Voorbeeld StopProcessSample03
In dit voorbeeld ziet u hoe u een cmdlet schrijft waarvan de parameters aliassen hebben en waarvan de parameters jokertekens ondersteunen. Deze cmdlet is vergelijkbaar met de Stop-Process cmdlet van Windows PowerShell 2.0.
Het voorbeeld bouwen met behulp van Visual Studio.
Als de Windows PowerShell 2.0 SDK is geïnstalleerd, gaat u naar de map StopProcessSample03. De standaardlocatie is C:\Program Files (x86)\Microsoft SDK's\Windows\v7.0\Samples\sysmgmt\WindowsPowerShell\csharp\StopProcessSample03.
Dubbelklik op het pictogram voor het oplossingsbestand (.sln). Hiermee opent u het voorbeeldproject in Microsoft Visual Studio.
Selecteer in het menu Bouwen de optie Oplossing bouwen.
De bibliotheek voor het voorbeeld wordt gebouwd in de standaardmappen \bin of \bin\debug.
Het voorbeeld uitvoeren
Maak de volgende modulemap:
[user]/documents/windowspowershell/modules/StopProcessSample03Kopieer de voorbeeldassemblage naar de modulemap.
Start Windows PowerShell.
Voer de volgende opdracht uit om de assembly in de volgende Windows PowerShell:
import-module stopprossessample03Voer de volgende opdracht uit om de cmdlet uit te voeren:
stop-proc
Vereisten
Voor dit voorbeeld is Windows PowerShell 2.0 vereist.
Demonstreert
In dit voorbeeld wordt het volgende gedemonstreerd.
Het declareren van een cmdlet-klasse met behulp van het kenmerk Cmdlet.
Het declareren van een cmdlet-parameters met behulp van het kenmerk Parameter.
Aliassen toevoegen aan parameterdeclaraties..
Ondersteuning voor jokertekens toevoegen aan parameters.
Voorbeeld
In dit voorbeeld ziet u hoe u parameteraliassen declareer en jokertekens ondersteunt.
using System;
using System.Diagnostics;
using System.Collections;
using Win32Exception = System.ComponentModel.Win32Exception;
using System.Management.Automation; //Windows PowerShell namespace
using System.Globalization;
namespace Microsoft.Samples.PowerShell.Commands
{
#region StopProcCommand
/// <summary>
/// This class implements the stop-proc cmdlet.
/// </summary>
[Cmdlet(VerbsLifecycle.Stop, "Proc",
SupportsShouldProcess = true)]
public class StopProcCommand : Cmdlet
{
#region Parameters
/// <summary>
/// This parameter provides the list of process names on
/// which the Stop-Proc cmdlet will work.
/// </summary>
[Parameter(
Position = 0,
Mandatory = true,
ValueFromPipeline = true,
ValueFromPipelineByPropertyName = true,
HelpMessage = "The name of one or more processes to stop. Wildcards are permitted."
)]
[Alias("ProcessName")]
public string[] Name
{
get { return processNames; }
set { processNames = value; }
}
private string[] processNames;
/// <summary>
/// This parameter overrides the ShouldContinue call to force
/// the cmdlet to stop its operation. This parameter should always
/// be used with caution.
/// </summary>
[Parameter]
public SwitchParameter Force
{
get { return force; }
set { force = value; }
}
private bool force;
/// <summary>
/// This parameter indicates that the cmdlet should return
/// an object to the pipeline after the processing has been
/// completed.
/// </summary>
[Parameter(
ValueFromPipelineByPropertyName = true,
HelpMessage = "If set, the process(es) will be passed to the pipeline after stopped."
)]
public SwitchParameter PassThru
{
get { return passThru; }
set { passThru = value; }
}
private bool passThru;
#endregion Parameters
#region Cmdlet Overrides
/// <summary>
/// The ProcessRecord method does the following for each of the
/// requested process names:
/// 1) Check that the process is not a critical process.
/// 2) Attempt to stop that process.
/// If no process is requested then nothing occurs.
/// </summary>
protected override void ProcessRecord()
{
Process[] processes = null;
try
{
processes = Process.GetProcesses();
}
catch (InvalidOperationException ioe)
{
base.ThrowTerminatingError(new ErrorRecord(ioe,
"UnableToAccessProcessList",
ErrorCategory.InvalidOperation,
null));
}
// For every process name passed to the cmdlet, get the associated
// processes.
