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Asked: 2026-05-11T05:55:29+00:00

Running as an elevated admin on Vista SP1, my C# app tries to set

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Running as an elevated admin on Vista SP1, my C# app tries to set the following rule with the following code. No error is produced, but neither is any change on the directory’s ACL. What am I missing?

public static void Main( string args[] ) {     string dirPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData), 'Company'), 'Product' );     Directory.Create(dirPath);     _SetAcl(dirPath, 'Users', FileSystemRights.FullControl); }  private static void _SetAcl(string path, string identity, FileSystemRights rights) {     var info = new DirectoryInfo(path);     var acl = info.GetAccessControl();      var rule1 = new FileSystemAccessRule(identity, rights, AccessControlType.Allow);     bool modified;     acl.ModifyAccessRule(AccessControlModification.Reset, rule1, out modified);      var inheritanceFlags = InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit;     var rule2 = new FileSystemAccessRule(identity, rights, inheritanceFlags,                                         PropagationFlags.InheritOnly, AccessControlType.Allow);     acl.ModifyAccessRule(AccessControlModification.Add, rule2, out modified); }

Update: Just add the following code as the last line of the _SetAcl method, and my code is good to go.

info.SetAccessControl(acl);
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1 Answer

  1. To finish the process you must call DirectoryInfo.SetAccessControl() with the modified ACL.

    GetAccessControl() really returns a copy of the ACL. You’re free to modify it but it won’t take effect until you call SetAccessControl()

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