C# .NET项目中如何等待已启动的高权限PowerShell进程退出？

我在C#中编写了如下函数：

public static void RunPowerShellScriptFromElevatedPowerShell(string strPowerShellScriptFileName)
{
    Console.WriteLine($"Running powershell script from elevation: {strPowerShellScriptFileName}");

    string strCallPowerShellCommand = "powershell.exe";
    string command = $"-ExecutionPolicy Bypass -File {CDataAccess.Instance.ReadLocalParam(CDataAccess.ELocalParamList.E_SCRIPT_REPO_PATH)}\\{strPowerShellScriptFileName} {CDataAccess.Instance.ReadLocalParam(CDataAccess.ELocalParamList.E_SCRIPT_REPO_PATH)}";
    Process process = Process.Start("powershell", $"cd '{CDataAccess.Instance.ReadLocalParam(CDataAccess.ELocalParamList.E_MANIFEST_REPO_PATH)}';Start-Process {strCallPowerShellCommand} '{command}' -Verb runAs");

    process.WaitForExit();
}

运行该函数时，尽管PowerShell脚本仍在运行，代码却继续执行。如何修改才能让代码等待高权限PowerShell实例关闭后再继续？

注：我认为这并非《How to tell PowerShell to wait for each command to end before starting the next?》的重复问题，因为该问题及我在StackOverflow找到的其他相关问题均未涉及高权限Shell场景，而本次场景为高权限，存在差异。我已知晓这些问题，但它们无法解决我的需求，恳请不要标记为重复问题。

解决方案 #

你的代码核心问题是：Process.Start启动的是普通权限的PowerShell进程，这个进程仅执行Start-Process启动高权限实例后就直接退出了，所以WaitForExit()等待的是这个普通权限进程，而非你实际需要等待的高权限PowerShell实例。

方案一：给Start-Process添加-Wait参数 #

让中间的普通权限PowerShell进程等待高权限实例关闭后再退出，这样C#代码就能正确等待到目标进程结束：

public static void RunPowerShellScriptFromElevatedPowerShell(string strPowerShellScriptFileName)
{
    Console.WriteLine($"Running powershell script from elevation: {strPowerShellScriptFileName}");

    string scriptRepoPath = CDataAccess.Instance.ReadLocalParam(CDataAccess.ELocalParamList.E_SCRIPT_REPO_PATH);
    string manifestRepoPath = CDataAccess.Instance.ReadLocalParam(CDataAccess.ELocalParamList.E_MANIFEST_REPO_PATH);
    string strCallPowerShellCommand = "powershell.exe";
    // 给路径添加引号，避免路径含空格时出错
    string command = $"-ExecutionPolicy Bypass -File \"{scriptRepoPath}\\{strPowerShellScriptFileName}\" \"{scriptRepoPath}\"";
    
    // 给Start-Process添加-Wait参数，强制等待高权限进程结束
    Process process = Process.Start("powershell", $"cd '{manifestRepoPath}';Start-Process {strCallPowerShellCommand} -ArgumentList '{command}' -Verb runAs -Wait");

    process.WaitForExit();
}

方案二：直接在C#中启动高权限PowerShell（更简洁） #

跳过中间的普通权限PowerShell进程，直接用C#的ProcessStartInfo配置高权限启动：

using System.Diagnostics;
using System.IO;

public static void RunPowerShellScriptFromElevatedPowerShell(string strPowerShellScriptFileName)
{
    Console.WriteLine($"Running powershell script from elevation: {strPowerShellScriptFileName}");

    string scriptRepoPath = CDataAccess.Instance.ReadLocalParam(CDataAccess.ELocalParamList.E_SCRIPT_REPO_PATH);
    string manifestRepoPath = CDataAccess.Instance.ReadLocalParam(CDataAccess.ELocalParamList.E_MANIFEST_REPO_PATH);
    string fullScriptPath = Path.Combine(scriptRepoPath, strPowerShellScriptFileName);
    string arguments = $"-ExecutionPolicy Bypass -File \"{fullScriptPath}\" \"{scriptRepoPath}\"";

    ProcessStartInfo startInfo = new ProcessStartInfo("powershell.exe", arguments)
    {
        Verb = "runAs", // 启用高权限
        WorkingDirectory = manifestRepoPath,
        UseShellExecute = true // 必须设为true，否则Verb参数无效
    };

    Process process = Process.Start(startInfo);
    process.WaitForExit();
}

内容的提问来源于stack exchange，提问作者Eyal Gerber