safetransactionhandle.cs

C#高级编程第6版随书源代码 值得下载

using System;
using System.Runtime.Versioning;
using System.Security.Permissions;
using Microsoft.Win32.SafeHandles;

namespace Wrox.ProCSharp.Transactions
{
    [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)]
    public sealed class SafeTransactionHandle : SafeHandleZeroOrMinusOneIsInvalid
    {
        private SafeTransactionHandle()
            : base(true)
        {
        }

        public SafeTransactionHandle(IntPtr preexistingHandle, bool ownsHandle)
            : base(ownsHandle)
        {
            SetHandle(preexistingHandle);
        }

        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        protected override bool ReleaseHandle()
        {
            return NativeMethods.CloseHandle(handle);
        }

    }
}