设置服务器文件的访问权限

        /// <summary>
        /// 为创建的临时文件分配权限
        /// </summary>
        /// <param name="pathname">文件路径</param>
        /// 如：D:\aqi\Aqioo.Apps\Aqioo.Apps\Aqioo.Apps.Web\xml\constellation.xml
        /// <param name="username">用户名（一般用：ASPNET）</param>
        /// <param name="power">权限</param>
        /// <remarks>SKY 2007-8-6</remarks>
        public static void AddpathPower(string pathname, string username, string power)
        {

            DirectoryInfo dirinfo = new DirectoryInfo(pathname);

            if ((dirinfo.Attributes & FileAttributes.ReadOnly) != 0)
            {
                dirinfo.Attributes = FileAttributes.Normal;
            }

            //取得访问控制列表
            DirectorySecurity dirsecurity = dirinfo.GetAccessControl();

            switch (power)
            {
                case "FullControl":
                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.FullControl, InheritanceFlags.ContainerInherit, PropagationFlags.InheritOnly, AccessControlType.Allow));
                    break;
                case "ReadOnly":
                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.Read, AccessControlType.Allow));
                    break;
                case "Write":
                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.Write, AccessControlType.Allow));
                    break;
                case "Modify":
                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.Modify, AccessControlType.Allow));
                    break;
            }
        }