Question

I would like to apply a folder’s Security Settings to all descendants in C#. Essentially, I would like to do the same thing as ‘Replace all existing inheritable permissions on all descendants with inheritable permissions from this object’ within ‘Advanced Security Settings for [Folder]’.

Are there any elegant ways to approach this?

Answer 1

After some quality time with google and MSDN I came up with the following bit of code. Seems to work just fine.

static void Main(string[] args)
{
    DirectoryInfo dInfo = new DirectoryInfo(@"C:\Test\Folder");
    DirectorySecurity dSecurity = dInfo.GetAccessControl();
    ReplaceAllDescendantPermissionsFromObject(dInfo, dSecurity);
}

static void ReplaceAllDescendantPermissionsFromObject(
    DirectoryInfo dInfo, DirectorySecurity dSecurity)
{
    // Copy the DirectorySecurity to the current directory
    dInfo.SetAccessControl(dSecurity);

    foreach (FileInfo fi in dInfo.GetFiles())
    {
        // Get the file's FileSecurity
        var ac = fi.GetAccessControl();

        // inherit from the directory
        ac.SetAccessRuleProtection(false, false);

        // apply change
        fi.SetAccessControl(ac);
    }
    // Recurse into Directories
    dInfo.GetDirectories().ToList()
        .ForEach(d => ReplaceAllDescendantPermissionsFromObject(d, dSecurity));
}