blocks|key|79318|text|可以使用System.Diagnostics.Eventing.Reader中的类访问系统事件日志。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|79319|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.diagnostics.eventing.reader%2528VS.90%2529.aspx^0|4|Y|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You can use the classes in <a href="http://msdn.microsoft.com/en-us/library/system.diagnostics.eventing.reader%28VS.90%29.aspx" rel="nofollow">System.Diagnostics.Eventing.Reader</a> to access the system Event Logs.

blocks|key|27682|text|根据这篇文章，您可以使用WMI获取上一次引导日期/时间。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|27683|//+define+a+select+query
SelectQuery+query+=
++++new+SelectQuery(@"SELECT+LastBootUpTime+FROM+Win32_OperatingSystem
+++++++WHERE+Primary='true'");

//+create+a+new+management+object+searcher+and+pass+it
//+the+select+query
ManagementObjectSearcher+searcher+=
++++new+ManagementObjectSearcher(query);

//+get+the+datetime+value+and+set+the+local+boot
//+time+variable+to+contain+that+value
foreach(ManagementObject+mo+in+searcher.Get())
{
++++dtBootTime+=
++++++++ManagementDateTimeConverter.ToDateTime(
++++++++++++mo.Properties["LastBootUpTime"].Value.ToString());

++++//+display+the+start+time+and+date
++++txtDate.Text+=+dtBootTime.ToLongDateString();
++++txtTime.Text+=+dtBootTime.ToLongTimeString();
}|code-block|syntax|javascript|27684|entityMap|0|LINK|mutability|MUTABLE|url|http://web.archive.org/web/20111104234407/http://www.c-sharpcorner.com/UploadFile/scottlysle/TimeSinceBootCS06052008055807AM/TimeSinceBootCS.aspx^0|H|A|2|4|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

According to <a href="http://web.archive.org/web/20111104234407/http://www.c-sharpcorner.com/UploadFile/scottlysle/TimeSinceBootCS06052008055807AM/TimeSinceBootCS.aspx" rel="noreferrer">this article</a> you can use WMI to get the last boot date/time.

<pre><code>// define a select query
SelectQuery query =
 new SelectQuery(@"SELECT LastBootUpTime FROM Win32_OperatingSystem
 WHERE Primary='true'");

// create a new management object searcher and pass it
// the select query
ManagementObjectSearcher searcher =
 new ManagementObjectSearcher(query);

// get the datetime value and set the local boot
// time variable to contain that value
foreach(ManagementObject mo in searcher.Get())
{
 dtBootTime =
 ManagementDateTimeConverter.ToDateTime(
 mo.Properties["LastBootUpTime"].Value.ToString());

 // display the start time and date
 txtDate.Text = dtBootTime.ToLongDateString();
 txtTime.Text = dtBootTime.ToLongTimeString();
}
</code></pre>

blocks|key|79447|text|System.Environment.TickCount有24.8天的限制。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|79448|这是因为TickCount是一个毫秒值，包含在一个签名的32位值中。|79449|Windows+API公开了这两个函数：|79450|GetTickCount+-返回来自Windows2000的32位值|79451|GetTickCount64+-返回64位值-可从Vista/Windows+2008获得|79452|您可以这样使用GetTickCount64：|79453|using+System.Runtime.InteropServices;++

[DllImport("Kernel32.dll")]++
static+extern+long+GetTickCount64();++

DateTime+osStartTime+=+DateTime.Now+-+new+TimeSpan(10000+*+GetTickCount64());|code-block|syntax|javascript|79454|entityMap^0|0|S|0|4|9|0|0|0|C|0|0|E|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|12|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|19|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|1A|8|@]|D|@]|E|$S|T]]|$1|U|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|V|$]]

<code>System.Environment.TickCount</code> has a 24.8 days limitation. 
This is because <code>TickCount</code> is a millisecond value contained in a signed 32 bits value. 

