SafeIUnknown.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 / 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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