使用 .NET 获取上次 Windows 关闭事件的日期时间

发布于 2024-08-08 15:38:20 字数 199 浏览 5 评论 0原文

有没有办法找出系统上次关闭的时间?

我知道有一种方法可以使用 WMI 使用 Win32_OperatingSystem 命名空间中的 LastBootUpTime 属性找出上次启动时间。

有没有类似的东西可以查出上次关机时间?

谢谢。

Is there a way to find out when the system was last shutdown?

I know there's a way to find out last boot up time using the LastBootUpTime property in Win32_OperatingSystem namespace using WMI.

Is there anything similar to find out last shutdown time?

Thanks.

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评论(3

奢欲 2024-08-15 15:38:20

(这里的一切都是 100% 由 JDunkerley 的早期回答)

解决方案如上所述,但是从 byte 数组到 DateTime 的方法使用 BitConverter 可以通过更少的语句来实现。以下六行代码执行相同的操作,并从注册表中给出正确的 DateTime

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);
}

(everything here is 100% courtesy of JDunkerley's earlier answer)

The solution is above, but the approach of going from a byte array to DateTime can be achieved with fewer statements using the BitConverter.The following six lines of code do the same and give the correct DateTime from the registry:

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);
}
云柯 2024-08-15 15:38:20

假设 Windows 顺利关闭。它将它存储在注册表中:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows\ShutdownTime

它存储为字节数组,但它是一个 FILETIME。

虽然可能有更好的方法,但我之前已经使用过并且认为它有效:

    public static DateTime GetLastSystemShutdown()
    {
        string sKey = @"System\CurrentControlSet\Control\Windows";
        Microsoft.Win32.RegistryKey key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(sKey);

        string sValueName = "ShutdownTime";
        object val = key.GetValue(sValueName);

        DateTime output = DateTime.MinValue;
        if (val is byte[] && ((byte[])val).Length == 8)
        {
            byte[] bytes = (byte[])val;

            System.Runtime.InteropServices.ComTypes.FILETIME ft = new System.Runtime.InteropServices.ComTypes.FILETIME();
            int valLow = bytes[0] + 256 * (bytes[1] + 256 * (bytes[2] + 256 * bytes[3]));
            int valTwo = bytes[4] + 256 * (bytes[5] + 256 * (bytes[6] + 256 * bytes[7]));
            ft.dwLowDateTime = valLow;
            ft.dwHighDateTime = valTwo;

            DateTime UTC = DateTime.FromFileTimeUtc((((long) ft.dwHighDateTime) << 32) + ft.dwLowDateTime);
            TimeZoneInfo lcl = TimeZoneInfo.Local;
            TimeZoneInfo utc = TimeZoneInfo.Utc;
            output = TimeZoneInfo.ConvertTime(UTC, utc, lcl);
        }
        return output;
    }

Assuming Windows is shutdown smoothly. It stores it in the registry:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows\ShutdownTime

It is stored as an array of bytes but is a FILETIME.

While there may be a better way, I have used this before and think it works:

    public static DateTime GetLastSystemShutdown()
    {
        string sKey = @"System\CurrentControlSet\Control\Windows";
        Microsoft.Win32.RegistryKey key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(sKey);

        string sValueName = "ShutdownTime";
        object val = key.GetValue(sValueName);

        DateTime output = DateTime.MinValue;
        if (val is byte[] && ((byte[])val).Length == 8)
        {
            byte[] bytes = (byte[])val;

            System.Runtime.InteropServices.ComTypes.FILETIME ft = new System.Runtime.InteropServices.ComTypes.FILETIME();
            int valLow = bytes[0] + 256 * (bytes[1] + 256 * (bytes[2] + 256 * bytes[3]));
            int valTwo = bytes[4] + 256 * (bytes[5] + 256 * (bytes[6] + 256 * bytes[7]));
            ft.dwLowDateTime = valLow;
            ft.dwHighDateTime = valTwo;

            DateTime UTC = DateTime.FromFileTimeUtc((((long) ft.dwHighDateTime) << 32) + ft.dwLowDateTime);
            TimeZoneInfo lcl = TimeZoneInfo.Local;
            TimeZoneInfo utc = TimeZoneInfo.Utc;
            output = TimeZoneInfo.ConvertTime(UTC, utc, lcl);
        }
        return output;
    }
亚希 2024-08-15 15:38:20

可以使用这段代码找到上次重启时间

static void Main(string[] args)
    {          
        TimeSpan t = TimeSpan.FromMilliseconds(System.Environment.TickCount);
        Console.WriteLine( DateTime.Now.Subtract(t));          
    }

Last Restart time can be found using this piece of code

static void Main(string[] args)
    {          
        TimeSpan t = TimeSpan.FromMilliseconds(System.Environment.TickCount);
        Console.WriteLine( DateTime.Now.Subtract(t));          
    }
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