Windows API exposes these two functions: 
<code>GetTickCount</code> - returns a 32 bits value - available from Windows 2000 
<code>GetTickCount64</code> - returns a 64 bits value - available from Vista/Windows Server 2008 

You can use GetTickCount64 this way: 

<pre><code>using System.Runtime.InteropServices; 

[DllImport("Kernel32.dll")] 
static extern long GetTickCount64(); 

DateTime osStartTime = DateTime.Now - new TimeSpan(10000 * GetTickCount64());
</code></pre>

blocks|key|79381|text|正如Reed指出的，您可以访问事件日志并查看它们是何时创建的。AFAIK没有用于系统启动/关闭的特定事件条目，但您可以查找通常使用Windows启动/停止的服务。虽然使用这种方法意味着它不会100%25准确，例如，如果它崩溃或者是手动启动/停止/重新启动。我认为最准确的事件之一是EventLog服务启动/停止事件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|79382|if+(EventLog.Exists("System"))
{
++++var+log+=+new+EventLog("System",+Environment.MachineName,+"EventLog");

++++var+entries+=+new+EventLogEntry[log.Entries.Count];
++++log.Entries.CopyTo(entries,+0);

++++var+startupTimes+=+entries.Where(x+=>+x.InstanceId+==+2147489653).Select(x+=>+x.TimeGenerated);
++++var+shutdownTimes+=+entries.Where(x+=>+x.InstanceId+==+2147489654).Select(x+=>+x.TimeGenerated);
}|code-block|syntax|javascript|79383|编辑|offset|length|style|BOLD|79384|结果发现有一个关机事件。您可以替换Linq以获得它：|79385|var+shutdownEvents+=+entries.Where(x+=>+x.InstanceId+==+2147484722);|79386|entityMap^0|0|0|0|2|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

As Reed pointed out you could access the Event Logs and see when they were created. AFAIK there are no specific event entries for system startup/shutdown, but you could look for services that are usually started/stopped with Windows. Though using this approach means it won't be 100% accurate, say if it crashes or it's manually started/stopped/restarted. One event I consider is the most accurate is EventLog service start/stop event.

<pre class="lang-cs prettyprint-override"><code>if (EventLog.Exists("System"))
{
 var log = new EventLog("System", Environment.MachineName, "EventLog");

 var entries = new EventLogEntry[log.Entries.Count];
 log.Entries.CopyTo(entries, 0);

 var startupTimes = entries.Where(x =&gt; x.InstanceId == 2147489653).Select(x =&gt; x.TimeGenerated);
 var shutdownTimes = entries.Where(x =&gt; x.InstanceId == 2147489654).Select(x =&gt; x.TimeGenerated);
}
</code></pre>

Edit

Turns out there was a shutdown event. You can replace the Linq to get it:

<pre class="lang-cs prettyprint-override"><code>var shutdownEvents = entries.Where(x =&gt; x.InstanceId == 2147484722);
</code></pre>

blocks|key|27109|text|您可以使用“系统启动时间”性能计数器来获取系统的启动时间：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|27110|+PerformanceCounter+systemUpTime+=+new+PerformanceCounter("System",+"System+Up+Time");

+systemUpTime.NextValue();
+TimeSpan+upTimeSpan+=+TimeSpan.FromSeconds(systemUpTime.NextValue());
+Console.Out.WriteLine(DateTime.Now.Subtract(upTimeSpan).ToShortTimeString());|code-block|syntax|javascript|27111|希望这个能帮上忙。|27112|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You could use the "System Up Time" performance counter to get the start time of the
system:

<pre><code> PerformanceCounter systemUpTime = new PerformanceCounter("System", "System Up Time");

 systemUpTime.NextValue();
 TimeSpan upTimeSpan = TimeSpan.FromSeconds(systemUpTime.NextValue());
 Console.Out.WriteLine(DateTime.Now.Subtract(upTimeSpan).ToShortTimeString());
</code></pre>

Hope, this helps.

blocks|key|27129|text|使用这段代码可以找到最后重新启动的时间。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|27130|static+void+Main(string[]+args)
++++{++++++++++
++++++++TimeSpan+t+=+TimeSpan.FromMilliseconds(System.Environment.TickCount);
++++++++Console.WriteLine(+DateTime.Now.Subtract(t));++++++++++
++++}|code-block|syntax|javascript|27131|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Last Restart time can be found using this piece of code 

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

blocks|key|1904686|text|一些更多的选择：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1904687|使用.NET获取上一次windows关闭事件的日期时间。|unordered-list-item|offset|length|1904688|http://www.codeproject.com/KB/cs/GetLastRebootTime.aspx|1904689|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/q/1631933/847363|1^0|0|0|S|0|0|0|1J|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@$E|T|F|U|1|V]]|A|$]]|$1|G|3|H|5|D|7|W|8|@]|9|@$E|X|F|Y|1|Z]]|A|$]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]|Q|$5|L|M|N|A|$O|H]]]]

Some more options: 

