如何从 C# 中的 Powershell 脚本读取 Write-Host 输出

Question

在 Powershell 中运行脚本时，我能够接收 Write-Host 输出，但在 C# 中则无法接收。
以下是输出 Write-Host“HELLO WORLD TEST”的代码。
当应用程序到达此行时失败：
Collection<PSObject> results = pipeline.Invoke();
我收到此错误消息：

HostException：由于宿主程序或命令类型不支持用户交互而提示用户失败的命令。尝试使用支持用户交互的主机程序（例如 Windows PowerShell 控制台或 Windows PowerShell ISE），并从不支持用户交互的命令类型（例如 Windows PowerShell 工作流）中删除与提示相关的命令

如何返回 Write-Host 的输出？提前致谢。

protected void Page_Load(object sender, EventArgs e) {

    if (!IsPostBack) {
        RunScript(@"C:\TestScript.ps1");
    }
}

private string RunScript(string scriptText) {

    Runspace runspace = RunspaceFactory.CreateRunspace();

    runspace.Open();

    Pipeline pipeline = runspace.CreatePipeline();
    pipeline.Commands.AddScript(scriptText);

    pipeline.Commands.Add("Out-String");

    Collection < PSObject > results = pipeline.Invoke();

    runspace.Close();

    StringBuilder stringBuilder = new StringBuilder();
    foreach(PSObject obj in results) {
        //do something
    }
    return Textbox.Text;
}

Answer 1

您可以像这样使用 PowerShell。创建一个实例并为您感兴趣的所有 Powershell 流添加侦听器：

private string RunScript(string scriptText)
{


    System.Management.Automation.PowerShell powerShellInstance = System.Management.Automation.PowerShell.Create();

powerShellInstance.Streams.Information.DataAdded += InformationHandler;

    powerShellInstance.Streams.Verbose.DataAdded += InformationalRecordEventHandler<VerboseRecord>;

    powerShellInstance.Streams.Debug.DataAdded += InformationalRecordEventHandler<DebugRecord>;

    powerShellInstance.Streams.Warning.DataAdded += InformationalRecordEventHandler<WarningRecord>;

    powerShellInstance.AddScript(scriptText);
                        powerShellInstance.Invoke();               
}

 static void InformationalRecordEventHandler<T>(object sender, DataAddedEventArgs e) 
        where T : InformationalRecord
    {
        var newRecord = ((PSDataCollection<T>)sender)[e.Index];
        if (!string.IsNullOrEmpty(newRecord.Message))
        {
            //STORE your message somewhere
        }
    }

static void InformationHandler(object sender, DataAddedEventArgs e)
    {
        var newRecord = ((PSDataCollection<InformationRecord>)sender)[e.Index];
        if (newRecord?.MessageData != null)
        {
            //STORE your message somewhere
        }
    }