终止进程需要 WQL "SELECT *..."？

Question

我正在编写代码以在指定时间后终止特定进程。我正在使用以下代码（为帖子简化）：

ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT Name, CreationDate FROM Win32_Process WHERE Name = 'foo'"); 

foreach (ManagementObject process in searcher.Get())
{
    process.InvokeMethod("Terminate", null);
}

问题——使用SELECT Name, CreationDate 的 WQL 语句在尝试终止时抛出异常：

"Operation is not valid due to the current state of the object."

...但是，使用SELECT * 可以工作并终止进程。这是为什么 - 结果集中是否需要特定的 WMI 列？

谢谢！

Answer 1

当您执行 WMI 方法时，将执行 WMI 内部搜索 WMI Object path 以识别该方法上的实例。

在这种情况下，对于 Win32_Process WMI 类，WMI 对象路径看起来像 Win32_Process.Handle="8112"，所以正如您所见，Handle 属性是 WMi 对象路径的一部分，并且必须包含在您的 WQL 语句中，

检查此示例。

using System;
using System.Collections.Generic;
using System.Management;
using System.Text;
//this will all the notepad running instances

namespace GetWMI_Info
{
    class Program
    {

        static void Main(string[] args)
        {
            try
            {
                string ComputerName = "localhost";
                ManagementScope Scope;                

                if (!ComputerName.Equals("localhost", StringComparison.OrdinalIgnoreCase)) 
                {
                    ConnectionOptions Conn = new ConnectionOptions();
                    Conn.Username  = "";
                    Conn.Password  = "";
                    Conn.Authority = "ntlmdomain:DOMAIN";
                    Scope = new ManagementScope(String.Format("\\\\{0}\\root\\CIMV2", ComputerName), Conn);
                }
                else
                    Scope = new ManagementScope(String.Format("\\\\{0}\\root\\CIMV2", ComputerName), null);

                Scope.Connect();
                ObjectQuery Query = new ObjectQuery("SELECT Handle FROM Win32_Process Where Name='notepad.exe'");
                ManagementObjectSearcher Searcher = new ManagementObjectSearcher(Scope, Query);

                foreach (ManagementObject WmiObject in Searcher.Get())
                {
                    WmiObject.InvokeMethod("Terminate", null);

                }
            }
            catch (Exception e)
            {
                Console.WriteLine(String.Format("Exception {0} Trace {1}",e.Message,e.StackTrace));
            }
            Console.WriteLine("Press Enter to exit");
            Console.Read();
        }
    }
}