根据进程 ID 获取进程 CPU 占用和内存占用等信息（C#）

PerformanceCounter? cpuCounter = null;
PerformanceCounter? ramCounter = null;
PerformanceCounter? ramCounter2 = null;
// PerformanceCounter? ramCounter3 = null;

var performanceCounterCategory = new PerformanceCounterCategory("Process");
var instanceNames = performanceCounterCategory.GetInstanceNames();
foreach (var instanceName in instanceNames)
{
    try
    {
        var counter = new PerformanceCounter("Process", "ID Process", instanceName, true);
        if (counter.RawValue == Pid)
        {
            cpuCounter = new PerformanceCounter("Process", "% Processor Time", instanceName);
            ramCounter = new PerformanceCounter("Process", "Working Set", instanceName);
            ramCounter2 = new PerformanceCounter("Process", "Private Bytes", instanceName);
            // ramCounter3 = new PerformanceCounter(".NET CLR Memory", "# Gen 2 Collections", instanceName);
            break;
        }
    }
    catch (Exception e)
    {
        continue;
    }
}

if (cpuCounter == null || ramCounter == null || ramCounter2 == null)
{
    return null;
}

var cpu = cpuCounter.NextValue();
var ram = ramCounter.NextValue() / (1024.0 * 1024);
var ram2 = ramCounter2.NextValue() / (1024.0 * 1024);
// var ram3 = ramCounter3.NextValue() / (1024.0 * 1024);