有没有一种简单的方法可以使用C#获得系统的正常运行时间?
public TimeSpan UpTime {
get {
using (var uptime = new PerformanceCounter("System", "System Up Time")) {
uptime.NextValue(); //Call this an extra time before reading its value
return TimeSpan.FromSeconds(uptime.NextValue());
}
}
}
我有点迟了,但另一个简单的方法是使用GetTickCount64函数,该函数从Windows Vista开始可用,并且不会像GetTickCount那样溢出:
public static TimeSpan GetUpTime()
{
return TimeSpan.FromMilliseconds(GetTickCount64());
}
[DllImport("kernel32")]
extern static UInt64 GetTickCount64();
System.Environment.TickCount获取自系统重启以来的毫秒数。
请注意,它是一个Int32,并将在24.9天后溢出并将变为负数。请参阅MDSN文档上的备注。
根据任务经理的说法,我的机器的正常运行时间为58 days 17 hours
。我经历过并尝试了每个答案,快速的一点点关闭(约1-3分钟,但超过58天的正常运行时间):
Stopwatch.GetTimeStamp(): 58days 17hours 11minutes 25seconds
~Time to calculate (ms): 6.8413
DllImport GetTickCount64(): 58days 17hours 13minutes 34seconds
~Time to calculate (ms): 0.2192
PerformanceCounter(System, System Up Time): 58days 17hours 14minutes 02seconds
~Time to calculate (ms): 1233.2854
ManagementObject LastBootUpTime: 58days 17hours 14minutes 02seconds
~Time to calculate (ms): 30.0283
最后两个,使用PerformanceCounter或使用ManagementObject,始终与Windows任务管理器在同一秒内(只需要接受我的话,或者使用下面的代码自己尝试)。根据结果,我将使用ManagementObject LastBootUpTime
方法,因为它比PerformanceCounter
快得多,但与任务管理器相比仍然完全准确。
请注意,我确实在打印时间之前减去了每个方法的当前经过时间,但是整个过程运行时间不到2秒,因此无论如何都不能通过不正确地计算执行时间来解释时移。这是我使用的代码:
[System.Runtime.InteropServices.DllImport("kernel32")]
extern static UInt64 GetTickCount64();
public static void Main()
{
var start = Stopwatch.StartNew();
var eachStart = Stopwatch.StartNew();
var ticks = Stopwatch.GetTimestamp();
var uptime = ((double)ticks) / Stopwatch.Frequency;
var uptimeTimeSpan = TimeSpan.FromSeconds(uptime);
Console.WriteLine("Stopwatch.GetTimeStamp(): " + uptimeTimeSpan.Subtract(start.Elapsed).ToString(@"dd\d\a\y\s\ hh\h\o\u\r\s\ mm\m\i\n\u\t\e\s\ ss\s\e\c\o\n\d\s"));
Console.WriteLine($"~Time to calculate (ms): {eachStart.Elapsed.TotalMilliseconds}");
eachStart.Restart();
Console.WriteLine("DllImport GetTickCount64(): " + TimeSpan.FromMilliseconds(GetTickCount64()).Subtract(start.Elapsed).ToString(@"dd\d\a\y\s\ hh\h\o\u\r\s\ mm\m\i\n\u\t\e\s\ ss\s\e\c\o\n\d\s"));
Console.WriteLine($"~Time to calculate (ms): {eachStart.Elapsed.TotalMilliseconds}");
eachStart.Restart();
var upTime = new PerformanceCounter("System", "System Up Time");
upTime.NextValue(); //Call this an extra time before reading its value
Console.WriteLine("PerformanceCounter(System, System Up Time): " + TimeSpan.FromSeconds(upTime.NextValue()).Subtract(start.Elapsed).ToString(@"dd\d\a\y\s\ hh\h\o\u\r\s\ mm\m\i\n\u\t\e\s\ ss\s\e\c\o\n\d\s"));
Console.WriteLine($"~Time to calculate (ms): {eachStart.Elapsed.TotalMilliseconds}");
eachStart.Restart();
ManagementObject mo = new ManagementObject(@"\\.\root\cimv2:Win32_OperatingSystem=@");
DateTime lastBootUp = ManagementDateTimeConverter.ToDateTime(mo["LastBootUpTime"].ToString());
Console.WriteLine("ManagementObject LastBootUpTime: " + (DateTime.Now.ToUniversalTime() - lastBootUp.ToUniversalTime()).Subtract(start.Elapsed).ToString(@"dd\d\a\y\s\ hh\h\o\u\r\s\ mm\m\i\n\u\t\e\s\ ss\s\e\c\o\n\d\s"));
Console.WriteLine($"~Time to calculate (ms): {eachStart.Elapsed.TotalMilliseconds}");
}
精确和大于System.Environment.TickCount
,不涉及操作系统可怕的性能计数器,WMI或本机调用:
var ticks = Stopwatch.GetTimestamp();
var uptime = ((double)ticks) / Stopwatch.Frequency;
var uptimeSpan = TimeSpan.FromSeconds(uptime);
最简单和正确的方法是
public static TimeSpan GetUptime()
{
ManagementObject mo = new ManagementObject(@"\\.\root\cimv2:Win32_OperatingSystem=@");
DateTime lastBootUp = ManagementDateTimeConverter.ToDateTime(mo["LastBootUpTime"].ToString());
return DateTime.Now.ToUniversalTime() - lastBootUp.ToUniversalTime();
}
简单,不,但可以做到:
static DateTime getLastBootTime(ManagementObject mObject)
{
PropertyData pd = mObject.Properties["LastBootUpTime"];
string name = pd.Name.ToString();
DateTime lastBoot = parseCmiDateTime(pd.Value.ToString());
return lastBoot;
}
static ManagementObject getServerOSObject(string serverName)
{
ManagementObjectSearcher mSearcher = new ManagementObjectSearcher("Select * From Win32_OperatingSystem");
mSearcher.Scope = new ManagementScope(String.Format(@"\\{0}\root\cimv2", serverName));
ManagementObjectCollection mObjects = mSearcher.Get();
if (mObjects.Count != 1) throw new Exception(String.Format("Expected 1 object, returned {0}.", mObjects.Count));
foreach (ManagementObject m in mObjects)
{
//No indexing on collection
return m;
}
throw new Exception("Something went wrong!");
}
我知道问题既旧又解决了,但我能说的最简单的解决方案就是使用Enviroment.TickCount属性,该属性返回自系统启动以来的毫秒数:
System.DateTime SystemStartTime = DateAndTime.Now.AddMilliseconds(-Environment.TickCount);
System.DateTime Uptime = DateAndTime.Now - SystemStartTime;
此解决方案比接受的答案快得多。