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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / tx / System / Transactions / SafeIUnknown.cs / 1305376 / SafeIUnknown.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Transactions { using System; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; using System.Runtime.ConstrainedExecution; using System.Security.Permissions; // Keep an interface pointer that will not be used in a SafeHandle derived so // that it will be properly released. internal sealed class SafeIUnknown : SafeHandle { // This constructor is called by ComInterop [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")] internal SafeIUnknown() : base(IntPtr.Zero, true) { } // This constructor is called by ComInterop [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")] internal SafeIUnknown(IntPtr unknown) : base(IntPtr.Zero, true) { RuntimeHelpers.PrepareConstrainedRegions(); try {} finally { base.handle = unknown; } } public override bool IsInvalid { get { return (IsClosed || (IntPtr.Zero == base.handle)); } } override protected bool ReleaseHandle() { // NOTE: The SafeHandle class guarantees this will be called exactly once. IntPtr ptr = base.handle; base.handle = IntPtr.Zero; if (IntPtr.Zero != ptr) { Marshal.Release(ptr); } return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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