EventLogRecord.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Diagnostics / Eventing / Reader / EventLogRecord.cs / 1305376 / EventLogRecord.cs

                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class: EventLogRecord 
**
** Purpose: 
** This public class is an EventLog implementation of EventRecord.  An
** instance of this is obtained from an EventLogReader.
**
============================================================*/ 

using System; 
using System.Collections; 
using System.Collections.Generic;
using System.Text; 
using System.Security.Permissions;
using Microsoft.Win32;

namespace System.Diagnostics.Eventing.Reader { 

    [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] 
    public class EventLogRecord : EventRecord { 

        private const int SYSTEM_PROPERTY_COUNT = 18; 

        //
        // access to the data member reference is safe, while
        // invoking methods on it is marked SecurityCritical as appropriate. 
        //
        [System.Security.SecuritySafeCritical] 
        private EventLogHandle handle; 

        private EventLogSession session; 

        private NativeWrapper.SystemProperties systemProperties;
        private string containerChannel;
        private int[] matchedQueryIds; 

        //a dummy object which is used only for the locking. 
        object syncObject; 

        //cached DisplayNames for each instance 
        private string levelName = null;
        private string taskName = null;
        private string opcodeName = null;
        private IEnumerable keywordsNames = null; 

        //cached DisplayNames for each instance 
        private bool levelNameReady; 
        private bool taskNameReady;
        private bool opcodeNameReady; 

        private ProviderMetadataCachedInformation cachedMetadataInformation;

        // marking as TreatAsSafe because just passing around a reference to an EventLogHandle is safe. 
        [System.Security.SecuritySafeCritical]
        internal EventLogRecord(EventLogHandle handle, EventLogSession session, ProviderMetadataCachedInformation cachedMetadataInfo) { 
            this.cachedMetadataInformation = cachedMetadataInfo; 
            this.handle = handle;
            this.session = session; 
            systemProperties = new NativeWrapper.SystemProperties();
            syncObject = new object();
        }
 
        internal EventLogHandle Handle {
            // just returning reference to security critical type, the methods 
            // of that type are protected by SecurityCritical as appropriate. 
            [System.Security.SecuritySafeCritical]
            get { 
                return handle;
            }
        }
 

        internal void PrepareSystemData() { 
 
            if (this.systemProperties.filled)
                return; 

            //prepare the System Context, if it is not already initialized.
            this.session.SetupSystemContext();
 
            lock (this.syncObject) {
                if (this.systemProperties.filled == false) { 
                    NativeWrapper.EvtRenderBufferWithContextSystem(this.session.renderContextHandleSystem, this.handle, UnsafeNativeMethods.EvtRenderFlags.EvtRenderEventValues, this.systemProperties, SYSTEM_PROPERTY_COUNT); 
                    this.systemProperties.filled = true;
                } 
            }
        }

        public override int Id { 
            get {
                PrepareSystemData(); 
                if (this.systemProperties.Id == null) 
                    return 0;
                return (int)this.systemProperties.Id; 
            }
        }

        public override byte? Version { 
            get {
                PrepareSystemData(); 
                return this.systemProperties.Version; 
            }
        } 

        public override int? Qualifiers {
            get {
                PrepareSystemData(); 
                return (int?)(uint?)this.systemProperties.Qualifiers;
            } 
        } 

        public override byte? Level { 
            get {
                PrepareSystemData();
                return this.systemProperties.Level;
            } 
        }
 
        public override int? Task { 
            get {
                PrepareSystemData(); 
                return (int?)(uint?)this.systemProperties.Task;
            }
        }
 
        public override short? Opcode {
            get { 
                PrepareSystemData(); 
                return (short?)(ushort?)this.systemProperties.Opcode;
            } 
        }

        public override long? Keywords {
            get { 
                PrepareSystemData();
                return (long?)this.systemProperties.Keywords; 
            } 
        }
 
        public override long? RecordId {
            get {
                PrepareSystemData();
                return (long?)this.systemProperties.RecordId; 
            }
        } 
 
        public override string ProviderName {
            get { 
                PrepareSystemData();
                return this.systemProperties.ProviderName;
            }
        } 

        public override Guid? ProviderId { 
            get { 
                PrepareSystemData();
                return this.systemProperties.ProviderId; 
            }
        }

        public override string LogName { 
            get {
                PrepareSystemData(); 
                return this.systemProperties.ChannelName; 
            }
        } 

        public override int? ProcessId {
            get {
                PrepareSystemData(); 
                return (int?)this.systemProperties.ProcessId;
            } 
        } 

        public override int? ThreadId { 
            get {
                PrepareSystemData();
                return (int?)this.systemProperties.ThreadId;
            } 
        }
 
        public override string MachineName { 
            get {
                PrepareSystemData(); 
                return this.systemProperties.ComputerName;
            }
        }
 
        public override System.Security.Principal.SecurityIdentifier UserId {
            get { 
                PrepareSystemData(); 
                return this.systemProperties.UserId;
            } 
        }

        public override DateTime? TimeCreated {
            get { 
                PrepareSystemData();
                return this.systemProperties.TimeCreated; 
            } 
        }
 
        public override Guid? ActivityId {
            get {
                PrepareSystemData();
                return this.systemProperties.ActivityId; 
            }
        } 
 
        public override Guid? RelatedActivityId {
            get { 
                PrepareSystemData();
                return this.systemProperties.RelatedActivityId;
            }
        } 

