CPU使用率与任务管理器，PerformanceCounter或ManagementObjectSearcher不匹配

我只是想获得与任务管理器匹配的准确CPU使用率。到目前为止，我已经尝试了四种不起作用的推荐方法。CPU使用率与任务管理器，PerformanceCounter或ManagementObjectSearcher不匹配

首先，我尝试了类似的解决方案或建议，我可以找到。此处的代码示例使用四种方法，所有这些方法都不准确。其次，我知道任务管理器波动并取决于何时采样。这仍然没有解决差异。最后，我知道有不同的方法，而且任务管理器只使用一种方法。由于这是针对一般用户的，因此它需要接近任务管理器。

public partial class MainWindow : Window 
{ 
    //*** Method 1 & 2 
    PerformanceCounter cpuCounterPi = new PerformanceCounter("Processor Information", "% Processor Time", "_Total"); 
    PerformanceCounter cpuCounterP = new PerformanceCounter("Processor", "% Processor Time", "_Total"); 

    //*** method 3 
    ManagementObjectSearcher query1 = new ManagementObjectSearcher("select loadpercentage from win32_processor"); 

    //*** Mixed method usage below 
    CounterSample csPi1, csPi2, csP1, csP2; 
    double cpuPercentagePi, cpuPercentageP, cpuPercentageLoad; 
    int count = -1; 
    Boolean alternate = false; 

    System.Windows.Threading.DispatcherTimer dispatcherTimer = new System.Windows.Threading.DispatcherTimer(); 

    public MainWindow() 
    { 
     InitializeComponent(); 

     dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick); 
     dispatcherTimer.Interval = new TimeSpan(0, 0, 5); 
     dispatcherTimer.Start(); 
    } 

    private void dispatcherTimer_Tick(object sender, EventArgs e) 
    { 
     count++; 
     //***Method 1 & 2 
     if (alternate) 
     { 
      csPi1 = cpuCounterPi.NextSample(); 
      cpuPercentagePi = CounterSample.Calculate(csPi2, csPi1); 
      csP1 = cpuCounterP.NextSample(); 
      cpuPercentageP = CounterSample.Calculate(csP2, csP1); 

     } 
     else 
     { 
      csPi2 = cpuCounterPi.NextSample(); 
      cpuPercentagePi = CounterSample.Calculate(csPi1, csPi2); 
      csP2 = cpuCounterP.NextSample(); 
      cpuPercentageP = CounterSample.Calculate(csP1, csP2); 
     } 
     alternate = !alternate; 

     if (count==5) { textBox.Clear(); count = 0; } 
     textBox.Text = textBox.Text + "\nProcessor Information (Method 1)   " + cpuPercentagePi.ToString(); 
     textBox.Text = textBox.Text + "\nProcessor (Method 2)       " + cpuPercentageP.ToString(); 
     textBox.Text = textBox.Text + "\nProcessor ½ (Method 2 divided by 2) " + (cpuPercentageP/2).ToString(); 
     //***** Method 3 **** 
     ManagementObjectCollection cpuColl = query1.Get(); 
     foreach (ManagementObject mo in cpuColl) 
     { 
      cpuPercentageLoad = Convert.ToDouble(mo["loadpercentage"]); 
     } 
     textBox.Text = textBox.Text + "\nProcessor Load (Method 3)    " + cpuPercentageLoad.ToString() + "\n"; 

    }

这里有两个样本与任务管理器比较。