对于那些仍然无法获得与任务管理器匹配的CPU使用总数的人，您应该使用以下语句:

new PerformanceCounter("Processor Information", "% Processor Utility", "_Total");

我不喜欢在所有的PerformanceCounter解决方案中添加1秒的停顿。相反，我选择使用WMI解决方案。1秒等待/失速存在的原因是允许在使用PerformanceCounter时读取准确。然而，如果你经常调用这个方法并刷新这个信息，我建议不要经常产生这种延迟…即使考虑做一个异步进程来获得它。

我从这里的代码片段开始，使用c#返回WMI中的CPU使用情况，并在下面的博客文章中添加了解决方案的完整解释:

在c#中使用WMI获取所有核心的CPU使用情况

对于那些仍然无法获得与任务管理器匹配的CPU使用总数的人，您应该使用以下语句:

new PerformanceCounter("Processor Information", "% Processor Utility", "_Total");

您可以使用System.Diagnostics中的PerformanceCounter类。

像这样初始化:

PerformanceCounter cpuCounter;
PerformanceCounter ramCounter;

cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total");
ramCounter = new PerformanceCounter("Memory", "Available MBytes");

这样消费:

public string getCurrentCpuUsage(){
            return cpuCounter.NextValue()+"%";
}

public string getAvailableRAM(){
            return ramCounter.NextValue()+"MB";
} 

这个类每1秒自动轮询一次计数器，也是线程安全的:

public class ProcessorUsage
{
    const float sampleFrequencyMillis = 1000;

    protected object syncLock = new object();
    protected PerformanceCounter counter;
    protected float lastSample;
    protected DateTime lastSampleTime;

    /// <summary>
    /// 
    /// </summary>
    public ProcessorUsage()
    {
        this.counter = new PerformanceCounter("Processor", "% Processor Time", "_Total", true);
    }

    /// <summary>
    /// 
    /// </summary>
    /// <returns></returns>
    public float GetCurrentValue()
    {
        if ((DateTime.UtcNow - lastSampleTime).TotalMilliseconds > sampleFrequencyMillis)
        {
            lock (syncLock)
            {
                if ((DateTime.UtcNow - lastSampleTime).TotalMilliseconds > sampleFrequencyMillis)
                {
                    lastSample = counter.NextValue();
                    lastSampleTime = DateTime.UtcNow;
                }
            }
        }

        return lastSample;
    }
}

没事的，我知道了!谢谢你的帮助!

下面是代码:

private void button1_Click(object sender, EventArgs e)
{
    selectedServer = "JS000943";
    listBox1.Items.Add(GetProcessorIdleTime(selectedServer).ToString());
}

private static int GetProcessorIdleTime(string selectedServer)
{
    try
    {
        var searcher = new
           ManagementObjectSearcher
             (@"\\"+ selectedServer +@"\root\CIMV2",
              "SELECT * FROM Win32_PerfFormattedData_PerfOS_Processor WHERE Name=\"_Total\"");

        ManagementObjectCollection collection = searcher.Get();
        ManagementObject queryObj = collection.Cast<ManagementObject>().First();

        return Convert.ToInt32(queryObj["PercentIdleTime"]);
    }
    catch (ManagementException e)
    {
        MessageBox.Show("An error occurred while querying for WMI data: " + e.Message);
    }
    return -1;
}