        public string ContainerLog { 
            get { 
                if (this.containerChannel != null)
                    return this.containerChannel; 
                lock (this.syncObject) {
                    if (this.containerChannel == null) {
                        this.containerChannel = (string)NativeWrapper.EvtGetEventInfo(this.Handle, UnsafeNativeMethods.EvtEventPropertyId.EvtEventPath);
                    } 
                    return this.containerChannel;
                } 
            } 
        }
 
        public IEnumerable MatchedQueryIds {
            get {
                if (this.matchedQueryIds != null)
                    return this.matchedQueryIds; 
                lock (this.syncObject) {
                    if (this.matchedQueryIds == null) { 
                        this.matchedQueryIds = (int[])NativeWrapper.EvtGetEventInfo(this.Handle, UnsafeNativeMethods.EvtEventPropertyId.EvtEventQueryIDs); 
                    }
                    return this.matchedQueryIds; 
                }
            }
        }
 

        public override EventBookmark Bookmark { 
            [System.Security.SecuritySafeCritical] 
            get {
                EventLogPermissionHolder.GetEventLogPermission().Demand(); 

                EventLogHandle bookmarkHandle = NativeWrapper.EvtCreateBookmark(null);
                NativeWrapper.EvtUpdateBookmark(bookmarkHandle, this.handle);
                string bookmarkText = NativeWrapper.EvtRenderBookmark(bookmarkHandle); 

                return new EventBookmark(bookmarkText); 
            } 
        }
 
        public override string FormatDescription() {

            return this.cachedMetadataInformation.GetFormatDescription(this.ProviderName, this.handle);
        } 

        public override string FormatDescription(IEnumerable values) { 
            if (values == null) return this.FormatDescription(); 

            //copy the value IEnumerable to an array. 
            string[] theValues = new string[0];
            int i = 0;
            foreach (object o in values) {
                if ( theValues.Length == i ) 
                    Array.Resize( ref theValues, i+1 );
                theValues[i] = o.ToString(); 
                i++; 
            }
 
            return this.cachedMetadataInformation.GetFormatDescription(this.ProviderName, this.handle, theValues);
        }

        public override string LevelDisplayName { 
            get {
                if ( this.levelNameReady ) 
                    return this.levelName; 
                lock (this.syncObject) {
                    if (this.levelNameReady == false) { 
                        this.levelNameReady = true;
                        this.levelName = this.cachedMetadataInformation.GetLevelDisplayName(this.ProviderName, this.handle);
                    }
                    return this.levelName; 
                }
            } 
        } 

 
        public override string OpcodeDisplayName {
            get {
                lock (this.syncObject) {
                    if (this.opcodeNameReady == false) { 
                        this.opcodeNameReady = true;
                        this.opcodeName = this.cachedMetadataInformation.GetOpcodeDisplayName(this.ProviderName, this.handle); 
 
                    }
                    return this.opcodeName; 
                }
            }
        }
 
        public override string TaskDisplayName {
            get { 
                if (this.taskNameReady == true) 
                    return this.taskName;
                lock (this.syncObject) { 
                    if (this.taskNameReady == false) {
                        this.taskNameReady = true;
                        this.taskName = this.cachedMetadataInformation.GetTaskDisplayName(this.ProviderName, this.handle);
                    } 
                    return this.taskName;
                } 
            } 
        }
 
        public override IEnumerable KeywordsDisplayNames {
            get {
                if (this.keywordsNames != null)
                    return this.keywordsNames; 
                lock (this.syncObject) {
                    if (this.keywordsNames == null) { 
                        this.keywordsNames = this.cachedMetadataInformation.GetKeywordDisplayNames(this.ProviderName, this.handle); 
                    }
                    return this.keywordsNames; 
                }
            }
        }
 

        public override IList Properties { 
            get { 
                this.session.SetupUserContext();
                IList properties = NativeWrapper.EvtRenderBufferWithContextUserOrValues(this.session.renderContextHandleUser, this.handle); 
                List list = new List();
                foreach (object value in properties) {
                    list.Add(new EventProperty(value));
                } 
                return list;
            } 
        } 

        public IList GetPropertyValues(EventLogPropertySelector propertySelector) { 
            if (propertySelector == null)
                throw new ArgumentNullException("propertySelector");
            return NativeWrapper.EvtRenderBufferWithContextUserOrValues(propertySelector.Handle, this.handle);
        } 

        // marked as SecurityCritical because it allocates SafeHandle 
        // marked as TreatAsSafe because it performs Demand. 
        [System.Security.SecuritySafeCritical]
        public override string ToXml() { 
            EventLogPermissionHolder.GetEventLogPermission().Demand();
            StringBuilder renderBuffer = new StringBuilder(2000);
            NativeWrapper.EvtRender(EventLogHandle.Zero, this.handle, UnsafeNativeMethods.EvtRenderFlags.EvtRenderEventXml, renderBuffer);
            return renderBuffer.ToString(); 
        }
 
        [System.Security.SecuritySafeCritical] 
        protected override void Dispose(bool disposing) {
            try { 

                if (disposing) {
                    EventLogPermissionHolder.GetEventLogPermission().Demand();
                } 

                if ( this.handle != null && !this.handle.IsInvalid ) 
                    this.handle.Dispose(); 
            }
            finally { 
                base.Dispose(disposing);
            }
        }
 
        // marked as SecurityCritical because allocates SafeHandle.
        [System.Security.SecurityCritical] 
        internal static EventLogHandle GetBookmarkHandleFromBookmark(EventBookmark bookmark) { 
            if (bookmark == null)
                return EventLogHandle.Zero; 
            EventLogHandle handle = NativeWrapper.EvtCreateBookmark(bookmark.BookmarkText);
            return handle;
        }
    } 

} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

                        

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