<ul>
<li><a href="https://stackoverflow.com/q/1631933/847363">Get the date-time of last windows shutdown event using .NET</a></li>
<li><a href="http://www.codeproject.com/KB/cs/GetLastRebootTime.aspx" rel="nofollow noreferrer">http://www.codeproject.com/KB/cs/GetLastRebootTime.aspx</a></li>
</ul>

blocks|key|27777|text|下面是可以执行的收集的代码，包括上面的代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|27778|这是用通常被执行的.NET+4.6.1编写的。|27779|您可以选择任何方法：|27780|using+System;
using+System.Linq;
using+System.Diagnostics;
using+System.Management;

namespace+ConsoleEventLogSample1
{
++++class+Program
++++{
++++++++static+void+Main(string[]+args)
++++++++{
++++++++++++if+(args+is+null)+throw+new+ArgumentNullException(nameof(args));


++++++++++++//+EventLog
++++++++++++Console.WriteLine($"EventLog+=+Last+shutdown+time+:+"+%2B
++++++++++++++++$"{GetSystemLastTimeByEventLog(false):yyyy-MM-dd+HH:MM:ss},+"+%2B
++++++++++++++++$"Last+startup+time+:+{GetSystemLastTimeByEventLog(true):yyyy-MM-dd+HH:MM:ss}");+//+ms(fff)+is+not+displayed

++++++++++++//+Registry
++++++++++++Console.WriteLine($"Registry+=+Last+shutdown+time+:+"+%2B
++++++++++++++++$"{GetSystemLastShutdownTimeByRegistry():yyyy-MM-dd+HH:MM:ss.fff}");

++++++++++++//+WMI
++++++++++++Console.WriteLine($"WMI+=+Last+startup+time+:+"+%2B
++++++++++++++++$"{GetSystemLastStartupTimeByWMI():yyyy-MM-dd+HH:MM:ss.fff}");

++++++++++++Console.ReadLine();
++++++++}

++++++++static+DateTime+GetSystemLastTimeByEventLog(bool+direction)
++++++++{
++++++++++++//+Do+not+check+for+presence+or+not+:+Items+that+must+exist
++++++++++++var+log+=+new+EventLog("System",+Environment.MachineName,+"EventLog");

++++++++++++var+entries+=+new+EventLogEntry[log.Entries.Count];
++++++++++++log.Entries.CopyTo(entries,+0);

++++++++++++if+(direction)
++++++++++++{
++++++++++++++++return+entries.Where(x+=>+x.InstanceId+==+2147489653).Select(x+=>+x.TimeGenerated).Last();
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++return+entries.Where(x+=>+x.InstanceId+==+2147489654+%7C%7C+x.InstanceId+==+2147489656).Select(x+=>+x.TimeGenerated).Last();
++++++++++++}
++++++++}

++++++++static+DateTime+GetSystemLastShutdownTimeByRegistry()
++++++++{
++++++++++++//+Do+not+check+for+presence+or+not+:+Items+that+must+exist
++++++++++++string+sKey+=+@"System\CurrentControlSet\Control\Windows";
++++++++++++using+(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);
++++++++++++}
++++++++}

++++++++static+DateTime+GetSystemLastStartupTimeByWMI()
++++++++{
++++++++++++//+Do+not+check+for+presence+or+not+:+Items+that+must+exist
++++++++++++SelectQuery+query+=+new+SelectQuery(@"select+LastBootUpTime+from+Win32_OperatingSystem+where+Primary='true'");

++++++++++++ManagementObjectSearcher+searcher+=+new+ManagementObjectSearcher(query);
++++++++++++DateTime+lastdt+=+new+DateTime();

++++++++++++foreach+(ManagementObject+mo+in+searcher.Get())
++++++++++++{
++++++++++++++++lastdt+=+ManagementDateTimeConverter.ToDateTime(mo.Properties["LastBootUpTime"].Value.ToString());
++++++++++++++++break;
++++++++++++}

++++++++++++return+lastdt;
++++++++}

++++}
}|code-block|syntax|javascript|27781|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Here is a collected code that can be executed, including the code above.
This was written in .NET 4.6.1, which is usually executed.
You can choose any method :
<pre><code>using System;
using System.Linq;
using System.Diagnostics;
using System.Management;

namespace ConsoleEventLogSample1
{
 class Program
 {
 static void Main(string[] args)
 {
 if (args is null) throw new ArgumentNullException(nameof(args));


 // EventLog
 Console.WriteLine($&quot;EventLog = Last shutdown time : &quot; +
 $&quot;{GetSystemLastTimeByEventLog(false):yyyy-MM-dd HH:MM:ss}, &quot; +
 $&quot;Last startup time : {GetSystemLastTimeByEventLog(true):yyyy-MM-dd HH:MM:ss}&quot;); // ms(fff) is not displayed

