Question

我有一个C＃函数来运行远程Powershell脚本。我可以看到脚本正在运行，并且在远程服务器上运行良好，但我无法从Powershell获得任何实时输出。
ps1脚本运行很长时间并且有很多输出。该脚本正在运行rar.exe，因此输出应该来自rar.exe。

这是C＃函数：

public static bool RunBackupPowershell()
    {
        string password = "somepassword";
        string userName = "someuser";
        string shell = "http://schemas.microsoft.com/powershell/Microsoft.PowerShell";
        var target = new Uri("http://someserver:5985/wsman");
        SecureString securepassword = String2SecureString(password);
        PSCredential credential = new PSCredential(userName, securepassword);
        WSManConnectionInfo connectionInfo = new WSManConnectionInfo(target,shell,credential);
        connectionInfo.OpenTimeout = 4 * 60 * 1000;
        connectionInfo.OpenTimeout = 1 * 60 * 1000;
        connectionInfo.AuthenticationMechanism = AuthenticationMechanism.Credssp;

        Runspace remote = RunspaceFactory.CreateRunspace(connectionInfo);

        remote.Open();
        PowerShell PowerShellInstance = PowerShell.Create();
        PowerShellInstance.Runspace = remote;
        PowerShellInstance.AddScript("D:\\backup\\test.ps1");

        PSDataCollection<PSObject> outputCollection = new PSDataCollection<PSObject>();
        outputCollection.DataAdded += outputCollection_DataAdded;
        PowerShellInstance.Streams.Error.DataAdded += Error_DataAdded;
        IAsyncResult result = PowerShellInstance.BeginInvoke<PSObject, PSObject>(null, outputCollection);

        while (result.IsCompleted == false)
        {
            hubs.Clients.All.SendPowerShellResults("Waiting for pipeline to finish...");

            Thread.Sleep(1000);
        }

        hubs.Clients.All.SendPowerShellResults("Execution has stopped. The pipeline state: " + PowerShellInstance.InvocationStateInfo.State);

        foreach (PSObject outputItem in outputCollection)
        {
            hubs.Clients.All.SendPowerShellResults(outputItem);
        }
        return true;

    }

   static void outputCollection_DataAdded(object sender, DataAddedEventArgs e)
    {
        hubs.Clients.All.SendPowerShellResults("Object added to output."+e);
    }
    static void Error_DataAdded(object sender, DataAddedEventArgs e)
    {
        hubs.Clients.All.SendPowerShellResults("An error was written to the Error stream!"+e);
    }

hubs.Clients.All.SendPowerShellResults函数是一个websocket，它正在工作 - 所以我可以接收数据，但它不是来自Powershell输出的数据。

我想知道这里发生了什么。

Answer 1

检查该主题是否有帮助：

Get Powershell command's output when invoked through code

流包含一个“ PsDataCollection”类型，每个项目都包含我们所需的输出。此类型包含“ DateAdded”事件。您可以使用DateAdded事件在添加数据后立即输出数据！

https://docs.microsoft.com/en-us/dotnet/api/system.management.automation.psdatacollection-1.dataadded?view=pscore-6.2.0

Answer 2

我遇到了类似的问题，因此创建了下面的示例，以允许使用异步枚举实时检索结果以从 PowerShell 管道中获取结果。

https://gist.github.com/OnKey/83cf98e6adafe5a2b4aaf561b138087b

static async Task Main(string[] args)
        {
            var script = @"
For ($i=0; $i -le 5; $i++) {
    $i
    Start-Sleep -s 1 
}
";
            var p = new Program();
            await foreach (var item in p.PowerShellAsyncEnumerable(script))
            {
                Console.WriteLine(item);
            }
        }

        private IAsyncEnumerable<PSObject> PowerShellAsyncEnumerable(string script)
        {
            var rs = RunspaceFactory.CreateRunspace();
            rs.Open();
            var pipeline = rs.CreatePipeline();
            pipeline.Commands.AddScript(script);

            return new PsAsyncEnumerable(pipeline);
        }

        internal class PsAsyncEnumerable : IAsyncEnumerable<PSObject>
        {
            private readonly Pipeline pipe;
            public PsAsyncEnumerable(Pipeline pipe) => this.pipe = pipe;

            public IAsyncEnumerator<PSObject> GetAsyncEnumerator(CancellationToken cancellationToken = new()) 
                => new PsAsyncEnumerator(this.pipe);
        }

        internal class PsAsyncEnumerator : IAsyncEnumerator<PSObject>
        {
            private readonly Pipeline pipe;
            private TaskCompletionSource dataReady = new();

            public PsAsyncEnumerator(Pipeline pipe)
            {
                this.pipe = pipe;
                this.pipe.Output.DataReady += NotificationHandler;
                this.pipe.Error.DataReady += NotificationHandler;
                this.pipe.InvokeAsync();
            }
            
            private void NotificationHandler(object sender, EventArgs e)
            {
                this.dataReady.SetResult();
            }
            
            public ValueTask DisposeAsync()
            {
                this.pipe.Dispose();
                return ValueTask.CompletedTask;
            }

            public async ValueTask<bool> MoveNextAsync()
            {
                while (!this.pipe.Output.EndOfPipeline)
                {
                    var item = this.pipe.Output.NonBlockingRead(1).FirstOrDefault();
                    if (item != null)
                    {
                        this.Current = item;
                        return true;
                    }
                
                    await this.dataReady.Task;
                    this.dataReady = new TaskCompletionSource();
                }

                return false;
            }

            public PSObject Current { get; private set; }
        }

C＃获取实时PowerShell脚本输出

2 个答案: