终止进程需要WQL "SELECT *...“吗？

Question

我正在编写代码，以便在指定的时间后终止特定的进程。我使用下面的代码(为post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--在尝试终止时，使用SELECT Name, CreationDate的wql语句会抛出异常：

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

使用SELECT *的...but会工作并终止该进程。为什么会这样--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，以供WMI Object path识别该方法上的实例。

在本例中，对于WQL类，Win32_Process对象路径类似于Win32_Process.Handle="8112"，因此正如您所看到的，Handle属性是WQL对象路径的一部分，并且必须包含在您的WQL语句中，

请检查此示例。

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();
        }
    }
}