 // Registry
 Console.WriteLine($&quot;Registry = Last shutdown time : &quot; +
 $&quot;{GetSystemLastShutdownTimeByRegistry():yyyy-MM-dd HH:MM:ss.fff}&quot;);

 // WMI
 Console.WriteLine($&quot;WMI = Last startup time : &quot; +
 $&quot;{GetSystemLastStartupTimeByWMI():yyyy-MM-dd HH:MM:ss.fff}&quot;);

 Console.ReadLine();
 }

 static DateTime GetSystemLastTimeByEventLog(bool direction)
 {
 // Do not check for presence or not : Items that must exist
 var log = new EventLog(&quot;System&quot;, Environment.MachineName, &quot;EventLog&quot;);

 var entries = new EventLogEntry[log.Entries.Count];
 log.Entries.CopyTo(entries, 0);

 if (direction)
 {
 return entries.Where(x =&gt; x.InstanceId == 2147489653).Select(x =&gt; x.TimeGenerated).Last();
 }
 else
 {
 return entries.Where(x =&gt; x.InstanceId == 2147489654 || x.InstanceId == 2147489656).Select(x =&gt; x.TimeGenerated).Last();
 }
 }

 static DateTime GetSystemLastShutdownTimeByRegistry()
 {
 // Do not check for presence or not : Items that must exist
 string sKey = @&quot;System\CurrentControlSet\Control\Windows&quot;;
 using (Microsoft.Win32.RegistryKey key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(sKey))
 {
 string sValueName = &quot;ShutdownTime&quot;;
 byte[] val = (byte[])key.GetValue(sValueName);
 long valueAsLong = BitConverter.ToInt64(val, 0);
 return DateTime.FromFileTime(valueAsLong);
 }
 }

 static DateTime GetSystemLastStartupTimeByWMI()
 {
 // Do not check for presence or not : Items that must exist
 SelectQuery query = new SelectQuery(@&quot;select LastBootUpTime from Win32_OperatingSystem where Primary='true'&quot;);

 ManagementObjectSearcher searcher = new ManagementObjectSearcher(query);
 DateTime lastdt = new DateTime();

 foreach (ManagementObject mo in searcher.Get())
 {
 lastdt = ManagementDateTimeConverter.ToDateTime(mo.Properties[&quot;LastBootUpTime&quot;].Value.ToString());
 break;
 }

 return lastdt;
 }

 }
}
</code></pre>

blocks|key|1904809|text|在.NET+5和.NET+Core+3中，您可以使用Environment.TickCount64属性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1904810|var+t+=+TimeSpan.FromMilliseconds(Environment.TickCount64);
var+lastBootTime+=+DateTime.UtcNow.Subtract(t);
Console.WriteLine(lastBootTime);|code-block|syntax|javascript|1904811|entityMap|0|LINK|mutability|MUTABLE|url|https://learn.microsoft.com/en-us/dotnet/api/system.environment.tickcount64?view=net-5.0^0|1|6|8|B|Q|N|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

In <code>.NET 5</code> and <code>.NET Core 3</code>, you can use the <a href="https://learn.microsoft.com/en-us/dotnet/api/system.environment.tickcount64?view=net-5.0" rel="nofollow noreferrer">Environment.TickCount64</a> property.
<pre class="lang-cs prettyprint-override"><code>var t = TimeSpan.FromMilliseconds(Environment.TickCount64);
var lastBootTime = DateTime.UtcNow.Subtract(t);
Console.WriteLine(lastBootTime);
</code></pre>

I need to develop a program in C# find out when was Windows started or shutdown. 

Is there a log file that I can read to know Windows start and shutdown times? Or do you have any ideas how to do so?

EDIT :

With the help of Mr. Reed Copsey, the best answer is found under this <a href="https://stackoverflow.com/questions/6185608/getting-server-restart-count-in-a-day-using-c">question</a>.

How to know when was Windows started or shutdown?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我需要在C#中开发一个程序，找出Windows什么时候启动或关闭。是否有我可以读取的日志文件来了解Windows的启动和关闭时间？或者你有什么办法吗？编辑:在里德·科普西先生的帮助下，最好的答案是在这个下面。

问如何知道Windows何时启动或关闭？
EN

回答 9

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

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问如何知道Windows何时启动或关闭？EN

回答 9

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何知道Windows何时启动或关闭？
EN