EventLogHandle.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 / EventLogHandle.cs / 1305376 / EventLogHandle.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class: EventLogHandle 
**
** Purpose: 
** This internal class is a SafeHandle implementation over a
** native EVT_HANDLE - obtained from EventLog Native Methods.
**
============================================================*/ 
using System;
using System.Runtime.InteropServices; 
using System.Security.Permissions; 

namespace System.Diagnostics.Eventing.Reader { 

    //
    // Marked as SecurityCritical due to link demands from inherited
    // SafeHandle members. 
    //
 
    // marked as Safe since the only real operation that is performed 
    // by this class is NativeWrapper.EvtClose and that is protected
    // by a full Demand() before doing any work. 
    [System.Security.SecuritySafeCritical]
    internal sealed class EventLogHandle : SafeHandle {
        // Called by P/Invoke when returning SafeHandles
        private EventLogHandle() 
            : base(IntPtr.Zero, true) {
        } 
 
        internal EventLogHandle(IntPtr handle, bool ownsHandle)
            : base(IntPtr.Zero, ownsHandle) { 
            SetHandle(handle);
        }

        public override bool IsInvalid { 
            get {
                return IsClosed || handle == IntPtr.Zero; 
            } 
        }
 
        protected override bool ReleaseHandle() {
            NativeWrapper.EvtClose(handle);
            handle = IntPtr.Zero;
            return true; 
        }
 
        // DONT compare EventLogHandle with EventLogHandle.Zero 
        // use IsInvalid instead. Zero is provided where a NULL handle needed
        public static EventLogHandle Zero { 
            get {
                return new EventLogHandle();
            }
        } 
    }
} 

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

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