请问如何取得操作系统安装安装时间

Question

请问如何取得操作系统安装安装时间，请给点代码

Answer 1

        public DateTime GetOSInstallDateTime()
        {
            DateTime result = DateTime.Now;            try
            {
                System.Management.ConnectionOptions oConn = new ConnectionOptions();
                oConn.Impersonation = System.Management.ImpersonationLevel.Impersonate;                System.Management.ManagementScope oMs = new System.Management.ManagementScope("\\\\127.0.0.1", oConn);
                System.Management.ObjectQuery oQuery = new System.Management.ObjectQuery("Select * from Win32_OperatingSystem");                System.Management.ManagementObjectSearcher oSearcher = new System.Management.ManagementObjectSearcher(oMs, oQuery);
                System.Management.ManagementObjectCollection objList = oSearcher.Get();                foreach (System.Management.ManagementObject oMobj in objList)
                {
                    string test = oMobj["InstallDate"].ToString();
                    result = DateTime.ParseExact(test.Substring(0, 14), "yyyyMMddHHmmss", null);
                    break;
                }
            }
            catch { }            return result;
        }

Answer 2

 public DateTime GetOSInstallDateTime()
        {
            DateTime result = DateTime.Now;            try
            {
                System.Management.ConnectionOptions oConn = new ConnectionOptions();
                oConn.Impersonation = System.Management.ImpersonationLevel.Impersonate;                System.Management.ManagementScope oMs = new System.Management.ManagementScope("\\\\127.0.0.1", oConn);
                System.Management.ObjectQuery oQuery = new System.Management.ObjectQuery("Select * from Win32_OperatingSystem");                System.Management.ManagementObjectSearcher oSearcher = new System.Management.ManagementObjectSearcher(oMs, oQuery);
                System.Management.ManagementObjectCollection objList = oSearcher.Get();                foreach (System.Management.ManagementObject oMobj in objList)
                {
                    string test = oMobj["InstallDate"].ToString();
                    result = DateTime.ParseExact(test.Substring(0, 14), "yyyyMMddHHmmss", null);
                    break;
                }
            }
            catch { }            return result;
        }

Answer 3

System.Management
这个命名空间是什么啊
我用的是。net 2005我 好像引用不出来啊