打开文件没有（真的）锁定它？

Question

Is it possible to open a file in a way that allows subsequent deletion/renaming of its parent folder?

I know you can do this:

File.Open("foo.bar", FileMode.Open, FileAccess.Read, FileShare.Read | FileShare.Delete)

Which will allow for the file to be deleted when the file handle is closed. However, if it does not allow the parent folder to be deleted without error.

I couldn't find anything in the framework. Have I overlooked something, or is there a native API I can interop to.

Note: I don't care if I get an exception when using the stream of the deleted file. In fact that would be ideal.

UPDATE:

So the most promising idea was the Hardlink , however I just can't make it work. I still end up with Access Denied when i try to delete the parent directory. Here is my code:

class Program
{
    [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    static extern bool CreateHardLink(string lpFileName, string lpExistingFileName, IntPtr lpSecurityAttributes);

    static void Main(string[] args)
    {
        string hardLinkPath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
        string realPath = @"C:\foo\bar.txt";
        if (CreateHardLink(hardLinkPath, realPath, IntPtr.Zero))
        {
            using (FileStream stream = File.Open(hardLinkPath, FileMode.Open, FileAccess.Read, FileShare.Delete | FileShare.ReadWrite))
            {
                Console.Write("File locked");
                Console.ReadLine();
            }

            File.Delete(hardLinkPath);
        }
        else
            Console.WriteLine("LastError:{0}", Marshal.GetLastWin32Error());
    }
}

Answer 1

如果您正在使用NTFS，您可以在临时位置创建另一个文件的硬链接，您将避免文件复制开销，并且第一个链接仍然可以删除（文件本身或包含目录）而不会影响第二。

Answer 2

The best solution I can come up with, is to copy the file to a temporary scratch location. Then, open the temp file, and delete it when I'm finished.

Answer 3

FileOpen uses CreateFile in Kernel32.dll. I'm not sure you'll be able to achieve anything more than the .NET framework provides you with, as all the options are already there, unless you perform it as a transaction .