MSDNSafeHandle示例

可能是一个愚蠢的问题......我是C#和.Net的新手.

在MSDN上的SafeHandle类(C#)的示例中,代码让我抓狂了一下.

[SecurityPermission(SecurityAction.InheritanceDemand, UnmanagedCode = true)]
[SecurityPermission(SecurityAction.Demand, UnmanagedCode = true)]
internal class MySafeFileHandle : SafeHandleZeroOrMinusOneIsInvalid
{
    private MySafeFileHandle()
      : base(true)
    {}
    // other code here
}

[SuppressUnmanagedCodeSecurity()]
internal static class NativeMethods
{
    // other code...

    // Allocate a file object in the kernel, then return a handle to it.
    [DllImport("kernel32", SetLastError = true, CharSet = CharSet.Unicode)]
    internal extern static MySafeFileHandle CreateFile(String fileName,
       int dwDesiredAccess, System.IO.FileShare dwShareMode,
       IntPtr securityAttrs_MustBeZero, System.IO.FileMode    
       dwCreationDisposition, int dwFlagsAndAttributes, 
       IntPtr hTemplateFile_MustBeZero);

    // other code...
}

// Later in the code the handle is created like this:
MySafeFileHandle tmpHandle;
tmpHandle = NativeMethods.CreateFile(fileName, NativeMethods.GENERIC_READ,
            FileShare.Read, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero);

我的问题是: C函数的Win32 HANDLE如何CreateFile进入MySafeFileHandle受保护的IntPtr"handle"变量对象？构造函数MySafeFileHandle是私有的,甚至不IntPtr作为参数!

对CreateFile声明的评论说了些什么

... CLR的平台编组层将以原子方式将句柄存储到SafeHandle对象中.

我不确定我到底知道这意味着什么,有人可以解释一下吗？