// Write a nonterminating error for failure to retrieve
// a process.
foreach (string name in processNames)
{
// Write a user-friendly verbose message to the pipeline. These
// messages are intended to give the user detailed information
// on the operations performed by the cmdlet. These messages will
// appear with the -Verbose option.
string message = String.Format(CultureInfo.CurrentCulture,
"Attempting to stop process \"{0}\".", name);
WriteVerbose(message);
// Validate the process name against a wildcard pattern.
// If the name does not contain any wildcard patterns, it
// will be treated as an exact match.
WildcardOptions options = WildcardOptions.IgnoreCase |
WildcardOptions.Compiled;
WildcardPattern wildcard = new WildcardPattern(name,options);
foreach (Process process in processes)
{
string processName;
try
{
processName = process.ProcessName;
}
catch (Win32Exception e)
{
WriteError(new ErrorRecord(
e, "ProcessNameNotFound",
ErrorCategory.ObjectNotFound,
process)
);
continue;
}
// Write a debug message to the host that can be used when
// troubleshooting a problem. All debug messages will appear
// with the -Debug option.
message = String.Format(CultureInfo.CurrentCulture,
"Acquired name for pid {0} : \"{1}\"",
process.Id, processName);
WriteDebug(message);
// Check to see if this process matches the current process
// name pattern. Skip this process if it does not.
if (!wildcard.IsMatch(processName))
{
continue;
}
// Stop the process.
SafeStopProcess(process);
} // foreach (Process...
} // foreach (string...
} // ProcessRecord
#endregion Cmdlet Overrides
#region Helper Methods
/// <summary>
/// Safely stops a named process. Used as standalone function
/// to declutter the ProcessRecord method.
/// </summary>
/// <param name="process">The process to stop.</param>
private void SafeStopProcess(Process process)
{
string processName = null;
try
{
processName = process.ProcessName;
}
catch (Win32Exception e)
{
WriteError(new ErrorRecord(e, "ProcessNameNotFound",
ErrorCategory.ObjectNotFound, process));
return;
}
string message = null;
// Confirm the operation first.
// This is always false if the WhatIf parameter is specified.
if (!ShouldProcess(string.Format(CultureInfo.CurrentCulture,
"{0} ({1})", processName, process.Id)))
{
return;
}
// Make sure that the user really wants to stop a critical
// process that could possibly stop the computer.
bool criticalProcess = criticalProcessNames.Contains(processName.ToLower(CultureInfo.CurrentCulture));
if (criticalProcess && !force)
{
message = String.Format(CultureInfo.CurrentCulture,
"The process \"{0}\" is a critical process and should not be stopped. Are you sure you wish to stop the process?",
processName);
// It is possible that ProcessRecord is called multiple
// when objects are received as inputs from a pipeline.
// So, to retain YesToAll and NoToAll input that the
// user may enter across multiple calls to this
// function, they are stored as private members of the
// Cmdlet.
if (!ShouldContinue(message, "Warning!",
ref yesToAll, ref noToAll))
{
return;
}
} // if (criticalProcess...
// Display a warning message if stopping a critical
// process.
if (criticalProcess)
{
message = String.Format(CultureInfo.CurrentCulture,
"Stopping the critical process \"{0}\".",
processName);
WriteWarning(message);
} // if (criticalProcess...
try
{
// Stop the process.
process.Kill();
}
catch (Exception e)
{
if ((e is Win32Exception) || (e is SystemException) ||
(e is InvalidOperationException))
{
// This process could not be stopped so write
// a non-terminating error.
WriteError(new ErrorRecord(e, "CouldNotStopProcess",
ErrorCategory.CloseError,
process)
);
return;
} // if ((e is...
else throw;
} // catch
message = String.Format(CultureInfo.CurrentCulture,
"Stopped process \"{0}\", pid {1}.",
processName, process.Id);
WriteVerbose(message);
// If the PassThru parameter is specified,
// return the terminated process to the pipeline.
if (passThru)
{
message = String.Format(CultureInfo.CurrentCulture,
"Writing process \"{0}\" to pipeline",
processName);
WriteDebug(message);
WriteObject(process);
} // if (passThru...
} // SafeStopProcess
#endregion Helper Methods
#region Private Data
private bool yesToAll, noToAll;
/// <summary>
/// Partial list of the critical processes that should not be
/// stopped. Lower case is used for case insensitive matching.
/// </summary>
private ArrayList criticalProcessNames = new ArrayList(
new string[] { "system", "winlogon", "spoolsv" }
);
#endregion Private Data
} // StopProcCommand
#endregion StopProcCommand
} // namespace Microsoft.Samples.PowerShell.Commands
Zie ook
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