File Permission

DarkSorrow38

I was just trying to give file premission to my dummy files but encountered a problem. I found out that only the last applied permission is imposed on the file while rest are overriden or not applied.

using System;
using System.IO;
public class RegistryEditor
{
public static void Main()
{
try
{
FileInfo f = new FileInfo(@"C:\Test.txt");
f.Attributes = FileAttributes.System;
FileInfo f1 = new FileInfo(@"C:\Test.txt");
f1.Attributes = FileAttributes.ReadOnly;
FileInfo f2 = new FileInfo(@"C:\Test.txt");
f2.Attributes = FileAttributes.Hidden;
FileInfo i = new FileInfo(@"C:\Test1.txt");
i.Attributes = FileAttributes.System;
i.Attributes = FileAttributes.Hidden;
i.Attributes = FileAttributes.ReadOnly;
}
catch (Exception ex)
{
Console.Write(ex.ToString());
}
}
}

Banking establishments are more dangerous then standing armies.

Luc Pattyn

Hi,

int i;
i=1;
i=2;
i=4;

Now what is the final value of i? Is it 7? Why would it be any different with file attributes? File attributes are flags, i.e. they have a binary pattern with one bit set, all others cleared. So you can OR them together (with the '|' operator) to get combinations of them. :)

Luc Pattyn

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OriginalGriff

You are going to kick yourself! You are, you are...

Ishaan Karnik wrote:

        FileInfo f = new FileInfo(@"C:\\Test.txt");
        f.Attributes = FileAttributes.System;

Assume it works: the attributes for the file are now "System"

Ishaan Karnik wrote:

        FileInfo f1 = new FileInfo(@"C:\\Test.txt");
        f1.Attributes = FileAttributes.ReadOnly;

Assume it works: the attributes for the file are now "ReadOnly" Had you considered?

        FileInfo f1 = new FileInfo(@"C:\\Test.txt");
        f1.Attributes += FileAttributes.ReadOnly;

What are the attributes now? I told you, you would kick yourself!

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Lost User

Except that if it already was ReadOnly, it will be Hidden and not ReadOnly anymore. (ReadOnly = 1, Hidden = 2)

OriginalGriff

Yes you are right, I'll start kicking myself when I stop typing: it should be "|=" not "+=" :doh:

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DarkSorrow38

OriginalGriff, Yes, i had considered FileInfo i = new FileInfo(@"C:\Test.txt"); i.Attributes += FileAttributes.ReadOnly; But this gives an error Operator ' += ' cannot be applied to operands of type 'System.IO.FileAttributes' and 'System.IO.FileAttributes'. Luc Pattyn, ThankYou. Your suggestion worked.

Luc Pattyn

you're welcome. :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Local announcement (Antwerp region): Lange Wapper? Neen!