使用FileStream创建文件并应用FileAttributes

Question

Is it possible while creating the file with FileStream also apply FileAttributes at the same time? I would like to create file for stream writing with FileAttributes.Temporary file attribute.

Answer 1

You can use FileOptions.DeleteOnClose as one of parameters. File will be automatically removed after you finish your operations and dispose a stream.

Answer 2

You can do this if you use the Win32 CreateFile method

uint readAccess = 0x00000001;
uint writeAccess = 0x00000002;

uint readShare = 0x00000001;   

uint createAlways = 2;

uint tempAttribute = 0x100;
uint deleteOnClose = 0x04000000; 

new FileStream(new SafeFileHandle(NativeMethods.CreateFile("filename", 
                                                           readAccess | writeAccess, 
                                                           readShare, 
                                                           IntPtr.Zero, 
                                                           createAlways, 
                                                           tempAttribute | deleteOnClose, 
                                                           IntPtr.Zero), 
                                  true), 
               FileAccess.ReadWrite, 4096, true);


private static class NativeMethods
{
    [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    internal static extern IntPtr CreateFile(string name, uint accessMode, uint shareMode, IntPtr security, uint createMode, uint flags, IntPtr template);
}

For more information, see the MSDN documentation of CreateFile

Answer 3

是的，您当然也可以通过使用File.SetAttributes方法来应用FileAttributes

Answer 4

Why do you need to do it all at once?

1. Just create the file (using File.Create or, if its a temporary file, use GetTempFileName .)
2. Set the attributes on the newly created file
3. Open the file using whatever method suits you