C# 从特定进程(性能计数器)获取 CPU 和 RAM

C# Get CPU and RAM from specific process (performance counters)

我想检索当时前台进程(或特定进程)的 cpu 和 ram 使用情况。
检索窗口的标题不是问题，并且该部分有效。但即使活动窗口以 70% 或更多的 CPU 运行，CPU 显示仍保持在 0%。

(int)pCPU.NextValue(); // <<<< 一直返回 0...

注意：我想用性能计数器来做。我不想使用 Process 变量来执行此操作，因为这可能会引发 \\'insufficient privilege errors\\'。

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[DllImport("user32.dll")]
static extern IntPtr GetForegroundWindow();

[DllImport("user32.dll")]
static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count);

[DllImport("user32.dll")]
public static extern IntPtr GetWindowThreadProcessId(IntPtr hWnd, out uint ProcessId);

public void GetActiveCPUAndRam(out string windowTitle, out int CPUUsagePerc, out int RAMUsage)
{
IntPtr hwnd = GetForegroundWindow();
uint pid;
GetWindowThreadProcessId(hwnd, out pid);

Process activeProc = Process.GetProcessById((int) pid);

#region Window Title

const int nChars = 256;
StringBuilder Buff = new StringBuilder(nChars);
if (GetWindowText(hwnd, Buff, nChars) > 0)
windowTitle = Buff.ToString();
else
{
windowTitle ="";
CPUUsagePerc = 0;
RAMUsage = 0;
return;
}

#endregion

#region RAM/CPU
PerformanceCounter pCPU = new PerformanceCounter("Process","% Processor Time", activeProc.ProcessName, true);
pCPU.NextValue();
CPUUsagePerc = (int)pCPU.NextValue(); // <<<<< problem here.

RAMUsage = 0; // TODO:

#endregion
}

编辑：
我尝试了新的解决方案：
但是当我运行一个 cpu 压力测试程序将 cpu 使用率推到 100% (single core) 时。然后下面的解决方案显示该进程的cpu使用率就像总cpu的300-400％......显然还是有问题。

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private PerformanceCounter pCPU = null;
private IntPtr PreviousProcHwnd = IntPtr.Zero;
private CounterSample PreviousCPUCounterSample = CounterSample.Empty;

public void GetActiveCPUAndRam(out string windowTitle, out int CPUUsagePerc, out int RAMUsage)
{
...
#region RAM/CPU

if (PreviousProcHwnd != hwnd)
{
PreviousProcHwnd = hwnd;
pCPU = new PerformanceCounter("Process","% Processor Time", activeProc.ProcessName,
true);
PreviousCPUCounterSample = CounterSample.Empty;
}

CounterSample sample1 = pCPU.NextSample();
CPUUsagePerc = (int)CounterSample.Calculate(PreviousCPUCounterSample, sample1);
PreviousCPUCounterSample = sample1;
RAMUsage = 0; // TODO:

#endregion
}