Powershell SDK 访问 Powershell 对象的值？

Question

大家好，我是 C# 和 .NET 编程新手。 我正在尝试使用 powershell 脚本并制作一个执行类似功能的代理。代理正确编译和安装，并将 powershell 命令的输出记录到日志文件中。 问题是我没有访问这些值，而是日志打印出对象？ 我如何访问这些值？提前致谢，并对我的初步尝试保持温和。

我对我一直在使用的文档的参考： https://learn.microsoft.com/en-us/dotnet/api/system.management.automation.powershell?view=powershellsdk-7.4.0

日志文件输出： 执行时间：10/2/2024 3:49:45 PM 启动带宽陷阱...System.Collections.ObjectModel.Collection`1[System.Management.Automation.PSObject]

代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.Threading.Tasks;
using System.Timers;
using System.Management.Automation;

namespace SBC_Agent
{
     public partial class Service1 : ServiceBase
     {
          Timer timer = new Timer(); // name space(using System.Timers;)
          private Timer _audittimer;
          private string auditFilePath = AppDomain.CurrentDomain.BaseDirectory + "\\Logs\\Audit";

          public Service1()
          {
               InitializeComponent();
          }
          protected override void OnStart(string[] args)
          {
               WriteToFile("Service is started at " + DateTime.Now);
               timer.Elapsed += new ElapsedEventHandler(OnElapsedTime);
               timer.Interval = 5000; //number in milliseconds
               timer.Enabled = true;

               _audittimer = new Timer();
               _audittimer.Interval = 60000;
               _audittimer.Elapsed += new ElapsedEventHandler(OnElapsedAuditTime);
               _audittimer.Enabled = true;

               Directory.CreateDirectory(Path.GetDirectoryName(auditFilePath));
          }
          private void OnElapsedAuditTime(object source, ElapsedEventArgs e)
          {
               RunPowerShellCommands();
          }

          private void BandwidthTrap()
          {
               try
               {
                    using (System.Management.Automation.PowerShell psInstance = System.Management.Automation.PowerShell.Create())
                    {
                         //psInstance.AddScript("Get-WmiObject -Class win32_ip4routetable | where {$_.destination -eq \"0.0.0.0\"} | select -ExpandProperty InterfaceIndex | select -First 1");
                         psInstance.AddScript("Get-WmiObject -Class win32_ip4routetable");
                         var int_index = psInstance.Invoke();
                         //var ifIndex = "InterfaceIndex=" + int_index;
                         using (StreamWriter writer = new StreamWriter(auditFilePath, true))
                         {
                              writer.WriteLine("Execution Time: " + DateTime.Now.ToString() + " Launched Bandwidth Trap..." + int_ndex);
                         }
                    }
               }
               catch (Exception ex)
               {
                    EventLog.WriteEntry("Powershell Service Error: " + ex.Message, EventLogEntryType.Error);
                    using (StreamWriter writer = new StreamWriter(auditFilePath, true))
                    {
                         writer.WriteLine("Error: " + ex.Message);
                         writer.WriteLine("StackTrace: " + ex.StackTrace);
                    }
               }      
          }
          private void RunPowerShellCommands()
          {
               try
               {

                    BandwidthTrap();
                    /*
                    using (System.Management.Automation.PowerShell psInstance = System.Management.Automation.PowerShell.Create())
                    {
                         psInstance.AddScript("Get-Process");
                         var results = psInstance.Invoke();
                         using (StreamWriter writer = new StreamWriter(auditFilePath, true))
                         {
                              writer.WriteLine("Execution Time: " + DateTime.Now.ToString());
                              foreach (var result in results)
                              {
                                   writer.WriteLine(result.ToString());
                              }
                              writer.WriteLine();
                         }
                    }
                    */
               }
               catch (Exception ex) 
               {
                    EventLog.WriteEntry("Powershell Service Error: " + ex.Message, EventLogEntryType.Error);
                    using (StreamWriter writer = new StreamWriter(auditFilePath, true))
                    {
                         writer.WriteLine("Error: " + ex.Message);
                         writer.WriteLine("StackTrace: " + ex.StackTrace);
                    }
               }
               
          }
          protected override void OnStop()
          {
               WriteToFile("Service is stopped at " + DateTime.Now);
          }
          private void OnElapsedTime(object source, ElapsedEventArgs e)
          {
               WriteToFile("Service is recall at " + DateTime.Now);
          }
          public void WriteToFile(string Message)
          {
               string path = AppDomain.CurrentDomain.BaseDirectory + "\\Logs";
               if (!Directory.Exists(path)) 
               {
                    Directory.CreateDirectory(path);
               }
               string filepath = AppDomain.CurrentDomain.BaseDirectory + "\\Logs\\ServiceLog_" + DateTime.Now.Date.ToShortDateString().Replace('/', '_') + ".txt";
               if (!File.Exists(filepath))
               {
                    //Create a file to write to
                    using (StreamWriter sw = File.CreateText(filepath))
                    {
                         sw.WriteLine(Message);
                    }
               }
          }
     }
}

原剧本：

$HOSTNAME=hostname
$RXKEY="bandwidth_rx_trap"
$TXKEY="bandwidth_tx_trap"

$ifIndex = Get-WmiObject -Class win32_ip4routetable | where {$_.destination -eq "0.0.0.0"} | select -ExpandProperty InterfaceIndex | select -First 1
$ifIndex = "InterfaceIndex=" + $ifIndex
$nic_name = Get-WmiObject -Class win32_networkadapterconfiguration -Filter $ifIndex | select -ExpandProperty Description
$nic = [System.Net.NetworkInformation.Networkinterface]::GetAllNetworkInterfaces() | where {($_.description -eq $nic_name) -and ($_.operationalstatus -eq "up")}


for ($i=1; $i -le 5; $i++){
   $bytesSent = 0
   $bytesReceived = 0
   $stats = $nic.GetIPv4Statistics()
   $bytesSent = $stats.BytesSent
   $bytesReceived = $stats.BytesReceived
   $bytesSentSum = $bytesSentSum + $bytesSent
   $bytesReceivedSum = $bytesReceivedSum + $bytesReceived
   Start-Sleep 1
}

$TXAVG=[math]::round($bytesSentSum/5/1024,0)
$RXAVG=[math]::round($bytesReceivedSum/5/1024,0)

Answer 1

如果您想从

InterfaceIndex

中提取第一个

win32_ip4routetable

，您应该使用

Invoke<T>()

重载，然后该方法会输出

Collection<T>

，以便您可以

FirstOrDefault()

它。总结一下：

using (PowerShell psInstance = PowerShell.Create())
{
    int int_index = psInstance
        .AddScript(@"
            Get-CimInstance -Class win32_ip4routetable |
                Where-Object { $_.Destination -eq '0.0.0.0' } |
                Select-Object -ExpandProperty InterfaceIndex -First 1")
        .Invoke<int>()
        .FirstOrDefault();

    using (StreamWriter writer = new StreamWriter(auditFilePath, true))
    {
        writer.WriteLine(
            $"Execution Time: {DateTime.Now} Launched Bandwidth Trap...{int_index}");
    }
}