SafeViewOfFileHandle.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / Microsoft / Win32 / SafeHandles / SafeViewOfFileHandle.cs / 1 / SafeViewOfFileHandle.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  SafeViewOfFileHandle 
**
** 
** A wrapper for file handles
**
**
===========================================================*/ 
using System;
using System.Security; 
using System.Security.Permissions; 
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices; 
using System.Runtime.ConstrainedExecution;
using System.Runtime.Versioning;
using Microsoft.Win32;
using Microsoft.Win32.SafeHandles; 

namespace Microsoft.Win32.SafeHandles 
{ 
    internal sealed class SafeViewOfFileHandle : SafeHandleZeroOrMinusOneIsInvalid
    { 
        [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
        internal SafeViewOfFileHandle() : base(true) {}

        // 0 is an Invalid Handle 
        [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
        internal SafeViewOfFileHandle(IntPtr handle, bool ownsHandle) : base (ownsHandle) { 
            SetHandle(handle); 
        }
 
        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        override protected bool ReleaseHandle()
        { 
            if (Win32Native.UnmapViewOfFile(handle))
            { 
                handle = IntPtr.Zero; 
                return true;
            } 

            return false;
        }
    } 
}

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