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Ukázka Runspace09

  • Článek

Tato ukázka ukazuje, jak přidat skript do kanálu System.Management.Automation.PowerShell objektu a jak skript spustit asynchronně. Události se používají ke zpracování výstupu skriptu.

Požadavky

Tato ukázka vyžaduje Prostředí Windows PowerShell 2.0.

Demonstruje

Tato ukázka ukazuje následující:

Příklad

Tato ukázka spustí skript, který vygeneruje čísla od 1 do 10 se zpožděním mezi jednotlivými čísly. Skript se spouští asynchronně a události se používají ke zpracování výstupu.

namespace Microsoft.Samples.PowerShell.Runspaces
{
  using System;
  using System.Collections.Generic;
  using System.Collections.ObjectModel;
  using System.Diagnostics;
  using System.Management.Automation;
  using System.Management.Automation.Runspaces;
  using PowerShell = System.Management.Automation.PowerShell;

  /// <summary>
  /// This class contains the Main entry point for this host application.
  /// </summary>
  internal class Runspace09
  {
    /// <summary>
    /// This sample shows how to use a PowerShell object to run a
    /// script that generates the numbers from 1 to 10 with delays
    /// between each number. The pipeline of the PowerShell object
    /// is run asynchronously and events are used to handle the output.
    /// </summary>
    /// <param name="args">The parameter is not used.</param>
    /// <remarks>
    /// This sample demonstrates the following:
    /// 1. Creating a PowerShell object.
    /// 2. Adding a script to the pipeline of the PowerShell object.
    /// 3. Using the BeginInvoke method to run the pipeline asynchronously.
    /// 4. Using the events of the PowerShell object to process the
    ///    output of the script.
    /// 5. Using the PowerShell.Stop() method to interrupt the invocation of
    ///    the pipeline.
    /// </remarks>
    private static void Main(string[] args)
    {
      Console.WriteLine("Print the numbers from 1 to 10. Hit any key to halt processing\n");

      using (PowerShell powershell = PowerShell.Create())
      {
        // Add a script to the PowerShell object. The script generates the
        // numbers from 1 to 10 in half second intervals.
        powershell.AddScript("1..10 | foreach {$_ ; Start-Sleep -Milli 500}");

        // Add the event handlers.  If we did not care about hooking the DataAdded
        // event, we would let BeginInvoke create the output stream for us.
        PSDataCollection<PSObject> output = new PSDataCollection<PSObject>();
        output.DataAdded += new EventHandler<DataAddedEventArgs>(Output_DataAdded);
        powershell.InvocationStateChanged += new EventHandler<PSInvocationStateChangedEventArgs>(Powershell_InvocationStateChanged);

        // Invoke the pipeline asynchronously.
        IAsyncResult asyncResult = powershell.BeginInvoke<PSObject, PSObject>(null, output);

        // Wait for things to happen. If the user hits a key before the
        // script has completed, then call the PowerShell Stop() method
        // to halt processing.
        Console.ReadKey();
        if (powershell.InvocationStateInfo.State != PSInvocationState.Completed)
        {
          // Stop the invocation of the pipeline.
          Console.WriteLine("\nStopping the pipeline!\n");
          powershell.Stop();

          // Wait for the Windows PowerShell state change messages to be displayed.
          System.Threading.Thread.Sleep(500);
          Console.WriteLine("\nPress a key to exit");
          Console.ReadKey();
        }
      }
    }

    /// <summary>
    /// The output data added event handler. This event is called when
    /// data is added to the output pipe. It reads the data that is
    /// available and displays it on the console.
    /// </summary>
    /// <param name="sender">The output pipe this event is associated with.</param>
    /// <param name="e">Parameter is not used.</param>
    private static void Output_DataAdded(object sender, DataAddedEventArgs e)
    {
      PSDataCollection<PSObject> myp = (PSDataCollection<PSObject>)sender;

      Collection<PSObject> results = myp.ReadAll();
      foreach (PSObject result in results)
      {
        Console.WriteLine(result.ToString());
      }
    }

    /// <summary>
    /// This event handler is called when the pipeline state is changed.
    /// If the state change is to Completed, the handler issues a message
    /// asking the user to exit the program.
    /// </summary>
    /// <param name="sender">This parameter is not used.</param>
    /// <param name="e">The PowerShell state information.</param>
    private static void Powershell_InvocationStateChanged(object sender, PSInvocationStateChangedEventArgs e)
    {
      Console.WriteLine("PowerShell object state changed: state: {0}\n", e.InvocationStateInfo.State);
      if (e.InvocationStateInfo.State == PSInvocationState.Completed)
      {
        Console.WriteLine("Processing completed, press a key to exit!");
      }
    }
  }
}

Viz také

psaní hostitelské aplikace Windows PowerShellu