Runspace04 – exempel

Det här exemplet visar hur du använder klassen System.Management.Automation.Powershell för att köra kommandon och hur du fångar avslutande fel som uppstår när kommandona körs. Två kommandon körs och det sista kommandot skickas ett parameterargument som inte är giltigt. Därför returneras inga objekt och ett avslutande fel returneras.

Krav

Det här exemplet kräver Windows PowerShell 2.0.

Demonstrationer

Det här exemplet visar följande.

Exempel

Det här exemplet kör kommandon synkront i standardkörningsutrymmet som tillhandahålls av Windows PowerShell. Det sista kommandot kastar ett avslutande fel eftersom ett parameterargument som inte är giltigt skickas till kommandot. Det avslutande felet är fångat och visas.

namespace Microsoft.Samples.PowerShell.Runspaces
{
  using System;
  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 Runspace04
  {
    /// <summary>
    /// This sample shows how to use a PowerShell object to run commands.
    /// The commands generate a terminating exception that the caller
    /// should catch and process.
    /// </summary>
    /// <param name="args">The parameter is not used.</param>
    /// <remarks>
    /// This sample demonstrates the following:
    /// 1. Creating a PowerShell object to run commands.
    /// 2. Adding commands to the pipeline of  the PowerShell object.
    /// 3. Passing input objects to the commands from the calling program.
    /// 4. Using PSObject objects to extract and display properties from the
    ///    objects returned by the commands.
    /// 5. Retrieving and displaying error records that were generated
    ///    while running the commands.
    /// 6. Catching and displaying terminating exceptions generated
    ///    while running the commands.
    /// </remarks>
    private static void Main(string[] args)
    {
      // Create a PowerShell object.
      using (PowerShell powershell = PowerShell.Create())
      {
        // Add the commands to the PowerShell object.
        powershell.AddCommand("Get-ChildItem").AddCommand("Select-String").AddArgument("*");

        // Run the commands synchronously. Because of the bad regular expression,
        // no objects will be returned. Instead, an exception will be thrown.
        try
        {
          foreach (PSObject result in powershell.Invoke())
          {
            Console.WriteLine("'{0}'", result.ToString());
          }

          // Process any error records that were generated while running the commands.
          Console.WriteLine("\nThe following non-terminating errors occurred:\n");
          PSDataCollection<ErrorRecord> errors = powershell.Streams.Error;
          if (errors != null && errors.Count > 0)
          {
            foreach (ErrorRecord err in errors)
            {
              System.Console.WriteLine("    error: {0}", err.ToString());
            }
          }
        }
        catch (RuntimeException runtimeException)
        {
          // Trap any exception generated by the commands. These exceptions
          // will all be derived from the RuntimeException exception.
          System.Console.WriteLine(
                        "Runtime exception: {0}: {1}\n{2}",
                        runtimeException.ErrorRecord.InvocationInfo.InvocationName,
                        runtimeException.Message,
                        runtimeException.ErrorRecord.InvocationInfo.PositionMessage);
        }
      }

      System.Console.WriteLine("\nHit any key to exit...");
      System.Console.ReadKey();
    }
  }
}

Se även

Skriva ett Windows PowerShell-värdprogram