C#修改文件或文件夾的權限：如何為指定用戶和用戶組添加完全控制權限

//給Excel文件添加"Everyone,Users"用戶組的完全控制權限  
FileInfo fi = new FileInfo(excelPath);  
System.Security.AccessControl.FileSecurity fileSecurity = fi.GetAccessControl();  
fileSecurity.AddAccessRule(new FileSystemAccessRule("Everyone", FileSystemRights.FullControl, AccessControlType.Allow));  
fileSecurity.AddAccessRule(new FileSystemAccessRule("Users", FileSystemRights.FullControl, AccessControlType.Allow));  
fi.SetAccessControl(fileSecurity);  
      
//給Excel文件所在目錄添加"Everyone,Users"用戶組的完全控制權限  
DirectoryInfo di = new DirectoryInfo(Path.GetDirectoryName(excelPath));  
System.Security.AccessControl.DirectorySecurity dirSecurity = di.GetAccessControl();  
dirSecurity.AddAccessRule(new FileSystemAccessRule("Everyone", FileSystemRights.FullControl, AccessControlType.Allow));  
dirSecurity.AddAccessRule(new FileSystemAccessRule("Users", FileSystemRights.FullControl, AccessControlType.Allow));  
di.SetAccessControl(dirSecurity);

URL：http://www.bianceng.cn/Programming/csharp/201410/45778.htm