C# 获取windows 系统开关机时间

关机时间，引用：https://www.coder.work/article/1589448

public static DateTime GetLastSystemShutdown()

{

string sKey = @"System\CurrentControlSet\Control\Windows";

Microsoft.Win32.RegistryKey key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(sKey);

string sValueName = "ShutdownTime";

byte\[\] val = (byte\[\])key.GetValue(sValueName);

long valueAsLong = BitConverter.ToInt64(val, 0);

return DateTime.FromFileTime(valueAsLong);

}

开机时间：

public static DateTime GetStartTime()

{

DateTime n = DateTime.Now;

foreach (var o in new ManagementObjectSearcher("SELECT LastBootUpTime FROM Win32_OperatingSystem").Get())

{

var obj = (ManagementObject)o;

var LastBootUpTime = obj.GetPropertyValue("LastBootUpTime").ToString();

LastBootUpTime = LastBootUpTime.Split('.').FirstOrDefault();

System.IFormatProvider format = new System.Globalization.CultureInfo("zh-CN", true);

//string strDateFormat = "yyyyMMdd";

n = DateTime.ParseExact(LastBootUpTime, "yyyyMMddHHmmss", format, DateTimeStyles.AllowWhiteSpaces);

break;

}

return n;

}