如何在C#中找到CPU核心数？

class Program{
   public static void Main(){
      foreach (var item in new
      System.Management.ManagementObjectSearcher("Select * from
      Win32_ComputerSystem").Get()){
         Console.WriteLine("Number Of Physical Processors: {0} ",
         item["NumberOfProcessors"]);
      }
      Console.ReadLine();
   }
}

Number Of Physical Processors: 1

class Program{
   public static void Main(){
      int coreCount = 0;
      foreach (var item in new
      System.Management.ManagementObjectSearcher("Select * from
      Win32_Processor").Get()){
         coreCount += int.Parse(item["NumberOfCores"].ToString());
      }
      Console.WriteLine("Number Of Cores: {0}", coreCount);
      Console.ReadLine();
   }
}

Number Of Cores: 2

class Program{
   public static void Main(){
      Console.WriteLine("Number Of Logical Processors: {0}",
      Environment.ProcessorCount);
      Console.ReadLine();
   }
}

Number Of Logical Processors: 4