

            if (staticObjects == null && context != null) { 
                staticObjects = SessionStateUtility.GetSessionStaticObjects(context); 
            }
 
            return new SessionStateStoreData(sessionItems, staticObjects, timeout);
        }

 
        // This method will take an item and serialize it
        internal static void Serialize(SessionStateStoreData item, Stream stream) { 
            bool    hasItems = true; 
            bool    hasStaticObjects = true;
 
            BinaryWriter writer = new BinaryWriter(stream);
            writer.Write(item.Timeout);

            if (item.Items == null || item.Items.Count == 0) { 
                hasItems = false;
            } 
            writer.Write(hasItems); 

            if (item.StaticObjects == null || item.StaticObjects.NeverAccessed) { 
                hasStaticObjects = false;
            }
            writer.Write(hasStaticObjects);
 
            if (hasItems) {
                ((SessionStateItemCollection)item.Items).Serialize(writer); 
            } 

            if (hasStaticObjects) { 
                item.StaticObjects.Serialize(writer);
            }

            // Prevent truncation of the stream 
            writer.Write(unchecked((byte)0xff));
        } 
 
        // This will deserialize and return an item.
        // This version uses the default classes for SessionStateItemCollection, HttpStaticObjectsCollection 
        // and SessionStateStoreData
        internal static SessionStateStoreData Deserialize(HttpContext context, Stream    stream) {

            int                 timeout; 
            SessionStateItemCollection   sessionItems;
            bool                hasItems; 
            bool                hasStaticObjects; 
            HttpStaticObjectsCollection staticObjects;
            Byte                eof; 

            Debug.Assert(context != null);

            try { 
                BinaryReader reader = new BinaryReader(stream);
                timeout = reader.ReadInt32(); 
                hasItems = reader.ReadBoolean(); 
                hasStaticObjects = reader.ReadBoolean();
 
                if (hasItems) {
                    sessionItems = SessionStateItemCollection.Deserialize(reader);
                }
                else { 
                    sessionItems = new SessionStateItemCollection();
                } 
 
                if (hasStaticObjects) {
                    staticObjects = HttpStaticObjectsCollection.Deserialize(reader); 
                }
                else {
                    staticObjects = SessionStateUtility.GetSessionStaticObjects(context);
                } 

                eof = reader.ReadByte(); 
                if (eof != 0xff) { 
                    throw new HttpException(SR.GetString(SR.Invalid_session_state));
                } 
            }
            catch (EndOfStreamException) {
                throw new HttpException(SR.GetString(SR.Invalid_session_state));
            } 

            return new SessionStateStoreData(sessionItems, staticObjects, timeout); 
        } 

        static internal void SerializeStoreData(SessionStateStoreData item, int initialStreamSize, out byte[] buf, out int length) { 
            MemoryStream s = null;

            try {
                s = new MemoryStream(initialStreamSize); 

                SessionStateUtility.Serialize(item, s); 
                buf = s.GetBuffer(); 
                length = (int) s.Length;
            } 
            finally {
                if (s != null) {
                    s.Close();
                } 
            }
        } 
    } 

}
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SessionStateUtil.cs source code in C# .NET

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