How to get CPU frequency in c#

How can I get in c# the CPU fre开发者_如何学编程quency (example : 2Ghz) ? It's simple but I don't find it in the environnement variables. Thanks :)

 var searcher = new ManagementObjectSearcher(
            "select MaxClockSpeed from Win32_Processor");
 foreach (var item in searcher.Get())
 {
      var clockSpeed = (uint)item["MaxClockSpeed"];
 }

if you wish to get other fields look at class Win32_processor

Try this code

using System.Management;

uint currentsp , Maxsp;
public void CPUSpeed()
{
   using(ManagementObject Mo = new ManagementObject("Win32_Processor.DeviceID='CPU0'"))
   {
       currentsp = (uint)(Mo["CurrentClockSpeed"]);
       Maxsp = (uint)(Mo["MaxClockSpeed"]);
   }
}

If you want to get the turbo speed, you can make use of the "% Processor Performance" performance counter and multiply it with the WMI "MaxClockSpeed" as follows:

private string GetCPUInfo()
{
  PerformanceCounter cpuCounter = new PerformanceCounter("Processor Information", "% Processor Performance", "_Total");
  double cpuValue = cpuCounter.NextValue();

  Thread loop = new Thread(() => InfiniteLoop());
  loop.Start();

  Thread.Sleep(1000);
  cpuValue = cpuCounter.NextValue();
  loop.Abort();

  foreach (ManagementObject obj in new ManagementObjectSearcher("SELECT *, Name FROM Win32_Processor").Get())
  {
    double maxSpeed = Convert.ToDouble(obj["MaxClockSpeed"]) / 1000;
    double turboSpeed = maxSpeed * cpuValue / 100;
    return string.Format("{0} Running at {1:0.00}Ghz, Turbo Speed: {2:0.00}Ghz",  obj["Name"], maxSpeed, turboSpeed);
  }

  return string.Empty;
}

The InfiniteLoop method is simply an integer that gets 1 added and subtracted:

private void InfiniteLoop()
{
  int i = 0;

  while (true)
    i = i + 1 - 1;
}

The InfiniteLoop method is just added to give the CPU something to do and turbo in the process. The loop is allowed to run for a second before the next value is taken and the loop aborted.

One could take the information out of the registry, but dunno if it works on Windows XP or older (mine is Windows 7).

HKEY_LOCAL_MACHINE/HARDWARE/DESCRIPTION/CentralProcessor/0/ProcessorName 

reads like

Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz

for me.

Something like this code could retrieve the information (not tested):

RegistryKey processor_name = Registry.LocalMachine.OpenSubKey(@"Hardware\Description\System\CentralProcessor\0", RegistryKeyPermissionCheck.ReadSubTree);  


if (processor_name != null)
{
  if (processor_name.GetValue("ProcessorNameString") != null)
  {
    string value = processor_name.GetValue("ProcessorNameString");
    string freq = value.Split('@')[1];
    ...
  }
}

(source: here)

You can get it via WMI, but it's quite slow so if you're going to be getting it on more than one occasion I'd suggest you cache it - something like:

namespace Helpers
{
    using System.Management;

    public static class HardwareHelpers
    {
        private static uint? maxCpuSpeed = null;
        public static uint MaxCpuSpeed
        {
            get
            {
                return maxCpuSpeed.HasValue ? maxCpuSpeed.Value : (maxCpuSpeed = GetMaxCpuSpeed()).Value;
            }
        }

        private static uint GetMaxCpuSpeed()
        {
            using (var managementObject = new ManagementObject("Win32_Processor.DeviceID='CPU0'"))
            {
                var sp = (uint)(managementObject["MaxClockSpeed"]);

                return sp;
            }
        }
    }
}